Academic literature on the topic 'Complex geotechnical conditions'
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Journal articles on the topic "Complex geotechnical conditions"
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Elmouttie, Marc, Jane Hodgkinson, and Peter Dean. "Prediction of Mining Conditions in Geotechnically Complex Sites." Mining 1, no. 3 (2021): 279–96. http://dx.doi.org/10.3390/mining1030018.
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Geotechnical complexity in mining often leads to geotechnical uncertainty which impacts both safety and productivity. However, as mining progresses, particularly for strip mining operations, a body of knowledge is acquired which reduces this uncertainty and can potentially be used by mining engineers to improve the prediction of future mining conditions. In this paper, we describe a new method to support this approach based on modelling and neural networks. A high-level causal model of the mining operations based on historical data for a number of parameters was constructed which accounted for parameter interactions, including hydrogeological conditions, weather, and prior operations. An artificial neural network was then trained on this historical data, including production data. The network can then be used to predict future production based on presently observed mining conditions as mining proceeds and compared with the model predictions. Agreement with the predictions indicates confidence that the neural network predictions are properly supported by the newly available data. The efficacy of this approach is demonstrated using semi-synthetic data based on an actual mine.
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Xiaolei, Yin. "Case study of geotechnical engineering investigation under complex geological conditions." Advance in Civil Engineering 2, no. 1 (2020): 26–31. http://dx.doi.org/10.35534/ace.0201005c.
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Benin, Andrey V., and Elena V. Gorodnova. "Geotechnical Analysis of Structural Behaviour Under Complex Geological Engineering Conditions." Procedia Engineering 189 (2017): 65–69. http://dx.doi.org/10.1016/j.proeng.2017.05.011.
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Zotsenko, M. L., Yu L. Vynnykov, М. O. Kharchenko, and І. I. Lartseva. "DESIGN PECULIARITIES OF OIL STORAGE TANKS IN COMPLEX GEOTECHNICAL CONDITIONS AT SEISMIC EFFECTS." ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 1, no. 48 (2017): 175–82. http://dx.doi.org/10.26906/znp.2017.48.795.
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Problematic issues of construction and operation of oil storage vertical steel tanks in complex geotechnical conditions, including the seismically unstable territories are systematized. The technique of seismic danger decreasing (increasing the seismic stability of the ground) for ensuring the accident-free operation of tanks during earthquakes of various intensities is proved.
 The practical experience of design solutions of the highly effective systems «man-made grounds – foundation – tank» in complex geotechnical conditions for static and dynamic effects (earthquakes, emergency technogenic loadings, etc.) is given.
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Gao, Yan, Guihe Liang, and Yanyong Zhou. "Exploration of Geotechnical Engineering Investigation under Complex Topographical and Geological Conditions." Frontiers Research of Architecture and Engineering 2, no. 4 (2019): 20. http://dx.doi.org/10.30564/frae.v2i4.1512.
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This paper will explore the geotechnical engineering investigation technology under the complex topographical and geological conditions, and introduce how to construct the water supply tube wells faster and better under the complex topographical and geological conditions by taking Inner Mongolia as an example, so as to provide reference for the relevant professionals
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MULABDIĆ, Mensur, Krunoslav MINAŽEK, Marija LEKO-KOS, Želimir ORTOLAN, Jelena KALUÐER, and Jelena MATIJEVIĆ. "A case of complex geotechnical conditions for a water treatment facility." ce/papers 2, no. 2-3 (2018): 719–24. http://dx.doi.org/10.1002/cepa.755.
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Vinod, J. S. "Dem Simulations in Geotechnical Earthquake Engineering Education." International Journal of Geotechnical Earthquake Engineering 1, no. 1 (2010): 61–69. http://dx.doi.org/10.4018/jgee.2010090804.
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Behaviour of geotechnical material is very complex. Most of the theoretical frame work to understand the behaviour of geotechnical materials under different loading conditions depends on the strong background of the basic civil engineering subjects and advanced mathematics. However, it is fact that the complete behaviour of geotechnical material cannot be traced within theoretical framework. Recently, computational models based on Finite Element Method (FEM) are used to understand the behaviour of geotechnical problems. FEM models are quite complex and is of little interest to undergraduate students. A simple computational tool developed using Discrete Element Method (DEM) to simulate the laboratory experiments will be cutting edge research for geotechnical earthquake engineering education. This article summarizes the potential of DEM to simulate the cyclic triaxial behaviour of granular materials under complex loading conditions. It is shown that DEM is capable of simulating the cyclic behavior of granular materials (e.g. undrained, liquefaction and post liquefaction) similar to the laboratory experiments.
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Yu, Wei Wei, and Xuan Guo. "Ground Adaptability Characterization for Digging in Complex Geotechnical Conditions and Risk Mitigation." Advanced Materials Research 415-417 (December 2011): 1431–34. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.1431.
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Characterization of geotechnical digging and control the dynamical settlement is very necessary to mitigate construction risk. The metro tunnels of being constructed access to each other or near to the ground is high risk and physically difficult and costly. The control method becomes imperative. Some cases of digging prediction of ground movements and assessment of risk of damage to above or adjacent constructions have become an important issue especially in urban projec. Ground adaptability characterization is the key of control the tunneling in complex geotechnical conditions both in rock and soft stratum. High and changed water-soil pressure also is risk factors to effect tunneling process. Beside discussion of risk mitigation associate to tunnel construction, the developing settlement control and simulations are given to describe the methods of control risk.
