Relevant bibliographies by topics / Cofferdams

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Cofferdams'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 March 2023

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Journal articles on the topic "Cofferdams"

1

Madanayaka, Thushara Asela, and Nagaratnam Sivakugan. "Simple solutions for square and rectangular cofferdam seepage problems." Canadian Geotechnical Journal 56, no. 5 (May 2019): 730–45. http://dx.doi.org/10.1139/cgj-2018-0295.

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Cofferdams are widely used temporary structures at construction sites. Two of the main parameters required in designing a cofferdam are the flow rate and exit hydraulic gradient at the bottom of the excavation. Commonly, these two parameters are evaluated by using two-dimensional (2D) ground water flow models. However, when the flow pattern is three-dimensional (3D), such as flow into the square or rectangular cofferdams, predictions by the 2D models underestimate the flow rate and exit gradients considerably. Therefore, it is necessary to incorporate the 3D flow effect through a correction factor. It is shown that treating a square cofferdam as a circular one of the same width or treating a rectangular cofferdam as a 2D double-walled cofferdam significantly underestimates the flow rate. In this study, simple expressions are developed and validated for accurately estimating the flow rate and exit hydraulic gradient values of square and rectangular cofferdams, based on hundreds of finite element simulations in both 2D and 3D. It is suggested that the expressions given in the Canadian foundation engineering manual be improved.
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Zhao, Chun Ju, Yi Hong Zhou, and Hong Min Guo. "Experimental Study on Flood Control during Construction for Jinping II Hydropower Station." Applied Mechanics and Materials 212-213 (October 2012): 772–79. http://dx.doi.org/10.4028/www.scientific.net/amm.212-213.772.

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Jingping II hydropower project is a diversion type hydropower station with low dam, long tunnel and large capacity. Cofferdams are set to retain water flow which will be diverted through a single tunnel during dry seasons, yet be designed to allow controlled flooding during flood seasons. A physical model is built to study the hydraulic features during flooding process. Then the velocity distribution at critical positions over the overtopped earth-rock cofferdams is tested under design flux and other working conditions, as well as other hydraulic parameters such as press distribution over cofferdam slopes. Moreover, the flow regime over cofferdams is observed, and then the section forms of cofferdams are optimized to ensure the safely passing of flood during construction.
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Liu, Ai Min, and Shu Wang Yan. "New Construction Method of Marine Cofferdam on the Soft Ground in Tideland." Advanced Materials Research 446-449 (January 2012): 1785–90. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1785.

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The marine cofferdams of the littoral new town in Lianyungang were constructed with geotextile bags filled with solidified soil and the soft ground under the cofferdams was treated by under water vacuum preloading method. The dimension of the cofferdams was reduced while the foundation kept stable. And the cofferdams were configurated with the geotextile bags filled with solidified soil, the silt clay was utilized adequately, the sand stone resource was saved and protected, the obvious effect was achieved. This method can be promoted in construction of marine cofferdams.
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Bensmaine, Aissa, Naima Benmebarek, and Sadok Bensmebarek. "Numerical Analysis of Seepage Failure Modes of Sandy Soils within a Cylindrical Cofferdam." Civil Engineering Journal 8, no. 7 (July 1, 2022): 1388–405. http://dx.doi.org/10.28991/cej-2022-08-07-06.

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Soil seepage failure within cofferdams is a dangerous phenomenon that always poses difficulties for designers and builders of excavations in zones with high water levels. When the hydraulic head difference H between the upstream and downstream sides reaches a critical height, the downstream soil seepage failure occurs. Depending on soil properties, soil-wall interface characteristics, and cofferdam design, different seepage failure modes can be observed: heaving, boiling, liquefaction, or failure by reduction of the passive earth pressure. In the literature, there are differences, sometimes very large, in the critical value of the hydraulic head loss Hc/D inducing seepage failure given by several methods proposed for stability verification. Then, complex cases are generally approached using simplifying assumptions and adopting large safety factors to take account of uncertainties. In practice, geotechnical engineers deal with many kinds of excavations and different shapes of cofferdams, such as rectangular, square, or circular, which generate three-dimensional (3D) flow conditions. Axisymmetric seepage flow through the soil in a circular cofferdam is often used to model such 3D seepage flow. In this paper, using the numerical code FLAC, several numerical simulations are carried out in axisymmetric groundwater flow conditions to analyze the seepage failure modes of cohesionless sandy soils within a cylindrical cofferdam. The effects of the cofferdam radius, internal soil friction, soil dilatancy, and interface friction on the Hc/D value and failure mode are studied. The numerically obtained seepage failure modes are presented and discussed in various scenarios. The present results, illustrated in both tables and graphs, show a significant decrease in the value of Hc/Dinducing seepage failure, with a decrease in the cofferdam radius. They also indicate the sensitivity of the seepage failure mode to internal soil friction, soil dilatancy, interface friction, and cofferdam radius. As well, new terms are proposed for the seepage failure mode designations based on the 3D view of the downstream soil deformation. Doi: 10.28991/CEJ-2022-08-07-06 Full Text: PDF
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Cui, Chun Yi, Zhong Tao Wang, and Jian Huang. "Dynamic Analysis of Response of Cofferdam with Steel Sheet Piles Induced by Earthquake Excitation." Applied Mechanics and Materials 117-119 (October 2011): 695–98. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.695.

