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Journal articles on the topic 'Rock Fracture'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 June 2025

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1

Schoenberg, Michael, and Colin M. Sayers. "Seismic anisotropy of fractured rock." GEOPHYSICS 60, no. 1 (1995): 204–11. http://dx.doi.org/10.1190/1.1443748.

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A simple method for including the effects of geologically realistic fractures on the seismic propagation through fractured rocks can be obtained by writing the effective compliance tensor of the fractured rock as the sum of the compliance tensor of the unfractured background rock and the compliance tensors for each set of parallel fractures or aligned fractures. The compliance tensor of each fracture set is derivable from a second rank fracture compliance tensor. For a rotationally symmetric set of fractures, the fracture compliance tensor depends on only two fracture compliances, one controll

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2

Zhang, Qinghe, Bing Zhang, Chen Chen, et al. "A Test Method for Finding Early Dynamic Fracture of Rock: Using DIC and YOLOv5." Sensors 22, no. 17 (2022): 6320. http://dx.doi.org/10.3390/s22176320.

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Intelligent monitoring and early warning of rock mass failure is vital. To realize the early intelligent identification of dynamic fractures in the failure process of complex fractured rocks, 3D printing of the fracture network model was used to produce rock-like specimens containing 20 random joints. An algorithm for the early intelligent identification of dynamic fractures was proposed based on the YOLOv5 deep learning network model and DIC cloud. The results demonstrate an important relationship between the overall strength of the specimen with complex fractures and dynamic fracture propaga

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3

Shi, Di, Liping Li, Jianjun Liu, Mingyang Wu, Yishan Pan, and Jupeng Tang. "Effect of discrete fractures with or without roughness on seepage characteristics of fractured rocks." Physics of Fluids 34, no. 7 (2022): 073611. http://dx.doi.org/10.1063/5.0097025.

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This study proposes a new fractal permeability model for fractured rocks that comprehensively accounts for the geometric fracture characteristics and the fluid transport mechanism. Then, the permeability changes of fractured rocks are analyzed using discrete fracture networks (DFNs) with or without roughness and different geometry parameters in the DFN modeling and finite element simulation. The results show that the proposed permeability model well agrees with the experimental data, and the established DFN numerical model more realistically reflects the fracture network in fractured rocks. Fl

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4

Roshankhah, Shahrzad, Arman K. Nejad, Orlando Teran, and Kami Mohammadi. "Modelling the variation in the behaviour of pre-fractured rocks subjected to hydraulic fracturing with permeability of the rock matrix using finite-discrete element method." E3S Web of Conferences 205 (2020): 08001. http://dx.doi.org/10.1051/e3sconf/202020508001.

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In this study, we present the results of two-dimensional numerical simulations for the effects of rock matrix permeability on the behaviour of hydraulic fractures in intact and pre-fractured rocks. The simulations are performed using the Finite-Discrete Element Method (FDEM). In this method, the deformation and fluid pressure fields within the porous rock blocks, pre-existing fracture network, and hydraulically induced fractures are calculated through a fully coupled hydromechanical scheme. Furthermore, new fractures can initiate in crack elements located between each pair of finite elements a

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5

Wang, E. Z., Z. Q. Yue, L. G. Tham, Y. Tsui, and H. T. Wang. "A dual fracture model to simulate large-scale flow through fractured rocks." Canadian Geotechnical Journal 39, no. 6 (2002): 1302–12. http://dx.doi.org/10.1139/t02-068.

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Discrete fracture network models can be used to study groundwater flow in fractured rock masses. However, one may find that it is not easy to apply such models to practical projects as it is difficult to investigate every fracture and measure its hydraulic parameters. To overcome such difficulties, a dual fracture model is proposed. Taking into account the hydraulic characteristics of the various elements of the fracture system, a hydrogeological medium is assumed to consist of two components: the dominant fracture network and the fractured rock matrix. As the dominant fracture network consist

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6

LV, WEIFENG, GUOLIANG YAN, YONGDONG LIU, XUEFENG LIU, DONGXING DU, and RONG WANG. "EFFECT OF FRACTAL FRACTURES ON PERMEABILITY IN THREE-DIMENSIONAL DIGITAL ROCKS." Fractals 27, no. 01 (2019): 1940015. http://dx.doi.org/10.1142/s0218348x19400152.

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The fracture has great impact on the flow behavior in fractured reservoirs. Fracture traces are usually self-similar and scale-independent, which makes the fractal theory become a powerful tool to characterize fracture. To obtain three-dimensional (3D) digital rocks reflecting the properties of fractured reservoirs, we first generate discrete fracture networks by stochastic modeling based on the fractal theory. These fracture networks are then added to the existing digital rocks of rock matrixes. We combine two low-permeable cores as rock matrixes with a group of discrete fracture networks wit

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7

Xu, Chaoshui, Shaoqun Dong, Hang Wang, et al. "Modelling of Coupled Hydro-Thermo-Chemical Fluid Flow through Rock Fracture Networks and Its Applications." Geosciences 11, no. 4 (2021): 153. http://dx.doi.org/10.3390/geosciences11040153.