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Wang, Ge. "Research on the Method of Ground Stress Balance under Complex Conditions Based on Geometric Tracing." Advances in Civil Engineering 2022 (May 14, 2022): 1–8. http://dx.doi.org/10.1155/2022/9359268.
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The accuracy of the initial ground stress balance determines the accuracy of the finite element analysis of geotechnical problems. The traditional ground stress balance method has a good balance effect for simple geotechnical models but has strong limitations when the structure and soil interact with each other, the geometry of the model is complex, or the constraints are complicated. To deal with such problems, this paper proposes a general ground stress balance method based on geometric tracing by iteratively superimposing the static displacement field of the numerical model with the initial node coordinates of the numerical model. Two commonly used methods as well as the proposed method were tested with a model which contains both soil elements and structural elements and a case study. Test results show that the proposed method is capable of dealing with a complex model in which the commonly used methods fail to. Furthermore, the proposed ground stress balance method was demonstrated to be clear and has rapid convergence and high accuracy for complex stratum-structure geotechnical problems.
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Ivkovic, Mirko, and Mile Bugarin. "Technical solution of supporting the mining facilities in the complex geotechnical conditions." Rudarski radovi, Bor, no. 3 (2012): 287–94. http://dx.doi.org/10.5937/rudrad1203287i.
Full textDissertations / Theses on the topic "Complex geotechnical conditions"
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Karparov, Krassimir Nikolov. "Slope stability analyses in complex geotechnical conditions thrust failure mechanisms /." Pretoria : [s.n.], 2003. http://upetd.up.ac.za/thesis/available/etd-03092007-153601.
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Губашова, Валентина Євгенівна. "Обґрунтування раціональних технологічних параметрів струменевої цементації в складних геотехнічних умовах". Doctoral thesis, Київ, 2021. https://ela.kpi.ua/handle/123456789/40256.
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Дисертація присвячена обґрунтуванню раціональних технологічних параметрів струменевої цементації в складних геотехнічних умовах. В роботі досліджено та встановлено взаємозв’язки технологічних параметрів струменевої цементації з діаметром ґрунтоцементної колони в різних типах ґрунтів. На основі отриманих експоненціальних залежностей діаметра ґрунтоцементного елементу круглого перерізу від енергії високонапірного струменя цементного розчину розроблено методику розрахунку діаметра струменево-цементаційної колони. В процесі дослідження експериментальним шляхом доведено змінення фізико-механічних властивостей ґрунту, що оточує ґрунтоцементний елемент під час його виконання за струменевою технологією. На підставі математичного моделювання визначено закономірності формування в ґрунтових масивах зон з поліпшеними фізико-механічними параметрами в міжколонному просторі в різних типах ґрунтів. Удосконалено методику комп’ютерного моделювання управління напружено-деформованим станом основи будівлі під час її підсилення струменево-цементаційними елементами з урахуванням складних геотехнічних умов.
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Karparov, Krassimir Nikolov. "Slope stability analyses in complex Geotechnical conditions – Thurst failure mechanism." Thesis, 2007. http://hdl.handle.net/2263/23040.
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In this thesis a previously unknown mechanism of failure in multilayered slope profiles is identified. In some conditions this mechanism does not confirm to the known failure models (relating to circular failure) used in slope stability analysis. For this reason, major failures have occurred in the artificial cuts despite the fact that the limit equilibrium methods suggest that these cuts would be stable. The limit equilibrium methods were originally created to apply to earth dam walls. In the open pit mining environment, where we face inhomogeneous and inclined multilayered structures, the assumptions of these limit equilibrium methods appear to be inapplicable (e.g. assumption for the equal shear strength along the failure surface). Analysis starts with a general picture of the stress state in the highwall slope, given extant geological conditions and rock properties. The study then focuses on a comparison of the crack-tip stress changes in the rockmass with and without inclusions at the microscopic level. Basing some assumptions on binocular microscope observations of grain structures, it is possible to measure the size of the different inclusions and show that the microscopic carbon flakes present in the rock fabric make a major contribution to the failure process in a mudstone layer in the slope. The approach adopts the fracture-process zone ahead of a crack tip as the controlling parameter of flaw propagation in rock. Flaw coalescence, which is poorly accounted for in current fracture models, is attributable to two phenomena: the flaw propagation due to high level of applied stress; and the linking of fracture-process zones due to the small distance between neighbouring flaws. A condition of flaw coalescence is given based on these two mechanisms. This development allows defining of two zones along the failure surface (frictional and cohesive). In the slope-stability field the shear strength of the rock along the failure plane is a composite function of cohesive and frictional strength. For instance, the relaxation stress normal to bedding, induced by overburden removal, provides an investigation method for the determination of the weakest minerals, which may act as flaws for fracture propagation in low-porosity rock. A method has been developed to determine the critical stress for tensile fracture propagation due to the rock structure and the stress reduction normal to bedding. A proposed failure mechanism is based on the polygonal failure surfaces theory developed by Kovari and Fritz (1978), Boyd’s field observations (1983), Stead and Scoble’s (1983) analyses, Riedel (1929) Shear Fracture Model, Tchalenko and Ambraseys (1970), Gammond’s (1983) and Ortlepp (1997) observations for natural shear failures, computer modelling by McKinnon and de la Barra (1998), the results of many laboratory experiments reported by Bartlett et al. (1981) and the author’s experience. The proposed failure mechanism evaluates stability of the artificial slope profile due to the embedded weak layer structure, layer thickness, layer inclination and depth of the cut. On the basis of the observations and the above-mentioned modified fracture model, the slope profile is divided into two blocks; passive and active blocks. With this new model, it is possible to calculate slope safety factors for the slope failure cases studied in the industry. It has been found that, whereas the conventional slope stability models predict stable conditions, the new model suggests that the slope is only marginally stable (i.e. that failure can be expected).<br>Thesis (PhD(Mining Engineering))--University of Pretoria, 2007.<br>Mining Engineering<br>unrestricted
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(8842580), Osvaldo Paiva Maga Vitali. "TUNNEL BEHAVIOR UNDER COMPLEX ANISOTROPIC CONDITIONS." Thesis, 2020.