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For its construction convenience and structure integrity, cofferdams are widely employed in port engineering. Past experience has shown that cofferdam are subjected to damage due to earthquake excitations. Numerical analyses with both response spectrum and step-by-step integration methods are conducted by using Lanczos eigenvalue extraction technique to obtain natural frequencies and modes, and solving dynamic equations with Newmark implicit method to consider geometric nonlinearity. The computational results show that the natural frequency of cofferdam system is low and the horizontal translation stiffness of cofferdam in positive direction is higher than that in negative direction. Under seismic excitation, the displacement response of inner steel sheet is much more obvious than that of outer one. And the distribution of horizontal displacements in steel sheets presents the characteristics that the corresponding values increase with their heights in the cofferdam system. On the contrary, the deviatonic stresses of cofferdam decrease with the augments of height.
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Alfatlawi, Thair J. M., Nassrin J. AL Mansori, and Riyadh A. A. Alsultani. "Stability Assessment of Diaphram Cellular Cofferdams Subjected to Severe Hydro-structural Conditions." Open Civil Engineering Journal 14, no. 1 (March 20, 2020): 44–55. http://dx.doi.org/10.2174/1874149502014010044.

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Background: Cellular cofferdams are a temporary construction consisting of interlocking steel sheet pilings driven into the ground as a series of interconnecting cells. Objectives: This study aims to investigate the stability of cofferdams with a circular diaphragm due to lateral load in dry and wet soil cases. Discussion: A series of laboratory tests were performed on different width to height ratios (0.8, 0.9, and 1.0), berm ratios (0.2H, 0.3H, and 0.4H), and embedment depth ratios (0.2H, 0.3H, and 0.4H) with four types of soil fill (clay soil, river sand, sand passing sieve No.4, and sub base). The coupled circular cofferdam-soil system was modelled using nonlinear finite element analysis (COMSOL Multiphysics Software) to validate the experimental results. Conclusion: After applying hydrostatic, hydrodynamic, and structural failure loads, the resistance of the cellular retaining structures with wet soil fill in saturated soils was greater than with dry soil fill in dry soils. The most advantageous construction format was found by deciphering the relationship between the aforementioned loads and berm ratios, embedment depth, and horizontal displacement.
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Chen, Shi, Yixian Wang, Yonghai Li, Xian Li, Panpan Guo, Weichao Hou, and Yan Liu. "Deformation and Force Analysis of Wood-Piled Island Cofferdam Based on Equivalent Bending Stiffness Principle." Buildings 12, no. 8 (July 27, 2022): 1104. http://dx.doi.org/10.3390/buildings12081104.

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This paper analyses the deformation and force behavior of a wood-piled island cofferdam based on the principle of equivalent bending stiffness. The horizontal deformation and bending moments in wood piles and the axial stress in tension bars on top of piles were both analyzed by the finite difference (FD) method. Except for the analysis of the cofferdam construction process, the influence of the pile length, the dam width, the tension bar interval, and the pile interval, among the commonly adopted parameters, were detailly examined in numerical simulations. In addition, a reinforced wood-piled cofferdam model by steel pipe piles has been established to quantify the effect of reinforcement. It was found that the dewatering inside the cofferdam was detrimental to cofferdam stability. The pile deformation reached maxima (roughly 0.6% of the pile length) at solidifying stage after dewatering. The changing trend of the cofferdam structure force within a safe district was consistent with the displacement. The dam width had a vital effect on the stability of the cofferdam, especially on the horizontal deformation. The steel pipe pile reinforcement scheme performed better in further deformation control, providing a new idea for island-type cofferdams with rigorous structural deformation control.
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Griffiths, D. V. "Seepage beneath unsymmetric cofferdams." Géotechnique 44, no. 2 (June 1994): 297–305. http://dx.doi.org/10.1680/geot.1994.44.2.297.

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King, G. J. W. "Design charts for long cofferdams." Géotechnique 40, no. 4 (December 1990): 647–50. http://dx.doi.org/10.1680/geot.1990.40.4.647.

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Banerjee, Sunirmal. "Design Charts for Double‐Walled Cofferdams." Journal of Geotechnical Engineering 119, no. 2 (February 1993): 214–22. http://dx.doi.org/10.1061/(asce)0733-9410(1993)119:2(214).