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Most rock masses contain natural fractures. In many engineering applications, a detailed understanding of the characteristics of fluid flow through a fractured rock mass is critically important for design, performance analysis, and uncertainty/risk assessment. In this context, rock fractures and fracture networks play a decisive role in conducting fluid through the rock mass as the permeability of fractures is in general orders of magnitudes greater than that of intact rock matrices, particularly in hard rock settings. This paper reviews the modelling methods developed over the past four decad

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8

Glad, Aslaug Clemmensen, Tobias Orlander, Ida Lykke Fabricius, Ole Rønø Clausen, and Lars B. Clemmensen. "Characteristics and formation of natural fractures in a silica-rich chalk, Coniacian Arnager Limestone Formation, Bornholm, Denmark." Bulletin of the Geological Society of Denmark 73 (October 18, 2024): 157–73. http://dx.doi.org/10.37570/bgsd-2024-73-09.

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Natural fractures are abundant and important components in many carbonate sedimentary rocks globally. In hydrocarbon and groundwater reservoirs of carbonate rocks they can form connected networks and thereby influence the permeability and f luid flow significantly. Outcrop studies of fractured carbonate rocks can provide an essential understanding of 3-dimensional fracture networks, thereby aiding in understanding fracture patterns and connectivity in subsurface carbonate reservoirs. The Arnager Limestone Formation is a naturally fractured silica-rich chalk of Coniacian age exposed in a coasta

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9

Han, Tongcheng, and Sam Yang. "Dielectric properties of fractured carbonate rocks from finite-difference modeling." GEOPHYSICS 84, no. 1 (2019): MR37—MR44. http://dx.doi.org/10.1190/geo2018-0003.1.

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Fractures are common features in virtually all types of geologic rocks and tend to dominate their mechanical and hydraulic properties. Detection and characterization of fractures in rocks are of interest to a variety of geophysical applications. We have investigated the frequency-dependent dielectric properties of fractured porous carbonate rocks in the frequency range [Formula: see text] and their relationships with different types of fluids filling the fractures, fracture connectivity, and directions of electrical field applied to the rocks using numerical simulation methods based on a 3D fi

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10

Sun, Lichen, Peijie Lou, Cheng Pan, and Penghui Ji. "Mechanical Properties and DEM-Based Simulation of Double-Fractured Sandstone Under Cyclic Loading and Unloading." Sustainability 16, no. 20 (2024): 9000. http://dx.doi.org/10.3390/su16209000.

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In response to the challenges posed by long-term cyclic loading and unloading in underground rock engineering, this study systematically investigates the macro- and meso-mechanical response mechanisms of fractured rock masses under cyclic loading conditions. We performed graded cyclic loading–unloading tests on parallel double-fractured sandstone samples with varying spatial distribution configurations. These tests were integrated with digital image correlation (DIC) technology, fractal dimension analysis, and discrete element method (DEM) numerical simulations to analyze the mechanical proper

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11

Pan, Bin, and Yang Song Zhang. "Searching for the Shortest Seepage Path of 3D Network in Fractured Rock Masses." Applied Mechanics and Materials 580-583 (July 2014): 857–61. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.857.

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Fractured rock is a combination of rocks and fractures,the fractures which are ubiquitously distributed in fractured rock mass often constitute the flow and migration path of underground fluid and radionuclide.Discrete Fracture Network Model (DFN) was built with in-situ observations to evaluate the hydraulic conductivity tensor of rock masses.The fractures relation pattern with corresponding algorithm is given on the basis of computational geometric,and then the graph theory is employed as the mathematical model to represent the mutual positional relation of fractures.And then,with the use of

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Fan, Ling, Chengbo Wang, and Di Hu. "Experimental Study on Acoustic Emission Characteristics of Uniaxial Compression of MICP-Filled Sandstone." Materials 16, no. 9 (2023): 3428. http://dx.doi.org/10.3390/ma16093428.

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Rock masses are inherently heterogeneous, with numerous fractures that significantly affect their mechanical properties, fracture characteristics, and acoustic emission features due to the interactions between fractures or between fractures and the rock mass. Microbially induced calcite precipitation (MICP) technology, as an emerging non-destructive biological grouting reinforcement method, can repair fractured rock masses and alter their internal conditions. To investigate the mechanical properties, failure process evolution, and MICP repair effects of sandstone before and after repair, uniax

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Tang, Xiaoyu, Wen Wan, Zhenxing Lu, and Wei Chen. "Study on Composite Fracture Characteristics and Hydraulic Fracturing Behavior of Hard Rock." Applied Sciences 14, no. 6 (2024): 2585. http://dx.doi.org/10.3390/app14062585.