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Rock masses may present
remarked geostatic stress anisotropy and anisotropic material properties; thus,
the tunnel alignment with the geostatic principal stress directions and with
the axes of material anisotropy is unlikely. Nevertheless, tunnel design often
neglects those misalignments and; yet, the misalignment effects were unknown.
In this doctoral research, tunnels under complex anisotropic conditions were
modelled analytically and numerically with 3D nonlinear Finite Element Method
(FEM). When the tunnel misaligns with the geostatic principal stress
directions, anti-symmetric axial displacements and shear stresses are induced
around the tunnel. Analytical solutions for misaligned shallow and deep tunnels
in isotropic elastic ground are provided. The analytical solutions were
validated with 3D FEM analyses. Near the face, the anti-symmetric axial
displacements are partially constrained by the tunnel face, producing
asymmetric radial displacements and stresses. The asymmetric radial
displacements at the face can be divided into a rigid body displacement of the
tunnel cross-section and anti-symmetric radial displacements. Those asymmetries
may affect the rock-support interaction and the plastic zone developed around
the tunnel. In anisotropic rock masses, the tunnel misalignment with the axes
of material anisotropy also produces anti-symmetric axial displacements and
stresses around the tunnel. It occurs because when the tunnel is not aligned
with the principal material directions, the in-plane stresses are coupled with
the axial displacements (i.e. the compliance matrix is fully populated). Thus,
tunnels in anisotropic rock mass not aligned with the geostatic principal
stresses and with the axes of material anisotropy are substantially more
complex than tunnels not aligned with the principal stress directions in
isotropic rock mass. An analytical solution for misaligned tunnels in
anisotropic rock mass is provided. It was observed that the relative
orientation of the geostatic principal stresses with respect to the axes of
material anisotropy plays an important role. The axial displacements produced
by far-field axial shear stresses and by the rock mass anisotropy may
compensate each other; thus, axial and radial displacements around the tunnel
are reduced. On the other hand, those anti-symmetric axial displacements may be
amplified; thus, the ground deformations are increased. Asymmetric radial and
axial deformations, and asymmetric spalling of the tunnel walls are commonly
observed on tunnels in anisotropic rock masses. The tunnel misalignment with
the geostatic principal stress directions and with the axes of material
anisotropy could be associated with those phenomena that, so far, are not well
comprehended
Books on the topic "Complex geotechnical conditions"
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Gruzdev, Vladimir, Sergey Suslov, Vladimir Kosinskiy, and Mariya Hrustaleva. Changes in the composition and structure of the components of the landscapes of the forest zone in the conditions of technogenesis. INFRA-M Academic Publishing LLC., 2023. http://dx.doi.org/10.12737/1850657.
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The monograph is devoted to the analysis of changes in the structure of natural and agricultural landscapes under conditions of anthropogenic, including man-made, impact on landscapes. The author summarizes his own research conducted in the forest zone in the subzones of the middle and southern taiga and broad-leaved coniferous forests. The studies were carried out in forests, meadows and swamps, and also studied the formation of the quality of natural waters and the overgrowth of reservoirs in the forest zone. The composition and structure of zonal plant communities and the dynamic successional stages of secondary, derived communities formed in logging, burning, flooding by reservoirs, man-made pollution, as well as integrated anthropogenic impact are considered. Factors of technogenic transformation of landscapes are analyzed. The analysis of the complex of anthropogenic impacts has been carried out and the main trends of anthropogenic dynamics of soil and vegetation cover have been identified, recommendations for optimization and rationalization of nature management under anthropogenic impact are given. The issues of formation of geotechnical systems, their structure and issues of interaction in the system "man and nature" are considered.
 It is of interest to ecologists, geographers, biologists. It can be used in the work of state bodies for monitoring the state of the environment and in the educational process — by teachers and students dealing with ecology, nature management, biology, environmental monitoring, territory engineering, as well as by researchers, graduate students and applicants.
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Crespellani, Teresa, ed. Terremoto e ricerca. Firenze University Press, 2008. http://dx.doi.org/10.36253/978-88-8453-819-2.
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The profound cultural transformation that has taken place in Italian seismic studies in the last ten years is distinguished by the growing interest in the problem of assessing the effects of earthquakes linked to local conditions, and in the related issue of a precise definition of the properties of the soil in the sphere of the dynamic and cyclical stresses induced by seismic actions. Despite the profound awareness of the extent to which the nature of the soil contributes to the destructive effects of earthquakes, we are still a long way from the possibility of a realistic forecast of the seismic behaviour of the Italian soils. This is because the identification of the dynamic properties calls for experimental equipment that is technologically complex and costly as well as lengthy observation and qualified personnel. The rare experimental data that have been acquired to date hence represent a fundamental element for scientific reflection. This book has been conceived with a view to setting at the disposal of a broader public the results of the tests conducted on site and in the laboratory on the soil of certain significant seismic areas using the dynamic-type apparatus of the Geotechnical Laboratory of the Department of Civil and Environmental Engineering (DICeA) of the University of Florence. It presents a selection of the works of the Geotechnical section of the DICeA that have been published in various specialist international and national ambits. These studies were largely launched following the seismic sequence in Umbria and the Marches, in collaboration with several Regional Authorities and Research Institutes for the reduction of the seismic risk in Italy (GNDT, IRRS, INGV). In addition to the experimental techniques and the results obtained, the models and the geotechnical procedures adopted for assessing the effects of site and soil instability in certain specific deposits of the Italian territory are also expounded.