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Dissertations / Theses on the topic "Cofferdams"

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Singh, Yash Pal. "Finite element analyses of cellular cofferdams." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/49896.

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Cellular cofferdams have primarily been used as temporary systems which serve to allow construction of facilities in open bodies of water. Applications for these structures have been increasing and today they may serve as permanent retaining walls or as navigation or waterfront structures. Conventional design methods for cellular cofferdams are based on semi-empirical approaches largely developed in the 1940s and 1950s. None of the available traditional procedures are capable of predicting cofferdam deformations, a parameter of key importance to the cofferdam performance, and which is often observed during construction for purposes of safety monitoring. Also, there is evidence that much of the conventional design technology is conservative, in some cases predicting loading by more than twice that which actually occurs. Recently, the finite element method has shown promise as a tool which can be used to help resolve some of the outstanding problems with cofferdam design. There are three primary objectives of this work: (1) enhance existing finite element program to allow for more accurate and refined analysis of cellular cofferdams, (2) use the enhanced finite element programs to assess the degree of conservatism in conventional design methods for cofferdams founded on sandy soils, and (3) use the results of parametric studies of cofferdams founded on sandy soils to develop a simplified procedure to predict cofferdam movements and determine potential for internal failure. The first of the objectives involves adding better bending elements to the program SOILSTRUCT to represent the sheet pile system In axisymmetric and plane strain analyses. Also, in the case of the plane strain program, a new method is developed to allow shear transfer through the sheet pile system. Through case history and theoretical analyses, the enhanced programs are demonstrated to yield accurate and realistic results. Parametric studies using the axisymmetric program show that conventional design methods overpredict, in some areas strongly, the interlock forces which develop during filling of the cofferdam. Parametric studies using the plane strain program suggest that there is also considerable conservatism in design methods to predict internal stability of the cofferdam. A new, simplified method is proposed for this type of analysis. In addition, it is shown that the deformations of cofferdams on sand follow consistent trends and can be set into a nondimensionalized context which can be used to predict future cofferdam movements.
Ph. D.
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Iqbal, Qaiser. "The performance of diaphragm type cellular cofferdams." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/73612/.

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The construction of water management and navigation structures often requires temporary works to exclude water to facilitate construction in the dry or at least under a lower water level within the construction area. The use of cellular cofferdams for both temporary and permanent earth/water retaining works is very common. A number of theories are presented that describe the failure mechanisms involved. These failure mechanisms were identified from model studies on circular type cofferdams are applied independent of cofferdam geometry. It is common to use diaphragm type cofferdams. To asses the validity of common failure mechanisms associated with cellular cofferdams when applied to diaphragm type cofferdams, a series of numerical modelling analyses were conducted. These were validated using field monitoring results of a large scale diaphragm type cofferdam constructed at St. Germans, Norfolk, UK. A series of plane strain analyses of a diaphragm type cofferdam were conducted using the geometry from a critical section of cofferdam. These analyses identified the lowest factor of safety based on the drained strength of the clay on which the cofferdam was constructed. The water level within the river was increased to accommodate flooding and soil strength was reduced to identify the general failure mechanism. The structural forces were calculated using both 2D and 3D models for a larger width section (13m wide) to allow comparison with wall bending moments and displacements measured in field. The 3D analyses used actual tie spacing and membrane effects whilst reducing the lateral stiffness of the wall to accommodate the stiffness reduction due to variation in the interlock forces. To measure the bending moment in sheet piles, resistance type strain gauges were installed on a 13m wide section of cofferdam. The cell deflection, river and cell water levels were also monitored to identify tidal river effect and the influence of cell water level on performance. Comparison of field and numerical results highlighted a number of important design and construction detail related to diaphragm type cellular cofferdams.
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Hardin, Kenneth O. "Finite element analysis of cellular steel sheet pile cofferdams." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/39758.

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A cellular cofferdam represents a challenging soil-structure interaction problem. The cellular system consists of a combination of a flexible structure formed from interlocking sheet piles that is filled with soil. In the past, the cellular cofferdam has been viewed as a temporary structure, and the design procedures have been based on empirical concepts. Basic to these approaches are assumptions of soil and structural behavior that have, at best, only a rough accounting for soil-structure interaction. In the last decade, work on cofferdams has improved our understanding of the behavior of these systems. Documentation of performance has increased, and in a few cases major instrumentation efforts have been undertaken. Concurrently, finite element methods have been introduced for the analysis of cofferdams. Where the finite element models have been properly calibrated by field performance, they have reasonably predicted the principal aspects of cofferdam behavior. Results of the finite element models have also served to help explain some aspects of the soil-structure interaction process in the cofferdam system. Two finite element programs are used in this research, AXISHL and GPS. The first of these is an axisymmetric analysis tool which is applicable to the case of filling of a main cell. The second program provides a simplified means of analyzing the main/arc cell and common wall system. Both programs are used in a series of parameter studies with the objective to provide information that will allow improvement of the state-of-the-art of design for cofferdams. An analytical solution is proposed which allows an insight to be developed as to how the clamping effect at the dredge line affects the behavior of the system. A simplified calculation procedure which has some of the characteristics of the finite element analysis is developed to supplement the need for a finite element analysis.
Ph. D.
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Mosher, Reed L. "Three-dimensional finite element analysis of sheet-pile cellular cofferdams." Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/37876.