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To investigate the influence of non-singular terms (T stress) in the stress field on the composite fractures of hard rock Type I–II, such as rock splitting failure and hydraulic fracture propagation, this study focused on hard rocks in metallic mines. Through splitting tests and hydraulic fracturing experiments, the impact of T stress on the characteristics of Type I–II composite fractures in hard rocks was analyzed. Utilizing the generalized maximum tangential (GMTS) stress criterion considering T stress, the stress intensity factors of hard rock Type I–II composite fractures with different p

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Lyu, XianZhou, Zenghui Zhao, Xiaojie Wang, and Weiming Wang. "Study on the Permeability of Weakly Cemented Sandstones." Geofluids 2019 (January 15, 2019): 1–14. http://dx.doi.org/10.1155/2019/8310128.

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Fractured rocks are a type of complex media that widely exist in various projects including energy, hydraulic, and underground space engineering, whose permeability properties are a hotspot in current rock mechanics domain. Aiming at investigating the seepage characteristics of the fracture surfaces in different rock strata, uniaxial compressive test and permeability test were performed on single-fracture homogenous and heterogeneous rocks. Specifically, rock’s physical and mechanical parameters were measured in uniaxial tests while the initial width of the single fracture was determined throu

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Zhang, Bochao, Lixin Wang, and Jianming Liu. "Finite Element Analysis and Prediction of Rock Mass Permeability Based on a Two-Dimensional Plane Discrete Fracture Model." Processes 11, no. 7 (2023): 1962. http://dx.doi.org/10.3390/pr11071962.

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The safety of underground engineering projects is significantly influenced by groundwater. One of the key complexities is identifying the primary seepage paths within underground rock formations, understanding the patterns of seepage, and determining the effects of fracture parameters on the fluid movement inside the rock mass. To address these issues, a probabilistic model is constructed for random fractures using the finite element method, reflecting the random nature of fracture distributions in the real world. This model allows for an in-depth examination of the distribution of pore water

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16

Li, Zhaolin, Lianguo Wang, and Wenshuai Li. "Mechanical Behavior and Fracture Characteristics of Rock with Prefabricated Crack under Different Triaxial Stress Conditions." Minerals 12, no. 6 (2022): 673. http://dx.doi.org/10.3390/min12060673.

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In this study, the compression failure test of rock with prefabricated fractures under different true triaxial conditions is carried out by using the true triaxial electro-hydraulic servo test system. The traditional large number of fracture laws with prefabricated fissures are merged and attributed to the induction of intermediate principal stress. The test results show that the direction of σ2 has a significant effect on the deformation characteristics of the prefabricated fractured rock. The internal crack expansion direction is more random and the crack distribution is more extensive and c

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Shestopalov, V. M., and L. I. Petrenko. "FRACTURING AND PERMEABILITY OF CRYSTAL ROCKS AND THEIR FRACTURE ZONES, HYDROGEOLOGICAL ASPECT." Geological Journal, no. 2 (June 30, 2022): 46–70. http://dx.doi.org/10.30836/igs.1025-6814.2022.2.254153.

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Fractured rock aquifers are regarded as of particular scientific and practical interest because of their importance for underground water supply, energy storage and safety radioactive waste disposal. The study of fissure waters of crystalline rocks in the context of global warming to address issues of drinking water supply is highly relevant today. It has potential practical importance for the future.The sustainable use of groundwater in fractured rock aquifers requires a detailed knowledge of their hydraulic properties. The complexity of hydrogeological conditions in massive fractured rocks r

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18

Zhang, Yong, Lijia Zhong, Fan Pang, Peng Li, and Fengyin Liu. "Characteristics of Energy Dissipation in T-Shaped Fractured Rocks under Different Loading Rates." Sustainability 15, no. 18 (2023): 13695. http://dx.doi.org/10.3390/su151813695.

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T-shaped fractured rocks in the engineering rock mass with different inclination angles, quantities, and cross patterns will cause slope landslides, cavern collapse, roof fall, and other disasters under the action of external forces. Deformation evolution of the T-shaped fractured rock is also significant for monitoring the stability of rock engineering structures. In this paper, the compression test of T-shaped fracture specimens was carried out under different loading rates. By modulating both the fracture inclination angle and the loading rate, the attributes pertaining to energy dissipatio

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Zhang, Ying, Kai He, Jianming Yang, et al. "Mechanical, Seepage, and Energy Evolution Properties of Multi-Shaped Fractured Sandstone Under Hydro-Mechanical Coupling: An Experimental Study." Minerals 15, no. 3 (2025): 215. https://doi.org/10.3390/min15030215.

