Unsaturated seepage–stress–damage coupling and dynamic analysis of stability on discrete fractured rock slope

Wang, Shuhong; Yang, Tianjiao; Zhang, Ze; Sun, Zejun

doi:10.1007/s12665-021-09647-x

Cited by 11 publications

(3 citation statements)

References 48 publications

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“…Ma et al [110] introduced a density reduction process for typical discrete fracture network models by considering the correlation index, and the improved equivalent model based on different fracture structures was validated (see Figure 8). Wang et al [111] introduced the connected fracture network generated by MATLAB into COMSOL Multiphysics to establish a discrete fracture unsaturated seepage-stress-damage coupling model and verified the model by an example. ability can indeed be neglected, the study of seepage state and solute transport law in a small or specific area has incomparable advantages over equivalent continuous media.…”

Section: Fracture Network Modelmentioning

confidence: 99%

A Review of Hydromechanical Coupling Tests, Theoretical and Numerical Analyses in Rock Materials

Zhao

Liu

Lin

et al. 2023

Water

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The hydromechanical coupling behavior of rocks is widely present in the fields of rock mechanics and engineering studies. Analyzing and summarizing the relevant literature, the current status of experimental and coupling theory research on hydromechanical coupling is systematically described, the commonly used numerical simulation methods and their applications are briefly introduced, and the hydromechanical coupling problems in mining engineering, water conservancy, and hydropower engineering, slope engineering, tunneling engineering, and other fields are analyzed. Regarding the current status of studies on the hydromechanical coupling behavior of rocks, the test research aspect needs to further enhance the test studies on the triaxial shear permeability of rock material, and adopt a combination of macroscopic, fine, and microscopic methods to study the hydraulic coupling problems of rock materials from different scales. To couple theory, the traditional concepts are broken through, and new coupling theories and mathematical models are used to explain and solve the relevant practical problems. Meanwhile, the application of interdisciplinary approaches to solving coupling problems in the future is emphasized. In terms of numerical simulation and engineering applications, new large data algorithms are developed to improve the efficiency of simulation calculations. In addition, consideration should be given to the numerical simulation of coupling effects, the coupled rheological effects, and the coupled dynamic properties of rock masses under high-ground stress and high water pressure.

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Section: Fracture Network Modelmentioning

confidence: 99%

A Review of Hydromechanical Coupling Tests, Theoretical and Numerical Analyses in Rock Materials

Zhao

Liu

Lin

et al. 2023

Water

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“…arising between multi-type cracks (see crack distribution of point D in Fig. 17) (Wang et al 2021;Zhang et al 2007), which damages the specimen's continuity and leads to continuous reduction of inherent cohesion. Thus, the pseudo cohesion is reduced from cv, C to cv, D (since the pseudo cohesion has been completely mobilized at point C, the pseudo cohesion cv after C is equal to the maximum cohesion that the specimen can provide in real time).…”

Section: Meso-mechanism Analysis Of Sandstone Strength Parameter Evol...mentioning

confidence: 99%

A novel obtaining method and mesoscopic mechanism of pseudo-shear strength parameter evolution of sandstone

et al. 2023

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The pre-peak microstructure evolution of the material is crucial in determining the strength and failure scheme of the material, but is not captured by the existing shear strength parameters models which focus on post-peak stage information. Novel concepts of pseudo cohesion and pseudo internal friction angle that account for both the pre-peak and post-peak stage information were proposed in this study, based on the experimentally observed response of the rock mechanics parameters to an external load (the maximum principal stress). These two parameters were analytically derived as functions of maximum principal strain, with coefficients to be determined (i.e. by applying the Mohr-Coulomb criterion with these parameters to experimental data). The dependence of pseudo cohesion and pseudo internal friction angle on the axial strain and confining pressure were investigated. The evolution of the strength parameters was found to relate to the propagation of micro crack developed in the loading process, as revealed by PFC 2D simulations reproducing experiments. The results show that (1) analytical model characterizing the pseudo cohesion and internal friction angle as the quadratic function of axial strain accurately reflects the mechanical response characteristics of the specimen; (2) before the residual stage, the pseudo cohesion first increases and then decreases with increasing strain, while the pseudo internal friction angle increases continuously; (3) for the sandstone specimens studied, the pseudo cohesion at the peak stress increases by a gradually decreasing rate with increasing confining pressure, while the pseudo internal friction angle at the peak stress decreases by a decreasing rate with the increasing confining pressure; (4) CPM well characterized the mechanical properties of rock under multiple confining pressures, as the total stress-strain curves and failure modes of numerical specimens reproduced the experimental results; (5) the evolution of rock pseudo shear strength parameters is closely related to the external load and the generation, propagation and penetration process of rock cracks. The rock pseudo shear strength parameters are gradually mobilized with the increasing load, and the propagating of cracks owing to the decrease of mobilizable maximum cohesion and the increase of mobilizable maximum internal friction angle.

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“…The rock mass on the bank slope often has a large number of microscopic or macroscopic defects such as bedding, joints, and fissures. The existence of defects in the rock mass greatly affects the stress field, seepage field, and chemical field inside the rock mass structure (Miao et al, 2018;Wang et al, 2021). It often controls the stability of the entire rock mass structure, and once instability occurs, the resulting disaster will be catastrophic (Du et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Shear performance and reinforcement mechanism of MICP-treated single fractured sandstone

Xiao

Deng

et al. 2022

Front. Earth Sci.

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There are a large number of fractured rock masses in the Three Gorges Reservoir area. Traditional reinforcement methods have disadvantages such as large engineering investment, high material consumption, and poor ecological environmental protection. Therefore, it is necessary to develop new environmentally friendly materials and methods to strengthen and control them. The microbial-induced carbonate precipitation (MICP) technology that has emerged in recent years has the characteristics of low carbon and environmental protection and has great prospects in the restoration and reinforcement of rock and soil materials. Therefore, Bacillus cereus extracted in situ from the Three Gorges Reservoir area is proposed to be used for MICP reinforcement of single-fractured sandstone, and its reinforcement mechanism is revealed by studying the macroscopic impermeability and shear performance improvement of the fractured rock sample after reinforcement, and the microstructure changes. The results show that after 10 cycles of grouting reinforcement, the fracture surface of the rock sample is well sealed, the permeability coefficient is reduced by two orders of magnitude, the shear stress is increased by 26%–40%, and the shear stiffness is increased by 70%. The shear stress–shear displacement curve shows the peak shear strength, and the residual shear strength also increases to a certain extent. The MICP process improves the mechanical properties of fractured rock samples from three aspects, namely, the cementation between sand grains and the fracture surface, the cementation effect between sand grains, and the filling effect of fractured rock samples. The shear failure surface of the samples after reinforcement is the recheck interface between the cementation body and the cementation interface. The relevant research results can provide references for the MICP reinforcement technology of fractured rock mass.

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Unsaturated seepage–stress–damage coupling and dynamic analysis of stability on discrete fractured rock slope

Cited by 11 publications

References 48 publications

A Review of Hydromechanical Coupling Tests, Theoretical and Numerical Analyses in Rock Materials

A Review of Hydromechanical Coupling Tests, Theoretical and Numerical Analyses in Rock Materials

A novel obtaining method and mesoscopic mechanism of pseudo-shear strength parameter evolution of sandstone

Shear performance and reinforcement mechanism of MICP-treated single fractured sandstone

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