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The conventional design methods for sheet-pile cellular cofferdams were developed in the 1940's and 1950's based on field and limited experimental observations. The analytical techniques of the day were unable to account for the complexities involved. The procedures used only rudimentary concepts of soil-structure interaction which do not exhibit the true response of the cofferdam for most circumstances. During the past decade it has been demonstrated that with proper consideration of the soil-structure interaction effects, the two-dimensional finite element models can be powerful tools in the investigation of cellular cofferdam behavior. However, universal implementation of the findings of these analyses was difficult to justify, since uncertainties remain about the assumptions made in arriving at the two-dimensional models. The only way to address these uncertainties was to perform a three-dimensional analysis. This investigation has focused on the study of the three-dimensional behavior of Lock and Dam No. 26 (R) sheet—pile cellular cofferdam. The work involved the development of a new three-dimensional soil-structure interaction finite element code for cellular cofferdam modeling, and the application of the new code to the study of the behavior of the first- and second-stage cofferdam at Lock and Dam No. 26 (R). The new code was used to study the cell filling process where the main cell is filled first with the subsequent filling of the arc cell. The finite element results show that interlock forces in the common wall were 29 to 35 percent higher than those in the main cell which are less than those calculated by conventional methods and compare well with the observed values. After cell filling, the new code was used to model the cofferdam under differential loading due to initial dewatering of the interior of the cofferdam and changes in river levels. The finite element analysis results show that increasing differential water loads cause the confining stresses in the cell fill to increase which results in a decrease in the level of mobilized shear strength in the cell fill. This explains why the cellular cofferdam can withstand extremely high lateral loads and lateral deformations without collapsing.
Ph. D.
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Uribe-Henao, A. Felipe. "Effects of Pre-Excavation Activities on the Performance of Urban Cofferdams." Thesis, California State University, Long Beach, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10264378.

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Cofferdams are often employed as temporary watertight structures made of sheet piles and internally braced with steel or reinforced concrete ring beams to retain surrounding soil. For urban cofferdam excavations, soil removal is performed following a bottom-up performance and concrete shear walls and foundations are installed in rock or competent soil. The main goal of this study is to compare the observed performance of two cofferdams projects and conduct a series parametric analysis to study the effects of installation activities of steel ring beams. The first case history is the One Museum Park West (OMPW) and the second is the construction of a cofferdam of a structure projected to be the tallest building in America and the deepest basement built in the city. These two cofferdams evidence the need of a strict deformation control plan applicable to every construction stage, including those considered as ancillary.

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Huang, Ching-Yang. "Comparison and results of sheet pile interlock analysis." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/45160.

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A finite element program for analyzing the nonlinear behavior of moving contact problems has been developed and used for the analysis of a single sheet pile interlock (Chan and Barker (1985), Wu and Barker (1986). In this study, the program is modified to simulate a sheet pile pull-out test with a new finite element mesh. The improved mesh contains a full-length sheet pile with both of its interlocks connected to two half-length sheet piles. The results are presented and compared with the results of the pull-out tests which were conducted by O'Neil and McDonald at WES (1985). The comparison is not completely satisfactory because the initial slack between interlocks is not modeled. Nonetheless, the general behavior of sheet piles under tensile load is correctly predicted by the finite element program.

For easier interpretation of the output from the finite element analysis, the computer graphics software AutoCAD (Auto desk, 1986) is adopted to serve as a postprocessor. Several features of AutoCAD such as overlaying, zooming, and macro instructions are utilized to serve this purpose. Some intermediate programs are also developed for the communication between the finite element program and AutoCAD.
Master of Science

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Fagan, Tony Duane. "Effect of membrane weight on vibrations of air-inflated dams." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/91167.