Book chapters on the topic "Complex geotechnical conditions"
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Hu, Yaoyao, Heng Cai, Ning Zhang, Mengtian Li, Shengtao Zhang, and Hanpeng Wang. "Key Technology and Equipment for Splitting and Grouting of Complex Geotechnical Bodies." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-97-7887-4_14.
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Abstract Due to the hidden nature and complexity of the underground engineering rock body, the actual grouting process is mostly a black box operation, which makes it difficult to observe and control the splitting direction of the slurry vein, and the slurry vein splitting is difficult to be expanded according to the expected direction and length, therefore, it is especially important to clarify the splitting law, start splitting and diffusion law of the slurry vein during the grouting process to study the directional control mechanism of the splitting grouting slurry vein. Therefore, an array type 27-channel multivariate data monitoring true triaxial split grouting simulation tester is developed independently, which includes four parts: true triaxial grouting test platform, triaxial loading unit, digital grouting unit and information acquisition unit, and the system can be used to carry out split grouting simulation tests under different geostress conditions, and to study the split diffusion law of the grouting veins in the complex soil body.
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Woldearegay, Kifle. "Characteristics of Landslides Affecting Road Networks in Ethiopia: Evidence from 25 Years Research, Practice and Documentation." In Progress in Landslide Research and Technology. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-72736-8_25.
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AbstractOver the last four decades, Ethiopia has been involved in massive road constructions which pass through complex geological, geotechnical, hydrological and terrain conditions of the country. The sustainability and functionality of these roads is, however, hugely affected by interrelated geohazards. This paper presents on the characteristics of landslides that have been affecting road networks in Ethiopia with data from research, practice and documentation over 25 years period (1997–2022). The study involved: (1) field inventory and characterization of 158 landslide-affected road sections, (2) investigations of the geological, geohydrological and geotechnical conditions, (3) monitoring groundwater levels and spring discharges, (4) measurement of flood levels of rivers/streams close to landslides, (5) in-situ and laboratory tests of the engineering properties of soils and rocks, (6) assessments on the association of the landslides with gully erosion, construction, and other factors, and (7) assessments on the performances of mitigation measures implemented. Results revealed that debris/earth slides are the dominant types of failures, with some debris/earth flows. Failures occurred in unconsolidated sediments with certain conditions: (a) concave terrains with slope angles 12°–38°, (b) variable depths of failures: maximum values 2.5–13.5 m, (c) shallow groundwater systems: water level fluctuated between 0 and 3.5 m below surface, and (d) active stream/river incisions at downslope sides of the roads. Broadly, the landslide-road-landscape interactions could be categorized into three: (a) failure of the upslope part of the road, (b) failure of the downslope part of the road, and (c) failure of the whole road section (upslope, road and downslope). Though different mitigation measures were implemented in 125 sites, the measures were unsuccessful in 70 sites (56%). In all the landslide-affected road sections, no comprehensive geological/geotechnical site investigations and slope stability analysis were carried out and the landslide-road-landscape interactions were poorly understood. With the expected increase in road/railway network development, limited capacity, climate change and fragile nature of the Ethiopian landscapes, landslides and associated problems are expected to pose major risks unless due attention is given to these interrelated geohazards. This calls for further collaborative research, innovations, and capacity building to address landslides and related geohazards in Ethiopia and in other developing countries with similar conditions.
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Chikhaoui, Mohamed, and Ammar Nechnech. "Poromechanical Behavior Analysis of an Underground Cavity Below Runways Under the Dynamic Cyclic Action of Landing Gear on Complex Geotechnical Conditions." In Sustainable Civil Infrastructures. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01884-9_6.
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Stoumpos, G., K. Boronkay, E. Zampiras, G. Rovolis, M. Novack, and N. Bousoulas. "Compilation of a Geotechnical Baseline Report (GBR) in complex ground conditions – The case of the new, under construction, line 4 of the Athens Metro." In Expanding Underground - Knowledge and Passion to Make a Positive Impact on the World. CRC Press, 2023. http://dx.doi.org/10.1201/9781003348030-419.
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Frodella, William, Daniele Spizzichino, Giacomo Lazzeri, Claudio Margottini, Veronica Tofani, and Nicola Casagli. "Assessing Landslide Hazard in the High City of Antananarivo, Madagascar (UNESCO Tentative Site)." In Progress in Landslide Research and Technology. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-44296-4_21.
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AbstractBuilt on the hilltop of a granite ridge rising above the Ikopa River valley (the Analamanga Hill), the High City of Antananarivo (Madagascar) is renowned for its baroque-style palaces the Rova royal complex and gothic cathedrals dating back to the nineteenth Century, and therefore is part of the UNESCO Tentative List. Due to the frequent cyclonic heavy cyclonic rain, geological and geomorphological conditions, and a general lack of urban planning the study area is particularly prone to landslides (as shown by events of the winter of 2015, 2018 and 2019). As a first step towards understanding quantitative landslide risk, the geological, geomorphological, geotechnical features, as well as landslide phenomena were defined in an integrated landslide hazard assessment. Results show that the main factors affecting landslides are slope, lithology, creek-gully erosion and anthropogenic activities, while most of the landslide events are clearly triggered by heavy rainfall events. Thematic maps produced by this study are fundamental land-use management tools to be applied as a first step towards a geo-hydrological risk reduction strategy by the institutions and actors involved in the protection and conservation of the High City.