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Rocks with multi-shaped fractures in engineering activities like mining, underground energy storage, and hydropower construction are often exposed to environments where stress and seepage fields interact, which heightens the uncertainty of instability and failure mechanisms. This has long been a long-standing challenge in the field of rock mechanics. Current research mainly focuses on the mechanical behavior, seepage, and energy evolution characteristics of single-fractured rocks under hydro-mechanical coupling. However, studies on the effects of multi-shaped fractures (such as T-shaped fractu

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Sui, Qun, Weizhong Chen, and Luyu Wang. "Investigation of Nonlinear Flow in Discrete Fracture Networks Using an Improved Hydro-Mechanical Coupling Model." Applied Sciences 12, no. 6 (2022): 3027. http://dx.doi.org/10.3390/app12063027.

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Fractures commonly exist in rock masses; the coalescence of fractures provides fluid flow pathways in a fractured rock mass and greatly increases the flow capacity of fractured rock. This work aims to study the characteristics of nonlinear flow in fractures. A series of tests were conducted and indicated that the Forchheimer law performed well when describing the nonlinear relationship between hydraulic gradient and flow. The test results also indicate that higher water pressure may induce stronger nonlinearity. Additionally, the linear and nonlinear coefficients of the Forchheimer law increas

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Grigoryan, Ya S., and I. O. Bayuk. "Petroelastic modeling of carbonate reservoirs in the view of different void types." Proceedings of higher educational establishments. Geology and Exploration 63, no. 6 (2022): 58–65. http://dx.doi.org/10.32454/0016-7762-2020-63-6-58-65.

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Background. Fractures present in carbonate rocks facilitate fluid flow within void spaces. Each type of voids can have a different effect on rock elastic properties, which, in turn, allow the characteristics of voids to be estimated by assessing the velocity of elastic waves. In this paper, an effect of pores and fractures on the velocity of elastic waves is analyzed by petroelastic modeling. An example of solving an inverse problem is presented, involving the determination of fracture porosity and relative fracture opening using the data on elastic wave velocity and hydrocarbon reservoir dens

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Zhou, Xin, Jianping Chen, Yunkai Ruan, Wen Zhang, Shengyuan Song, and Jiewei Zhan. "Demarcation of Structural Domains in Fractured Rock Masses Using a Three-Parameter Simultaneous Analysis Method." Advances in Civil Engineering 2018 (December 6, 2018): 1–13. http://dx.doi.org/10.1155/2018/9358098.

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A structural domain represents a volume of a rock mass with similar mechanical and hydrological properties. To demarcate structural domains (or statistically homogeneous regions) in fractured rock masses, this study proposes a three-parameter simultaneous analysis method (3PSAM) that simultaneously considers rock fracture orientation, trace length, and aperture to evaluate statistical homogeneity between two regions. First, a 102-patch three-dimensional Schmidt net, which represents a new comprehensive classification system, is established to characterize rock fractures based on their orientat

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Somodi, Gábor, and Balázs Vásárhelyi. "Scale and Rock Type Dependency of Mórágy Granite Formation in the Aspect of Fracture Density." Geotechnics 5, no. 2 (2025): 34. https://doi.org/10.3390/geotechnics5020034.

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The geometry of rock mass fractures is typically characterized through geological and geotechnical investigations. Detailed descriptions of granitic host rock can yield valuable data for constructing fracture network models. However, significant discrepancies often arise between data representing the mechanical and hydraulic properties of rocks. At the study site, fracture geometry data were gathered through surface and underground surveying, borehole logging, and underground mapping. Three-dimensional photogrammetry was utilized alongside traditional rock mass classification methods (Q-system

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Dang, Hong-Lam, Duc Phi Do, and Dashnor Hoxha. "Effective Elastic and Hydraulic Properties of Fractured Rock Masses with High Contrast of Permeability: Numerical Calculation by an Embedded Fracture Continuum Approach." Advances in Civil Engineering 2019 (February 3, 2019): 1–21. http://dx.doi.org/10.1155/2019/7560724.

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In this work, the hydromechanical modeling of the fractured rock masses was conducted based on a new numerical simulation method named as embedded fracture continuum (EFC) approach. As the principal advantage, this approach allows to simplify the meshing procedure by using the simple Cartesian meshes to model the fractures that can be explicitly introduced in the porous medium based on the notion of fracture cells. These last elements represent the grid cells intersected by at least one fracture in the medium. Each fracture cell in the EFC approach present a continuum porous medium whose hydro

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Hong-Lam, DANG, and THINH Phi Hong. "A methodology of re-generating a representative element volume of fractured rock mass." Transport and Communications Science Journal 71, no. 4 (2020): 347–58. http://dx.doi.org/10.25073/tcsj.71.4.4.

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In simulation of fractured rock mass such as mechanical calculation, hydraulic calculation or coupled hydro-mechanical calculation, the representative element volume of fractured rock mass in the simulating code is very important and give the success of simulation works. The difficulties of how to make a representative element volume are come from the numerous fractures distributed in different orientation, length, location of the actual fracture network. Based on study of fracture characteristics of some fractured sites in the world, the paper presented some main items concerning to the fract

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Wang, Xiaolin, Liyuan Yu, and Hanqing Yang. "Correlations between Geometric Properties and Permeability of 2D Fracture Networks." Advances in Civil Engineering 2021 (January 25, 2021): 1–7. http://dx.doi.org/10.1155/2021/6645238.