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Inflatable dams are flexible membrane structures, pressurized with either air, water, or both, which have been used in recent years as a means of temporarily impounding water. A number of procedures have been developed to investigate the static behavior of the dams, but the dynamic behavior has been largely neglected. The few studies that have been done on dynamic behavior have used the simplifying assumption that the weight of the membrane was negligible. In this study, equations of equilibrium and equations of motion were derived for an air inflated dam impounding no water, but loaded with its own membrane weight. It was assumed that the effect of membrane extensibility is negligible in the analysis. Derivatives required in the equations of motion were approximated using finite difference equations. Computer programs were written to find solutions for the eigenvalues and eigenvectors of the equations of motion. The computer program plotted the mode shapes of vibration associated with the four lowest eigenvalues, as well as the static shape of the dam. The eigenvalues obtained were the square of the frequencies of the system, so the effects of a series of membrane weights on the frequencies of dams of various base lengths could be analyzed.
M.S.
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Saponaro, Antonio. "On the stability analysis of a cellular cofferdam." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amslaurea.unibo.it/162/.

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Zetková, Simona. "Design of Offshore Cofferdam Loaded by Vertical Surcharge." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265262.

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The aim of this thesis is to undertake simplified design and assessment of cofferdam under vertical surcharge in the form of virtual project. Cofferdam constructed on the sea shore must be able to withstand all loads to enable construction of cut and cover tunnel. As a part of the design it is required to assess ground conditions and it is necessary to review feasibility of the structure on the sea. The construction will be described in construction phases and graphically demonstrated in construction sequence drawing. Because the structure is designed for life time of five years, temperature load on struts is studied in the thesis and further considered in structural analysis. Furthermore, it is required to compare analytical models from GEO5 and PLAXIS. Horizontal frame is analysed separately in Scia Engineer. Structural members – cofferdam wall, waler beam and strut are checked in this thesis. For the design of the cofferdam wall second order theory is considered. All mentioned requirements were accomplished with help of corresponding Eurocodes, books and technical advice. Results of this work are feasible and it was possible to design all members to enable construction of the cut and cover tunnel. The phasing was designed such that deformation of the cofferdam is minimalized and use of machinery is limited to machines on temporary platforms. Comparison of two different analytical models showed that different soil modelling has great effect on internal forces, even though the shape of the bending curve is very similar, values obtained from PLAXIS software are much higher. Assessment of the structural members is done according to Eurocode 3, and horizontal frame is checked also against disproportionate collapse.
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Muller, Jacobus Johannes. "Options to reduce sediment build-up in a surf zone trench protected by an open-ended cofferdam." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96922.

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Thesis ((MEng)--Stellenbosch University, 2015.
ENGLISH ABSTRACT: When constructing a submarine pipeline, construction teams must work in the hostile environment in the ocean known as the surf zone. The surf zone is the area along a shoreline stretching between the first evident point of wave breaking and the beach line. In order to ensure that the pipeline is shielded from the imposing forces within the surf zone, engineers use a burial technique which leaves the pipeline length in the surf zone buried underneath the active seabed once construction is finished. Thus a temporary surf zone trench is dredged and protected by an open-ended cofferdam built using iron sheet piles. As a result of the incoming wave climate and the surf zone currents created by this wave climate, sedimentation in and around the trench becomes problematic. In this study alternative geometric layouts for the open-ended cofferdam protecting the surf zone trench are investigated, attempting to minimize the sediment build-up in and around the trench. This was done by using both a 3D qualitative physical model conducted at the CSIR in Stellenbosch, and numerical model using MIKE developed by DHI. However, this study only considers sediment build-up and not structural integrity and constructability of the cofferdam designs. Combining the observations of both the physical- and numerical models, a conclusion was drawn that a structure built perpendicular to the shoreline with a 45oextended arm built from the upstream edge of the cofferdam wall, is the most effective. No dimensions are given as the cofferdam design will change depending on the site specific characteristics. Also an increase in structure length will result in the mouth of the structure being located outside the active sediment zone, which leads to a longer period of time before the pipeline pathway is compromised by sediment.
AFRIKAANSE OPSOMMING: Tydens die konstruksie van 'n onderwaterse pyplyn, moet konstruksie spanne in 'n gevaarlike gedeelte van die see werk naamlik die brandersone. Die brandersone kan gedefinieer word as die area tussen die eerste punt waar branders breek en die strandlyn. Om die pyplyn te beskerm teen die kragte wat branders op dit uitoefen, gebruik ingenieurs 'n installasietegniek waar hul die brandersone seksie van die pyplyn onder die aktiewe seebodem begrawe. Om die tegniek te bewerkstellig, grawe kontrakteurs 'n sloot deur die brandersone en beskerm dit met 'n tydelike struktuur bekend as 'n kofferdam. As gevolg van die inkomende branders en die strome wat deur die branders aangedryf word, kan die opbou van sediment in, en rondom die sloot in die brandersone problematies word. Hierdie studie ondersoek alternatiewe uitlegte vir die tydelike kofferdam struktuur met die oog daarop om die opbou van sediment in, en rondom die struktuur te verminder. Die doel was nagestreef deur gebruik te maak van beide 'n 3-dimensionele fisiese model, gebou en gebruik by die WNNR in Stellenbosch, en 'n numeriese model wat op MIKE, ontwikkel deur DHI gedoen was. Let wel die studie het slegs die sediment beweging in die nabye area van die tydelike kofferdam struktuur in ag geneem en nie die praktiese implimentering en strukturele integriteit van die struktuur nie. Deur die observasies van beide die fisiese- en numeriese modelering in ag te neem, is die volgende gevolgtrekkings gemaak. 'n Struktuur wat loodreg met die strandlyn gebou is en met 'n 45o arm wat na die stroom-op kant toe uitstrek, was die mees effektiewe een. Geen dimensies is deurgegee nie aangesien die ontwerp sal verskil afhangende van die spesifieke area waar die projek aangepak word. Daar is ook gesien dat indien die struktuur langer gemaak word, sal die kontrakteur langer tyd h^e voordat daar sediment probleme in die brander sone sloot ondervind sal word.
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Books on the topic "Cofferdams"