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Zhanakova, R. K., and A. O. Sagybekova. "Investigation of combined support structures under complex geological conditions." In Smart Geotechnics for Smart Societies. CRC Press, 2023. http://dx.doi.org/10.1201/9781003299127-93.
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Ávila, Guillermo, and María Paula Ávila-Guzmán. "Lessons from the Great Gramalote: Colombia Landslide (2010) and its Relocation Process." In Progress in Landslide Research and Technology. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-72736-8_5.
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AbstractColombia is located in a tropical zone periodically affected by El Niño Southern Oscillation (ENSO), which in the wet phase is called La Niña, characterized by rain values over the historical average. The last important La Niña event occurred in 2010–2011 and produced generalized floods and many landslides around the country, with important human and material losses. One of the most significant landslides triggered in this period was the Gramalote landslide, which destroyed a town of 3000 people, located in the northeast of the country and made it necessary to evacuate all the population and construct a new village 3.5 km north of the affected site. This article presents a general framework of the 2010–2011 La Niña effects in Colombia as a main cause of the Gramalote Landslide, the description of the instability problem, considering the stages previous, during, and after the landslide, as well as a back data vulnerability analysis and a review regarding the relocation process and its results after more than 13 years of the landslide occurrence. Important lessons can be learned about this complex risk management process, as a) the geological and geotechnical conditions in which the landslide occurred and the identification of the main triggering factors, b) the necessity of confident technical information about the local risk condition that takes into account extreme climate events c) the importance of such information being known and understood by local authorities and the population, d) the difficulties that arise under massive evacuation when a detailed emergency plan is not available (no one expected that there would be a landslide of the magnitude that occurred, much less that they would have to permanently evacuate all the homes), e) the complexities associated to the selection of a new site for relocation, considering not only technical aspects but social, economic, cultural and political elements that play a relevant role in the governance and success of the process, f) the back analysis of the structural vulnerability showed similar results as observed in place, but human susceptibility was much lower than the estimated on the model, and g) the positive and negative aspects of a big and long-time relocation project that may be of interest for similar cases, considering that the frequency and magnitude of future events due to climate change may produce large population migrations and the necessity to find new places to relocate these people.
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Arbanas, Željko, Josip Peranić, Vedran Jagodnik, Martina Vivoda Prodan, and Nina Čeh. "Remedial Measures Impact on Slope Stability and Landslide Occurrence in Small-Scale Slope Physical Model in 1 g Conditions." In Progress in Landslide Research and Technology. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-44296-4_9.
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AbstractPhysical modelling of landslides by analysing the behaviour of small-scale landslide models subjected to artificial rainfall can be divided into modelling under 1 g conditions and under increased acceleration (n times gravity) in a centrifuge. Physical modelling of landslide initiation began in 1970s in Japan on scaled natural slope models and after initial experiences with field and laboratory research, the small-scale landslide modelling has found a wide application around the world in different aspects of landslide investigations, analysing different types of landslides, different types of slope materials and landslide movements. The main task of landslide physical modelling is research of initiation, motion and accumulation of fast flow-like slides caused by infiltration of surface water or by shaking on a shaking table. Studies that have included landslide mitigation measures into small-scale physical models are rare and have not established correlations with a behaviour of on-site mitigation constructions. This paper discusses the behaviour of small-scale slope models supported by remedial measures under artificial rain in 1 g loading conditions. Models of slope built of different materials, with and without applied remedial measures (gravity retaining wall, gabion wall, pile wall) were exposed to identical intensities of artificial rainfall. The results of the simulations indicated that the slopes supported by remedial measures retained stability of the slope in the same conditions in which the sandy slope collapsed, as well as under significantly prolonged precipitations. At the end of the simulations, significantly higher rainfall intensities were applied to the supported slopes, exceeding the infiltration capacity of the slope material and affecting surface runout. The combination of surface erosion and saturation of superficial layer of a slope caused initiations of flow processes, while complete saturation of a slope when ground water level reached slope surface caused forming of a surface of rupture and consequently movements of the formed landslide body. The data obtained from the geodetic and geotechnical monitoring system enabled understanding of the overall process of rainfall infiltration and soil strength reduction to the development of the surface of rupture in a slope.
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Kujundžić, T., S. Dunda, and S. Vujec. "Possibility of hammer tunnelling in complex geological conditions." In Geotechnical Hazards. CRC Press, 2020. http://dx.doi.org/10.1201/9781003078173-96.
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Arbanas Ž., Benac Č., and Grošić M. "Remedial works on landslide in complex geological conditions." In Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering. IOS Press, 2009. https://doi.org/10.3233/978-1-60750-031-5-2638.