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The equivalent permeability of fractured rock masses plays an important role in understanding the fluid flow and solute transport properties in underground engineering, yet the effective predictive models have not been proposed. This study established mathematical expressions to link permeability of 2D fracture networks to the geometric properties of fractured rock masses, including number density of fracture lines, total length of fractures per square meter, and fractal dimensions of fracture network structures and intersections. The results show that the equivalent permeability has power law

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Han, Xuefeng, Kangsheng Xue, and Shaojie Zhang. "The Behavior of Fluid Flow and Solute Transport in 3D Crossed Rock Fractures." Processes 13, no. 1 (2024): 67. https://doi.org/10.3390/pr13010067.

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Understanding the behavior of fluid flow and solute transport in fractured rock is of great significance to geoscience and engineering. The discrete fracture network is the predominate channel for fluid flow through fractured rock as the permeability of fracture is several magnitudes higher than that of the rock matrix. As the basic components of the fracture network, investigating the fluid flow in crossed fractures is the prerequisite of understanding the fluid flow in fractured rock. First, a program based on the successive random addition algorithm was developed to generate rough fracture

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Yang, Peiju, Shurong Zhang, and Changyou Liu. "Study on Shear Failure Process and Zonal Disintegration Mechanism of Roadway under High Ground Stress: A Numerical Simulation via a Strain-Softening Plastic Model and the Discrete Element Method." Applied Sciences 14, no. 10 (2024): 4106. http://dx.doi.org/10.3390/app14104106.

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Fracture expansion in rock masses can be observed by monitoring the break of contacts between the bounding particles via the discrete element method. The latter’s realization in this study via the PFC2D program tracked the evolution process of the zonal disintegration in an exemplary roadway-surrounding rock affected by mining. Besides, the damage evolution pattern in a high-stress soft rock roadway was simulated by the FLAC2D program using a strain-softening plastic model, revealing the effects of rock mass strength, stress state, and anchor support on the zonal disintegration of the roadway.

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Tan, Wenhui, and Pengfei Wang. "Experimental Study on Seepage Properties of Jointed Rock-Like Samples Based on 3D Printing Techniques." Advances in Civil Engineering 2020 (January 21, 2020): 1–10. http://dx.doi.org/10.1155/2020/9403968.

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Sample making of fractured rock mass is a big problem in rock mechanical test. The specimens prepared by traditional rock core drilling have some disadvantages such as unclear internal structure and great difference in mechanical properties; while, the samples prepared by inserting and seaming method have some other disadvantages such as hard to control the attitude of precast-joints, low accuracy. A method for preparing fractured rock-like samples based on 3D printing technology is introduced in this paper, and the seepage characteristics of fractured rock-like samples is studied by seepage e

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Stesky, R. M. "Electrical conductivity of brine‐saturated fractured rock." GEOPHYSICS 51, no. 8 (1986): 1585–93. http://dx.doi.org/10.1190/1.1442209.

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A theoretical analysis shows that electrical conductivity along fractures in a saturated porous rock is a function of many factors: fluid and rock conductivities, initial fracture aperture and contact area, fracture surface geometry (asperity height distribution and tip curvature), elastic moduli of the rock, and confining pressure or normal stress acting across the fracture. The conductivity in the fracture plane decreases approximately in proportion to log pressure, but the conductivity is influenced by the increased contact area, and hence flow‐path tortuosity, along the fracture surface at

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Cheng, Hua, Xiangyang Liu, Jian Lin, Liangliang Zhang, Mingjing Li, and Chuanxin Rong. "Study on Fracturing and Diffusion Mechanism of Nonslab Fracturing Grouting." Geofluids 2020 (August 12, 2020): 1–9. http://dx.doi.org/10.1155/2020/8838135.

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The coupling effect of a slurry and the fractured rock layer controls a spatial attenuation of the fracture channel width and grouting pressure from a grouting hole to the slurry top of fracture diffusion. This paper comprehensively considers the influencing factors such as the mechanical properties of the injected rock mass and the time-varying characteristics of the serous viscosity and introduces the control equation of the fracture channel width to establish a single-fracture nonslab fracturing grouting model. Combining the motion law of the slurry with the extension form of fracture, the

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Liu, Xiqi, Gang Wang, Zhijie Wen, et al. "The Transient Unloading Response of a Deep-Buried Single Fracture Tunnel Based on the Particle Flow Method." Sustainability 15, no. 8 (2023): 6840. http://dx.doi.org/10.3390/su15086840.