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Pyŏn, Tong-myŏng. Kwangju yŏksa wa hamkke han Kyŏngyang pangjuk kŭrigo T'aebongsan. Kwangju Kwangyŏksi: Chŏnnam Taehakkyo Ch'ulp'an Munhwawŏn, 2020.

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D, Waite, and Construction Industry Research and Information Association., eds. The design and construction of sheet-piled cofferdams. London: Construction Industry Research and Information Association, 1993.

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Kadhim, Saad Eadhil. Numerical solution of seepage into sheet pile cofferdams. Birmingham: University of Birmingham, 1989.

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Shui gong wei yan chai chu bao po. Beijing: Zhong guo shui li shui dian chu ban she, 2009.

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O'Bannon, Patrick. Working in the dry: Cofferdams, in-river construction, and the United States Army Corps of Engineers. Pittsburgh, Penn: U.S. Army Corps of Engineers, Pittsburgh District, 2009.

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Zhongguo San Xia gong cheng RCC wei yan bao po chai chu xin ji shu: New technology of RCC cofferdam blasting demolition for the Three Gorges Project in China. Beijing Shi: Zhongguo shui li shui dian chu ban she, 2008.

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Buck, Pile. Cellular Cofferdams. Lulu Press, Inc., 2012.

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Underwater Construction Using Cofferdams. Best Publishing Company, 2001.

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Pevny, Taras. Historic Naval Architecture Practices as a Guide to Shipwreck Reconstruction: The La Belle Example. Edited by Ben Ford, Donny L. Hamilton, and Alexis Catsambis. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780199336005.013.0012.

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This article describes the experience of reconstruction of a ship built by a seventeenth century ship builder. The lower hull and partial cargo of La Belle were discovered in 1995 and excavated within a dry cofferdam. The hull was documented, disassembled, and subjected to additional recording and reassembled in order to conserve it as a unit. On the basis of the present remains, the hull was reconstructed and several aspects of design and construction were understood. The discovery of new information, whether in the process of the reconstruction of the archaeological remains or from documentary research, necessitated a reexamination and/or a reworking of earlier recordings, preliminary reconstructions, and working hypotheses. Studying the design of La Belle was to a great extent a circular process—much like a design spiral in modern naval architecture.
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A bill to provide for outlet modifications to Folsom Dam, California, reconstruction of Northfork American River Cofferdam, transfer of Auburn Dam, and for other purposes: Report together with dissenting views (to accompany H.R. 4111) (including cost estimate of the Congressional Budget Office). [Washington, D.C: U.S. G.P.O., 1998.

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Book chapters on the topic "Cofferdams"

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Fetzer, Claude A., and Edwin Paul Swatek. "Cofferdams." In Advanced Dam Engineering for Design, Construction, and Rehabilitation, 219–38. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0857-7_7.

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Jones, B. D., E. Murphy, and P. J. Astle. "Design of large twin-wall cofferdams for ship impact." In Geotechnical Aspects of Underground Construction in Soft Ground. 2nd Edition, 60–67. 2nd ed. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003355595-8.

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Harris, G. "The Use of Cofferdams for Welded Repairs to Offshore Structures." In Advances in Underwater Technology, Ocean Science and Offshore Engineering, 263–69. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4203-5_30.

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Qian, Qin, Saeid Eslamian, Kaveh Ostad-Ali-Askari, Maryam Marani-Barzani, Farnaz Rafat, and Ali Hasantabar-Amiri. "Cofferdam." In Selective Neck Dissection for Oral Cancer, 1–2. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-12127-7_59-1.