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During the construction of the Adriatic Highway section near Rijeka, Croatia, a landslide occurred on the slope alongside a highway cut. The affected section of the highway route lies on a flysch slope, in a flysch synclinal valley narrowed by limestone rock mass from the Cretaceous Period. Through lateral expansion, the landslide also affected the partly finished highway cut. The landslide occurred on the site formed in layers of Paleogene flysch, a very complex geological material. Complex geotechnical investigation works were carried out for drafting a landslide remediation project. Based on the results of additional investigation works, a landslide remediation project and a new highway cut construction project were made. The basic rock reinforced structure was replaced by an anchored boring pile-wall structure in the toe of the landslide body. The landslide remediation was based on observational methods. The observational methods show the behavior of designed geotechnical structures and allow for potential corrections. This is especially useful in complex geological conditions where site investigation works are not enough to determine the condition of all site features
Conference papers on the topic "Complex geotechnical conditions"
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Subbarao, Harshavardhan. "Innovative Caisson Foundations of Signature Bridge, New Delhi, India." In IABSE Symposium, Tokyo 2025: Environmentally Friendly Technologies and Structures: Focusing on Sustainable Approaches. International Association for Bridge and Structural Engineering (IABSE), 2025. https://doi.org/10.2749/tokyo.2025.0594.
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<p>The Signature Bridge Delhi is India’s most Iconic Bridge with a unique Namaste (Welcoming gesture of folded hands of the Indian culture) shaped pylon in steel. It is an asymmetric cable-stayed bridge with a main span of 251m, steel pylon of 150m height and a bridge deck with an outer-to-outer width of 35.2 m. Well foundations and open foundations were provided to overcome complex geotechnical and site conditions. The paper focuses on the innovative design and construction measures adopted, such as hybrid pile-cum-well foundations, special anchoring systems adopted at the base of well foundations and unique engineering solutions that were necessitated at some other well foundations. The variation of soil layers and the underlying rock profile under the alignment spanning the Yamuna River necessitated an ingenious engineering approach to overcoming the various difficulties in the design and construction of these foundations.</p>
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Mermigas, Konstantinos Kris. "Geneva St Ramp: Replacement of Steel Girder Bridge with Post-Tensioned Concrete Structure on Existing Foundations." In IABSE Congress, San José 2024: Beyond Structural Engineering in a Changing World. International Association for Bridge and Structural Engineering (IABSE), 2024. https://doi.org/10.2749/sanjose.2024.0048.
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<p>The ramp was built in 1963 as part of the original Hwy 406 south of St. Catharines. The existing bridge consisted of five simply supported spans of 22.6 m, each supported by two steel plate girders composite with a concrete deck. The ramp was regularly maintained through the years: a waterproofing membrane was added in 1979 along with sealed expansion joints, and the expansion joints replaced again in 1998. In 2015, the condition of major components had deteriorated significantly and coupled with concerns for redundancy and structural steel details vulnerable to constraint induced fracture (overlapping welds), led to the decision to replace the superstructure.</p><p>The ramp has complex geometry consisting of a tangent, a radial curve and two spirals in plan, a longitudinal grade increasing up to 5%, and the 9.35 m cross-section has variable superelevation. The ramp spans over a valley. After considering several alternatives (including filling in the valley), a post-tensioned concrete solid slab deck of 0.7 m thickness was selected for the replacement superstructure. The new deck is 0.8 m wider and 20% heavier than the steel superstructure it replaces. The geotechnical engineer reanalysed the steel pile foundations with current practices and found potential to increase capacities, later confirmed through additional boreholes.</p><p>The deck is supported on four slender piers monolithic with the deck, and on the existing abutments where semi-integral deck ends support the wingwalls and approach slabs. The reuse of foundations was a defining feature of the project, key to the success of the selected alternative, saving time and cost in construction. Construction of the bridge started in July 2021 and was completed in September 2022. The project demonstrates that post-tensioned concrete bridges can be built competitively with girder bridges and contribute to sustainability.</p>
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Sacadura, T. M. S., N. Taylor, J. Gaudon, K. Sevecek, R. B. Storry, and X. Monin. "Observational Method for Ground Treatment of Tunnel Cross Passages in Complex Ground Conditions." In The HKIE Geotechnical Division 42nd Annual Seminar. AIJR Publisher, 2022. http://dx.doi.org/10.21467/proceedings.133.40.
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This paper focuses on the design and review of the ground treatment and rock fissure grouting required to excavate tunnel Cross-Passages in the Liantang / Heung Yuen Wai Boundary Control Point Site Formation and Infrastructure Works – Contract 2 in Hong Kong SAR. The Cross-Passages were expected to go through Tuff in various degrees of weathering (Grade V to Grade III/II). The Site Investigation, SI, showed that SPTs numbers generally ranged from 30 to 50 for the Completely to Highly Decomposed Tuff, CDT / HDT, with localised values as low as 6. Ground Treatment consisting of permeation and rock fissure grouting as well as 120° pipe roof / canopy tubes, was required to ensure not only the stability during excavation but also limit the groundwater inflow. The SI determined in-situ permeabilities ranging from 1x10-5 to 1x10-6 m/s for the CDT and a 21m long probe hole recorded a water inflow in excess of 60 l/minute. A discussion relative to the methods employed for drilling, e.g. pressure balance drilling system, drilling alignment tools used, and grouting techniques, e.g. microfine cement, chemical grout is presented in this paper. The use of drilling survey tools integrated with 3D representation models of the cross-passage and the ground treatment is discussed. A review of the overall performance of the Cross-Passage, e.g. groundwater inflow, stability, is undertaken.
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Wong, Kelvin C., Taylor S. LaBrecque, and Damian R. Siebert. "Design of a Deep Basement in Atypically Complex Boston Ground Conditions." In Eighth International Conference on Case Histories in Geotechnical Engineering. American Society of Civil Engineers, 2019. http://dx.doi.org/10.1061/9780784482131.019.