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Particle flow numerical simulation was used to reproduce the transient unloading process of a deep-buried single fracture tunnel. The influence of fracture characteristics on the transient unloading effect was analyzed from the aspects of stress state, deformation characteristics, fracture propagation, and energy conversion. The results shows that the surrounding rock stress field of the deep-buried tunnel is divided into four areas: weak stress area I, strong stress area II, stress adjustment area III, and initial stress area IV. The fracture has an important impact on the stress adjustment p

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Tran, Luat Khoa, and Stephan Konrad Matthai. "Simulation of the Infiltration of Fractured Rock in the Unsaturated Zone." Applied Sciences 11, no. 19 (2021): 9148. http://dx.doi.org/10.3390/app11199148.

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We study infiltration of rainwater into fractured rock and the accompanying capillary exchange processes between fractures and matrix, hereafter referred to as fracture–matrix transfer (FMT). Its influence on the velocity of the wetting front for uniform and variable aperture fractures is of prime interest because it determines the penetration depth of infiltration pulses. FMT is modelled explicitly in a discrete fracture and matrix (DFM) framework realised using a hybrid finite element–finite volume discretisation with internal boundaries. The latter separate the fracture mesh from the rock m

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Pang, Shuo, Alexey Stovas, and Huilin Xing. "Frequency-dependent anisotropy in partially saturated porous rock with multiple sets of mesoscale fractures." Geophysical Journal International 227, no. 1 (2021): 147–61. http://dx.doi.org/10.1093/gji/ggab204.

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SUMMARY Accurate modelling of the frequency-dependence of seismic wave velocity related to fracture system and fluid content is crucial to the quantitative interpretation of seismic data in fractured reservoirs. Both mesoscale fractures and patchy saturation effects can cause significant velocity dispersion and attenuation in the seismic frequency band due to wave-induced fluid flow (WIFF) mechanism. Considering the coupled impact of ‘mesoscale fractures’ and ‘patchy saturation’, we derive expressions for the frequency-dependent anisotropy in partially saturated porous rock containing two frac

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Wu, Na, Zhengzhao Liang, Yan Tao, Ting Ai, and Guijie Li. "Sensitivity Analysis of Fracture Geometry Parameters on the Mechanical Behavior of Rock Mass with an Embedded Three-Dimensional Fracture Network." Applied Sciences 12, no. 18 (2022): 9284. http://dx.doi.org/10.3390/app12189284.

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The existence of fractures has a significant influence on the mechanical properties of a rock mass. The sensitivity of the rock mass’s mechanical properties to the fracture’s geometric parameters is conducive to improving the measurement accuracy of fractured rock mass engineering. Firstly, the fracture geometric parameters in the dam site area of Lianghekou Hydropower Station were counted using the ShapeMetriX3D system. Then, the effect of the fracture’s geometric parameters on the deformation characteristics, failure mode, and mechanical parameters of the rock mass were investigated based on

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Weber, Samuel, Jan Beutel, Jérome Faillettaz, Andreas Hasler, Michael Krautblatter, and Andreas Vieli. "Quantifying irreversible movement in steep, fractured bedrock permafrost on Matterhorn (CH)." Cryosphere 11, no. 1 (2017): 567–83. http://dx.doi.org/10.5194/tc-11-567-2017.

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Abstract. Understanding rock slope kinematics in steep, fractured bedrock permafrost is a challenging task. Recent laboratory studies have provided enhanced understanding of rock fatigue and fracturing in cold environments but were not successfully confirmed by field studies. This study presents a unique time series of fracture kinematics, rock temperatures and environmental conditions at 3500 m a. s. l. on the steep, strongly fractured Hörnligrat of the Matterhorn (Swiss Alps). Thanks to 8 years of continuous data, the longer-term evolution of fracture kinematics in permafrost can be analyzed

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Strauhal, Thomas, and Christian Zangerl. "The Impact of Fracture Persistence and Intact Rock Bridge Failure on the In Situ Block Area Distribution." Applied Sciences 11, no. 9 (2021): 3973. http://dx.doi.org/10.3390/app11093973.

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The in situ block size distribution is an essential characteristic of fractured rock masses and impacts the assessment of rockfall hazards and other fields of rock mechanics. The block size distribution can be estimated rather easily for fully persistent fractures, but it is a challenge to determine this parameter when non-persistent fractures in a rock mass should be considered. In many approaches, the block size distribution is estimated by assuming that the fractures are fully persistent, resulting in an underestimation of the block sizes for many fracture geometries. In addition, the block

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Huang, Zhaoqin, Jun Yao, Yajun Li, Chenchen Wang, and Xinrui Lv. "Numerical Calculation of Equivalent Permeability Tensor for Fractured Vuggy Porous Media Based on Homogenization Theory." Communications in Computational Physics 9, no. 1 (2011): 180–204. http://dx.doi.org/10.4208/cicp.150709.130410a.