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Qian, Qin, Saeid Eslamian, Kaveh Ostad-Ali-Askari, Maryam Marani-Barzani, Farnaz Rafat, and Ali Hasantabar-Amiri. "Cofferdam." In Encyclopedia of Earth Sciences Series, 159–61. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73568-9_59.

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Geng, Wenbin, Xiaomin Liu, Dianyong Wang, Renliang Li, and Chuandong Liu. "Key technologies for the design and rapid construction of steel cofferdams at Guojiatuo Yangtze river bridge." In Frontiers of Civil Engineering and Disaster Prevention and Control Volume 1, 633–41. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003308577-86.

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Voet, D. M. "3 Cofferdam." In Zelfstandige (be)handelingen voor de tandartsassistent, 62–83. Houten: Bohn Stafleu van Loghum, 2004. http://dx.doi.org/10.1007/978-90-313-9774-7_3.

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"CHAPTER IV. EXCAVATIONS, DREDGING, PILE-DRIVING, AND COFFERDAMS." In CIVIL ENGINEERING AS APPLIED IN CONSTRUCTION, 36–60. Thomas Telford Publishing, 2011. http://dx.doi.org/10.1680/ceaaic.50785.0004.

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Jones, B. D., E. Murphy, and P. J. Astle. "Design of large twin-wall cofferdams for ship impact." In Geotechnical Aspects of Underground Construction in Soft Ground, 60–67. CRC Press, 2021. http://dx.doi.org/10.1201/9780429321559-8.

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Tirolo, V., and N. Hirsch. "Subway rehabilitation – secant wall cofferdams and penetration of tunnel liner." In North American Tunneling 2004. Taylor & Francis, 2004. http://dx.doi.org/10.1201/9781439833759.ch16.

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Conference papers on the topic "Cofferdams"

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Gutierrez, Marte, and Simon Heru Prassetyo. "Cellular Cofferdams for Hydropower Generation." In The 7th World Congress on Civil, Structural, and Environmental Engineering. Avestia Publishing, 2022. http://dx.doi.org/10.11159/icgre22.179.

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Kim, Jae-Hyun, Zhenhua Xin, and Ju-Hyung Lee. "Field Trials of Suction-Assisted Installation of Circular Steel Pipe Cofferdam in Silty Sand." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19060.

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Abstract The cofferdam is the temporary barrier to stop the flow of water from a construction site work such as a support column foundation at a river or offshore. It allows for working in the dry condition when the construction is done adjacent or within the waters. However, it is a major cause of delays and increased construction costs because additional works are required to stop the water flow. Recently, in order to overcome the limitations of the conventional cofferdam methods such as sheet pile or caisson tube cofferdams, a large-diameter steel pipe cofferdam method has been proposed which can be installed quickly using suction installation method. The steel pipe cofferdam method is characterized in that the top-lid of the steel pipe is located above the sea level in order to use it as a water barrier, unlike conventional suction buckets where the whole structures are submerged. In this study, the circular steel pipe cofferdam with a 5 m inner diameter was fabricated and the installation tests were conducted on silty sand at the Saemaguem test site. During the experiment, variations of suction pressure and inclination of the steel pipe cofferdam were measured and post-analyzed. This study verified the new steel pipe cofferdam method and confirmed that the suction installation method can be successfully used for various purposes on the offshore structures.
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Uribe-Henao, A. Felipe, Luis G. Arboleda-Monsalve, Alejandro Velasquez-Perez, David G. Zapata-Medina, and Fernando Sarabia. "Temperature and Concrete Time-Dependent Effects on Urban Cofferdams." In IFCEE 2018. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481608.002.

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Stanko, Milan, Andrea Shmueli, Miguel Asuaje, Frank Kenyery, Gonzalo Montilla, Mari´a de los A´ngeles Toscano, and Richard Sa´nchez. "CFD Simulation of the Submerged Cofferdams Effect on the Operation of the Future Tocoma Hydroelectric Power Plant." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78265.