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Teoh, M. L., S. J. Clarke, and S. Simmonds. "Investigation of Complex Ground Conditions at Sydney Park for the Sydney Metro City & Southwest Running Tunnels." In International Symposium for Geotechnical Safety & Risk. Research Publishing Services, 2022. http://dx.doi.org/10.3850/978-981-18-5182-7_00-05-005.xml.
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Yao, Aijun, Hu Peng, Huanfang Chen, and Fangduan Ning. "Field Deformation Study on Enclosure Structure and Environment of Subway Shaft Construction under Complex Conditions." In Second International Conference on Geotechnical and Earthquake Engineering. American Society of Civil Engineers, 2013. http://dx.doi.org/10.1061/9780784413128.051.
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Gegieckas, Saulius. "Construction of “Panemunė Bypass” Highway in the Nemunas River Delta. Problems of 2003–2015 Roadbed Exploration, Design, and Construction." In The 13th Baltic Sea Region Geotechnical Conference. Vilnius Gediminas Technical University, 2016. http://dx.doi.org/10.3846/13bsgc.2016.043.
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In the Republic of Lithuania, there had been almost no experience in the road (roadbed) construction prior to the Panemunė bypass in terms of very complex geological, geotechnical and paleogeomorphological territories. All the roads constructed in previous decades in the Nemunas River Delta were built practically without special geotechnical and geological research and the resulting problems were solved either on the spot during construction or rectified later upon the emergence of reclaimed deformation. The article analyzes the whole process of the geological and geotechnical research during the bypass construction – from the first exploration work and designing to construction completion. The geological and geotechnical research stages are described; methods, research conditions, mistakes made, and recommendations for geotechnical investigations under similar conditions in the future are given. At the same time, the article contains the detailed geological and geotechnical conditions of the bypass, roadbed construction problems, forecasts of the roadbed seating during the design and construction with the assumption of additional factors. The article provides and analyses the actual results of the bed deposition monitoring and further forecast of the bed deposition.
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Haryono, I. S., A. L. Saw, S. W. Lee, and Lewis C. K. Wong. "Digital Twin for Geotechnical Engineering Applications." In The HKIE Geotechnical Division 41st Annual Seminar. AIJR Publisher, 2022. http://dx.doi.org/10.21467/proceedings.126.7.
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Engineers have been motivated to push boundaries and find better tools for a more efficient design process and innovative solutions in construction industry. Digital engineering is the synergistic application of electronic and software technologies. The ultimate goal is to produce digital twins which are digital replicas of real and potential physical assets. With the rise of Building Information Modelling (BIM), digital twin in geotechnical engineering focuses more on the data management. However, the inherent information in digital models can be further exploited for optimizing engineering works. In this paper, this process is illustrated from the viewpoint of geotechnical works. Examples on the use of digital twin to design complex deep excavation and earthwork projects in difficult ground conditions are presented. The geotechnical design process was streamlined and the estimated time saving was up to 50% compared with a traditional design method relying on 2D cross sections.
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Varnell, Stephen, Aurelian C. Trandafir, Victoria Fortiz, et al. "Integrated Assessment of Seafloor and Subsurface Site Conditions at Atlantic Shores Offshore Wind Farm Development." In Offshore Technology Conference. OTC, 2023. http://dx.doi.org/10.4043/32431-ms.
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Abstract This study illustrates a ground model approach used to characterize the complex site conditions within the Atlantic Shores Offshore Wind Farm Lease Area. The ground model is the result of the integration of geophysical, geological, geotechnical, and benthic (environmental) data to evaluate marine geohazards and summarize seafloor and sub-seafloor conditions. The ground model is provided in a Geographic Information Systems (GIS) format which can be interactively used for Wind Turbine Generator siting, design, and construction. Various components of the ground model including seafloor sediments and morphology, subsurface geologic features, stratigraphy, soil provinces, and soil profiles are presented and discussed. Soil province variability across the Lease Area has been successfully delineated in detail through the ground model methodology presented in this paper. Geotechnical properties of various identified soil units are generally favorable for a variety of potential foundation types and installation methods. This is one paper in a collaborative series that demonstrates the value of an integrated geoscience approach considering regulatory requirements and project design essentials.
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Zhussupbekov, Askar, Rauan Lukpanov, Dinara Orazova, and Zhanbota Sapenova. "Design of Foundations for Wind Turbine with Analysis by Finite Element Method." In The 13th Baltic Sea Region Geotechnical Conference. Vilnius Gediminas Technical University, 2016. http://dx.doi.org/10.3846/13bsgc.2016.029.
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Presents engineering solution of wind energy tower (WET) foundation and basement designing in hydrogeological conditions of the Ereymentau area. Calculations of forces perceived by the WET, and following bearing capacity, settlement and stability analysis are made by the Finite Element Method in the program complex SCAD and Plaxis 2D. The calculated results in paper had been presented in graphics and tabulars.
Reports on the topic "Complex geotechnical conditions"
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Olsen and Wilson. L52145 Geomechanical Analysis and Design Considerations for Thin-Bedded Salt Caverns. Pipeline Research Council International, Inc. (PRCI), 2005. http://dx.doi.org/10.55274/r0011349.