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AbstractA numerical procedure for the evaluation of equivalent permeability tensor for fractured vuggy porous media is presented. At first we proposed a new conceptual model, i.e., discrete fracture-vug network model, to model the realistic fluid flow in fractured vuggy porous medium on fine scale. This new model consists of three systems: rock matrix system, fractures system, and vugs system. The fractures and vugs are embedded in porous rock, and the isolated vugs could be connected via discrete fracture network. The flow in porous rock and fractures follows Darcy’s law, and the vugs system

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Yang, Dengke, Xiaoxiao Duan, Keyan Cheng, Lijun Xie, and Yongjun Song. "Research on creep characteristics of double fractured rock under freeze-thaw action." PLOS One 20, no. 5 (2025): e0320194. https://doi.org/10.1371/journal.pone.0320194.

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Open rock masses are subject to prolonged loading and freeze-thaw cycles in cold regions. In this study, we take saturated fissured red sandstone as object to investigate the long-term mechanical response characteristics of fractured rock under freeze-thaw conditions. Experimental tests were conducted to analyze the creep characteristics of the rock after freeze-thaw cycles, considering different freeze-thaw frequencies and fracture orientations. The results reveal that (1) freeze-thaw cycles exert a significant influence on the rock’s creep behavior, with axial strain, instantaneous strain, a

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Khodaei, Meysam, Ebrahim Biniaz Delijani, Mastaneh Hajipour, Kasra Karroubi, and Ali Naghi Dehghan. "Analyzing the correlation between stochastic fracture networks geometrical properties and stress variability: a rock and fracture parameters study." Journal of Petroleum Exploration and Production Technology 11, no. 2 (2021): 685–702. http://dx.doi.org/10.1007/s13202-020-01076-z.

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AbstractIn this study, the correlation between geometric properties of the fracture network and stress variability in a fractured rock was studied. Initially, discrete fracture networks were generated using a stochastic approach, then, considering the tensorial nature of stress, the stress field under various tectonic stress conditions was determined using finite-difference method. Ultimately, stress data were analyzed using tensor-based mathematical relations. Subsequently, the effects of four parameters including rock tensile strength, rock cohesion, fracture normal stiffness and fracture di

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Pan, Weidong, Suyu Liang, Peng Gao, Zhining Zhao, and Yupei Deng. "Study on Mechanical Properties of Fractured Sandy Mudstone Based on Triaxial Compression Experiment." Applied Sciences 14, no. 16 (2024): 7204. http://dx.doi.org/10.3390/app14167204.

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The technological requirements for mining are becoming more and more complex as underground coal mining depth increases. The issue that the concentration of mining stress causes an increase in the degree of rock fracture formation in the stope is one of them, and it has a significant impact on the mine’s production safety and efficiency. Using a pseudo-triaxial compression experimental platform, the effects of confining pressure on the strength, deformation, and fracture propagation route of fractured sandy mudstone were investigated in order to explore the mechanical characteristics of fractu

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FAN, L. F., X. W. YI, and G. W. MA. "NUMERICAL MANIFOLD METHOD (NMM) SIMULATION OF STRESS WAVE PROPAGATION THROUGH FRACTURED ROCK MASS." International Journal of Applied Mechanics 05, no. 02 (2013): 1350022. http://dx.doi.org/10.1142/s1758825113500221.

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The present work is devoted to the simulation of stress wave propagation through fractured elastic media, such as rock mass, by using the numerical manifold method (NMM). A single fracture is used to verify the capability and accuracy of the NMM in modeling fractured rock mass. The frequency-dependence on stress wave transmission across a fracture is analyzed. The influence of the fracture specific stiffness on the wave attenuation and effective wave velocity is discussed. The results from the NMM have a good agreement with those obtained from a theoretical displacement discontinuity method (D

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Ni, Lin, Xue Zhang, Liangchao Zou, and Jinsong Huang. "Phase-field modeling of hydraulic fracture network propagation in poroelastic rocks." Computational Geosciences 24, no. 5 (2020): 1767–82. http://dx.doi.org/10.1007/s10596-020-09955-4.

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Abstract Modeling of hydraulic fracturing processes is of great importance in computational geosciences. In this paper, a phase-field model is developed and applied for investigating the hydraulic fracturing propagation in saturated poroelastic rocks with pre-existing fractures. The phase-field model replaces discrete, discontinuous fractures by continuous diffused damage field, and thus is capable of simulating complex cracking phenomena such as crack branching and coalescence. Specifically, hydraulic fracturing propagation in a rock sample of a single pre-existing natural fracture or natural

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Xiong, Feng, Yijun Jiang, Chun Zhu, Lin Teng, Hao Cheng, and Yajun Wang. "A Coupled Darcy-Forchheimer Flow Model in Fractured Porous Media." Applied Sciences 13, no. 1 (2022): 344. http://dx.doi.org/10.3390/app13010344.