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The Tocoma hydroelectric power plant, currently under construction, is located on the lower basin of the Caroni River in Bolivar State in Venezuela. This power plant will have 10 Kaplan turbines in its powerhouse that will generate approximately 2160 MW of hydroelectric power. During its construction, two cofferdams designated “A” and “B” will be built and afterwards will remain submerged. The main purpose of this experimental-numerical study is to analyze the possible future hydrodynamic effects of these structures on the operation of the Kaplan turbines. The presence of the submerged cofferdams could originate tridimensional hydrodynamic behaviors that could produce energy looses and operational and functional problems to the turbines. Two mathematical steady state single phase models using Computational Fluid Dynamics (CFD) Techniques and applying the commercial software ANSYS-CFX were developed. The first model represented the hydroelectric power plant reservoir that was quantitatively and qualitatively calibrated with a Froude Similarity 1:80 Scale Physical Model. Hydrodynamic flow patterns near to the intakes were found in the first model. Those patterns showed a non-uniform velocity profile in the unit’s intakes nearest to cofferdam “B”. The second mathematical model represented the study of the intake, the semi-spiral case and the Kaplan turbine. This model considers the non-uniform velocity profile that was found in the first model as an inlet boundary condition. Two methodologies were used to develop this model: one using two simulations with two overlapping physical domains, and the other one using the whole geometry. It was found that using overlapping domains in order to reduce the computational cost of the total simulation is a good way to obtain physical results with fair accuracy. The general results reported that the velocity profile at the intake of the powerhouse does not produce any stationary non uniform behavior on the velocity and pressure profiles in the unit compared to the uniform velocity profile case. This result could be an indicator that the non uniform condition at the intake of the Kaplan Turbines at Tocoma will not affect the normal operation conditions of the unit.
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Beer, Ira A., Martin McDermott, and Richard Palmer. "Replacing Subaqueous Water Mains to City Island Using Secant Shaft Cofferdams." In Geo-Congress 2022. Reston, VA: American Society of Civil Engineers, 2022. http://dx.doi.org/10.1061/9780784484067.029.

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Morea, Gregory F., and Nellichery Thiyagarajan. "Laser Scanning Supporting Graving Dock Retrofit." In SNAME Maritime Convention. SNAME, 2005. http://dx.doi.org/10.5957/smc-2005-p14.

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In July 2004, Electric Boat Corporation decided to retrofit Graving Dock 3 at its Groton, Connecticut shipyard with a reinforced concrete wall designed and constructed to replace the existing cellular cofferdams that comprise the dock. Since the cofferdams are of various heights and have deflected in different ways over the years, an efficient method was needed to capture the as-built configuration of the graving dock before design of the wall could be finalized. The owner, design agent and contractor chose a combination of 3D laser scanning, post processing, and CAD modeling to capture this as-built condition. The resulting three dimensional CAD surface model of the dock became integral with the design of the wall and its construction. This paper will provide an overview of the reasons laser scanning was chosen and a description of how the laser scans were taken and processed. The paper will also discuss how a CAD model was created from the processed data, and more significantly, how the model was used in the development of design and construction drawings. The paper will conclude with a look at how 3D laser scanning is being used on other projects at Electric Boat, for both shipbuilding and facilities.
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Zhang, Junle. "Construction of Flexible Waterstops on Underwater Cofferdams for Pile Caps in Bridge Projects." In IABSE Congress, Nanjing 2022: Bridges and Structures: Connection, Integration and Harmonisation. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/nanjing.2022.1103.

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<p>The water-stopping efficiency of cofferdams for pile caps is an important indicator with direct influ- ence to the quality and durability of the pile-pouring process. In recent years, a new technique fea- turing flexible capsules serving as waterstops has been introduced, but is still in experimental stage. This thesis, taking the water-stopping construction programme of underwater PC houses of the J. P. Magufuli Bridge project in Tanzania as background, analyzed the two existed types of flexible water- stopping construction methods, id est the integral and separate structures, and studied on measures for improving the flexible water-stopping construction techniques and optimizing the rubber cap- sule waterstops, in the hope of providing references and, possibly, inspirations for similar projects in the future.</p>
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Uribe-Henao, A. Felipe, and Luis G. Arboleda-Monsalve. "Sheet Pile Interlocks and Ring Beam Installation Effects on the Performance of Urban Cofferdams." In Geotechnical Frontiers 2017. Reston, VA: American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784480458.017.

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Uribe-Henao, A. Felipe, Luis G. Arboleda-Monsalve, and David G. Zapata-Medina. "Investigating Nonlinear and Time-Dependent Response of Concrete on the Performance of Urban Cofferdams." In Eighth International Conference on Case Histories in Geotechnical Engineering. Reston, VA: American Society of Civil Engineers, 2019. http://dx.doi.org/10.1061/9780784482087.006.

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Elliott, Gordon, Paul Martin, and Daniel D. Uranowski. "Design and Construction of Circular Cofferdams for Earth Retention in a Flyash Disposal Basin." In Earth Retention Conference (ER) 2010. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41128(384)36.

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Reports on the topic "Cofferdams"

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Prassetyo, Simon Heru, Soheyl Khademian, and Marte Gutierrez. CELLULAR COFFERDAMS FOR HYDROPOWER USE. Office of Scientific and Technical Information (OSTI), March 2020. http://dx.doi.org/10.2172/1607488.

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O'Bannon, Patrick. Working in the Dry: Cofferdams, In-River Construction, and the United States Army Corps of Engineers. Fort Belvoir, VA: Defense Technical Information Center, January 2009. http://dx.doi.org/10.21236/ada515018.

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