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he bedded salt formations located throughout the United States are layered and interspersed with non-salt materials such as anhydrite, shale, dolomite and limestone. The salt layers often contain significant impurities. GRI and DOE have initialized this research proposal in order to increase the gas storage capabilities by providing operators with improved geotechnical design and operating guidelines for thin bedded salt caverns. Terralog has summarized the geologic conditions, pressure conditions and critical design factors that may lead to: Fracture in heterogeneous materials; Differential deformation and bedding plane slip; Propagation of damage around single and multiple cavern; Improved design recommendations for single and multiple cavern configurations in various bedded salt environments. The existing caverns within both the Permian Basin Complex and the Michigan and Appalachian Basins are normally found between 300 m to 1,000 m (1,000 ft to 3,300 ft) depth depending on local geology and salt dissolution depth. Currently, active cavern operations are found in the Midland and Anadarko Basins within the Permian Basin Complex and in the Appalachian and Michigan Basins. The Palo Duro and Delaware Basins within the Permian Basin Complex also offer salt cavern development potential. Terralog developed a number of numerical models for caverns located in thin bedded salt. A modified creep viscoplastic model has been developed and implemented in Flac3D to simulate the response of salt at the Permian, Michigan and Appalachian Basins. The formulation of the viscoplastic salt model, which is based on an empirical creep law developed for Waste Isolation Pilot Plant (WIPP) Program, is combined with the Drucker-Prager model to include the formation of damage and failure. The Permian salt lab test data provided by Pfeifle et al. 1983, are used to validate the assumptions made in the material model development. For the actual cavern simulations two baseline models are developed for single and multiple caverns, respectively. Different parameters that affect damage propagation and deformation of salt cavern, such as cavern pressure, operating conditions, cavern height/diameter ratio, overburden stiffness and roof thickness are analyzed and the respective results summarized. For multiple horizontal caverns numerical models are developed to determine the cavern interaction and the minimum safe center to center distance. A step by step methodology for operators to assess critical cavern design parameters for thin bedded salt formations is also presented.
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Eamer, J. B. R., C. Greaves, and E. L. King. The science questions underpinning the potential for offshore wind turbines on Atlantic Canada's continental shelves. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331697.
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Offshore wind farms typically host tens to hundreds of turbines that are individually sited on foundations or anchored if floating. These are connected by inter-farm cables which feed into one or more marine-based substations, further feeding one or more shore-connected high-voltage cables - all infrastructure that requires knowledge of water depth, metocean conditions, and seabed/subsurface geology. With this industry set to establish itself on the continental shelf of Atlantic Canada, knowledge of the geological conditions from the seabed to tens of metres below will be essential for farm layout and foundation design. Thus, geoscience questions addressing regional geomorphology, Pleistocene glacial retreat and sea-level change, the characteristics of key individual stratigraphic layers, and the magnitude and patterns of sediment mobility are important. In Atlantic Canada, ongoing efforts to address these questions are using legacy data, but new data is required to further our understanding of the shallower portions of the shelf. Examples include: what is the distribution of buried tunnel valleys under offshore banks, and might their complex facies infill affect foundation conditions? How and where would the organic sediments, left by a coastal suite of landforms drowned during transgression, affect foundation or landfalling cable stability? How active is salt diapirism, and could it be considered a geohazard? Are demonstrated sediment mass failures also a risk? What is the current understanding of sediment mobility in shallow waters, and how does that affect infrastructure armouring/depth of burial? What is the variability of the geotechnical properties of our offshore sediments? What is the foundation suitability of offshore Tertiary semi-consolidated bedrock? To conclude, the initial scope of a developing regional foundation suitability model will be presented for the Eastern Scotian Shelf.
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Morse, P. D., R. J. H. Parker, S. L. Smith, and W. E. Sladen. Permafrost-related landforms and geotechnical data compilation, Yellowknife to Grays Bay corridor region, Slave Geological Province. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/332017.
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Permafrost conditions in the Slave Geological province are not well understood. Thaw of permafrost and associated ground ice can reduce ground stability, which modifies terrain and drainage patterns and affects terrestrial and aquatic ecosystems. This presents critical challenges to northern resource development and societies where thaw of ice-rich permafrost negatively affects the integrity of ground-based infrastructure. In an effort to address this knowledge gap, this report presents a digital georeferenced database of landforms identified in permafrost terrain using high-resolution satellite imagery and provides information on geomorphic indicators of ground ice presence and thaw susceptibility. Digital georeferenced databases compiled from sedimentological and cryostratigraphic records are also provided. The landform database is focused on mapping within a 10 km-wide swath of land (8576 km2 area of interest) centred on the proposed corridors for the 773 km-long Slave Geological Province Corridor Project, NT, and the Grays Bay Road and Port Project, NU. The geomorphic features were classified and digitized using high-resolution (0.5 m) satellite imagery following an existing protocol, which was modified by using a very high-resolution (2 m) digital elevation model (DEM), and by including mapping criteria for additional features. A total of 1393 geomorphic features were mapped comprising 10 different types, which were categorized into 3 classes that include periglacial (1291), hydrological (88), and mass movement (14) features. Data from 254 geotechnical boreholes and 2243 granular deposits were compiled. Information from the compiled databases was analyzed with surficial geology information. Results indicate that the distributions and densities of mapped landforms varied substantially according to surficial geology. High ground ice contents may be quite common in glaciofluvial deposits where creep of frozen ground affects about 30% of eskers. And ground ice may be more extensive overall than the available geotechnical data indicate. Borehole and granular deposit data suggest that overburden thickness above bedrock was up to 25.5 m, and visible ground ice contents were generally between 10% and 30%, but were up to 60% in glacial blanket and glaciofluvial sediments.