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Aiming at nonlinear flow in fractured porous media, based on the finite volume method, the discrete equations of Darcy flow in porous and Forchheimer flow in fracture were derived, and a solution method for coupling flow is proposed. The flow solution by the proposed method for single fracture and intersecting fracture is verified against Frih’s solution. Based on this method, nonlinear flow behavior for fractured rock deep-buried tunnels under high water heads was discussed. The results show that the hydraulic gradient of surrounding rock is characterized by “large at the bottom and small at

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Zhu, Zeqi, Lan Cui, Youkou Dong, Qian Sheng, Kaiwei Tian, and Zhenshan Guo. "A Novel Deformation Analytical Solution and Constitutive Model for Fractured Rock Masses." Journal of Marine Science and Engineering 11, no. 12 (2023): 2351. http://dx.doi.org/10.3390/jmse11122351.

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In order to study the deformation and stability of a fractured rock mass, existing research suggests that fracture deformation, which is usually obtained by evaluating the equivalent deformation modulus, dominates the deformation of a fractured rock mass. However, this parameter is difficult to obtain in theory and practice, which limits the application of rock mass deformation analysis methods. In order to calculate the deformation of fractured rock masses, the mass of the rock is regarded as a sponge-like material, and it is assumed that the deformation of a water-saturated fractured rock ma

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Han, Feng Shan, and Li Song. "Numerical Investigation for Fracture Saturation in Multilayer Sedimentary Rock in Unsymmetrical Case." Advanced Materials Research 690-693 (May 2013): 3050–53. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.3050.

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Opening mode fractures in multilayer sedimentary rock often are periodically distributed with fracture spacing scaled to the thickness of the fractured layer. In this paper, based on Rock Failure Process Analysis Code RFPA2D, a three layer model with a central layer and with the different thickness top and bottom layer, progressive formation in multilayer sedimentary rock at fracture saturation in unsymmetrical case is simulated. We investigate the change of the critical fracture spacing to layer thickness ratio as a function of the thickness of the top layer where the bottom layers is much th

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Boadu, Fred K., Joseph Gyamfi, and Emmanuel Owusu. "Determining subsurface fracture characteristics from azimuthal resistivity surveys: A case study at Nsawam, Ghana." GEOPHYSICS 70, no. 5 (2005): B35—B42. http://dx.doi.org/10.1190/1.2073888.

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We conducted azimuthal resistivity surveys (ARS) using the square-array configuration to characterize the subsurface fractured rock mass at selected farmland sites in Nsawam District, Ghana. This study is the first of its kind in Ghana, and it provides useful information for future hydrological studies of the area, where groundwater is suspected to be contaminated as a result of the indiscriminate use of pesticides and fertilizers by local farmers. We estimate the fracture orientation, fracture porosity, and coefficient of anisotropy of the fractured rock mass at the selected sites from the az

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Wu, Yuexiu, Quansheng Liu, Andrew H. C. Chan, and Hongyuan Liu. "Implementation of a Time-Domain Random-Walk Method into a Discrete Element Method to Simulate Nuclide Transport in Fractured Rock Masses." Geofluids 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/5940380.

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It is essential to study nuclide transport with underground water in fractured rock masses in order to evaluate potential radionuclide leakage in nuclear waste disposal. A time-domain random-walk (TDRW) method was firstly implemented into a discrete element method (DEM), that is, UDEC, in this paper to address the pressing challenges of modelling the nuclide transport in fractured rock masses such as massive fractures and coupled hydromechanical effect. The implementation was then validated against analytical solutions for nuclide transport in a single fracture and a simple fracture network. A

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Kang, Yong Shui, Quan Sheng Liu, Kai Shi, and Xiao Yan Liu. "Research on Modeling Method for Freezing Tunnel with Fractured Surrounding Rock." Advanced Materials Research 455-456 (January 2012): 1591–95. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.1591.

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The modeling method for freezing tunnel with fractured surrounding rock is discussed. Frost weathering of rock in cold regions poses serious threat to the stability of geotechnical engineering. Fracture in the freezing rock plays an important role in the mechanical features of the rock mass. However, most of the previous study on freezing rock considered the rock as continuous media, in which the effects of fracture are not reflected sufficiently. This paper overcomes the above-mentioned insufficient and considers the fracture as an important factor while modeling. The model of frost fracture

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Qi, Yingkai, Xuehua Chen, Qingwei Zhao, Xin Luo, and Chunqiang Feng. "Seismic wave modeling of fluid-saturated fractured porous rock: including fluid pressure diffusion effects of discretely distributed large-scale fractures." Solid Earth 15, no. 4 (2024): 535–54. http://dx.doi.org/10.5194/se-15-535-2024.

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Abstract. The scattered seismic waves of fractured porous rock are strongly affected by the wave-induced fluid pressure diffusion effects between the compliant fractures and the stiffer embedding background. To include these poroelastic effects in seismic modeling, we develop a numerical scheme for discretely distributed large-scale fractures embedded in fluid-saturated porous rock. Using Coates and Schoenberg's local-effective-medium theory and Barbosa's dynamic linear slip model characterized by complex-valued and frequency-dependent fracture compliances, we derive the effective viscoelastic

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