Slope Stability Analysis to Correlate Shear Strength with Slope Angle and Shear Stress by Considering Saturated and Unsaturated Seismic Conditions

Khan, Muhammad Israr; Wang, Shuhong

doi:10.3390/app11104568

Cited by 16 publications

(8 citation statements)

References 32 publications

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“…Over time, the literature has been enriched with numerous methods for stability analyses, developed by academics and researchers in the field, among which we mention: methods based on the limit equilibrium concept [1][2][3][4][5][7][8][9][10]; methods based on finite element/difference method [3,4,[7][8][9][10]12,13,49] (which is a modern and accurate one, able to be applied to complex structures); methods based on 3D analyses [29,40,41,[50][51][52][53][54] (for slopes with complex geometries, partially loaded, with variable structure, having a well-defined failure mechanism and assuming the addition of the third dimension in 2D models); probabilistic methods [55][56][57][58] (implies probabilistic analysis and processing of the physical-mechanical properties of the rocks and probabilistic computation by analytical or numerical methods); methods using Fuzzy logic [59][60][61][62][63] Considering the positive influence that lignite can exert on the stability reserve, due to its superior resistance characteristics compared to the surrounding (waste) rocks, Table 5 presents a situation regarding the position occupied by the lignite layers in relation to the slopes (existing, as of May 2023, and designed at the end of 2023). Next, in the model made with the help of the specialized software Slide (Figure 10), the values of the physical and mechanical characterist...…”

Section: Results Of the Stability Analysesmentioning

confidence: 99%

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Verifying the Stability of the Working Fronts of Lignite Open Pits Developed in Hilly Areas—A Case Study of Jilț North Open Pit (Romania)

Faur,

Lazar,

Apostu

et al. 2023

Applied Sciences

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Regardless of the period for which the lignite open pits from Romania will be kept in function, operational safety is an objective of utmost importance. In this context, the present paper aims to analyze the stability of the working fronts of a lignite open pit from Romania (Jilț North open pit). The development of Jilț North open pit involves excavations in a hilly area, with a level difference between the base of the open pit and the top of the hill of approx. 195 m (151 m by the end of 2023). Thus, based on the technical documentation provided by the mining operator (situation plan, cross-sections, stratigraphic columns, etc.) and laboratory tests (on the physical–mechanical characteristics of the rocks), a stability analysis model was created with the help of a specialized software. Following the analyses, it was found that two of these slopes (T1 and T3 steps) do not present a sufficient stability reserve (in fact they are unstable, Fs ˂ 1), to allow continuing extractive activities under safe conditions. Considering these results and using a well-known slope dimensioning method, two technical solutions were proposed to increase the stability reserve: a simple one, for the T3 step, which involves reducing the slope angle from 52° to 45°, and the second one, for the T1 step, a bit more complex, involving the inclusion in the general continuous flux of the open pit of a discontinuous sub-flux that aims to achieve three sub-steps, and the reduction in the general slope angle.

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Section: Results Of the Stability Analysesmentioning

confidence: 99%

“…The main target of a stability study is to evaluate the safety factor (coefficient) or to verify the stability reserve of a slope and, on this basis, to mitigate the geotechnical risks that may occur by identifying and implementing the appropriate stabilization measures [3,5,13,14,41].…”

Section: Introductionmentioning

confidence: 99%

Verifying the Stability of the Working Fronts of Lignite Open Pits Developed in Hilly Areas—A Case Study of Jilț North Open Pit (Romania)

Faur,

Lazar,

Apostu

et al. 2023

Applied Sciences

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“…(1) In the reduction method considering the internal friction angle and cohesion of mesoscopic joints between blocks in the BBM-DFN model (CF-RM), failure of a highsteep scarp is mainly shown as shear failure along the joint planes in rock. Khan Muhammad Israr et al [42] suggested considering the trend of safety factor variation with changes in shear strength when analyzing slope stability. (2) The reduction method considering internal friction angle, cohesion, and tensile strength of mesoscopic joints between blocks in the BBM-DFN model (CFT-RM) holds that failure of rock in actual high-steep scarp engineering is compression-shear combined failure, so the tensile strength parameter of joints is incorporated into the reduction parameters.…”

Section: Strength Reduction Methods For Collapse Based On the Bbm-dfn...mentioning

confidence: 99%

A Numerical Method for Evaluating the Collapse of High-Steep Scarp Slopes Based on the Bonded Block Model–Discrete Fracture Network Model

Sun,

Qiu,

Yan

et al. 2023

Sustainability

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Geotechnical engineering works in deep-incised valleys or open-pit mining areas often encounter high-steep scarp slopes with a slope angle greater than 75°. This type of slope directly threatens the safety of construction personnel, so assessing their stability is essential to ensure construction safety. The natural geometry of high-steep scarp slopes possesses complexity in terms of geometric morphology, structural features of rock mass, and occurrence mechanisms of collapse. There is little research and less emphasis on the evaluation of the collapse risk of high-steep scarp slopes. In particular, the fracture of intact rock or rock bridges is generally ignored in the analysis of collapse processes. A bonded block model (BBM)–discrete fracture network (DFN) coupling characterization model for the high-steep scarp slope is proposed based on a high-steep scarp slope containing dominant joint sets on the left bank of the dam site of the Huangzangsi Water Conservancy Project (Qinghai Province, China). By using the model, the complex geometric forms of the surface of the high-steep scarp slope are quantified, and the fracture process of falling rock masses as well as the controlling effect of dominant joints on the collapse of the scarp slope are revealed. A strength reduction method based on the BBM–DFN model is constructed, and the safety factor of the collapse-prone scarp slope is evaluated. The research results show that (1) the BBM–DFN model can be used to describe the local collapse process; (2) the occurrence of dominant joints plays an important part in controlling the collapse process; (3) there are differences in the safety factor of the scarp slope with different coupling methods; the collapse and failure modes also differ. For safety considerations, the safety factor of the scarp slope on the left bank of the dam site area is determined to be 1.85. The research findings can be used to guide the safety assessment of high-steep scarp slopes and the formulation of both collapse risk prevention and control measures to ensure construction safety in high-steep scarp slope areas.

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“…In general, slope static stability analysis has matured, but due to the complexity of research on the mechanism of tensile cracks, stability analysis of slopes with cracks should be explored in much more detail systematically. A series of studies has shown that the failure surface of slope is a tensile-shear coupling failure surface, and the results of stability have also demonstrated the rationality of the analysis method [3][4][5][6][7][8]. However, in the process of slope stability analysis, for complex slip surface, how to determine the ultimate depth of tensile crack has become a prominent issue.…”

Section: Introductionmentioning

confidence: 99%

Research on Fracture Mechanism and Stability of Slope with Tensile Cracks

Chen

Wang

2022

Applied Sciences

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Tensile cracks at the crest of slope will attenuate the stability of slope. The aim of this paper is to investigate the computation of safety factors acting on a clay slope when the slip surface consists of tensile crack and shear surface. Based on the theory of limit equilibrium, an analytical solution for safety factors containing three types of failure mechanisms is presented. The optimal crack depth was obtained by using the principle of minimum safety factor. In the solution, effects of parameters such as crack depth, slope angle, height, cohesion, and internal friction angle on slope stability were discussed. By comparing with the results of previous studies, the rationality of the proposed approach was verified. Results show that consideration of tensile cracks lead to a significant reduction in slope stability, and the safety factor decreases by about 10% compared with the slope without cracks. The law of safety factor varying with crack depth indicates that it first decreases as the crack depth is increased and then increases as the crack depth is further increased. Through the parametric analysis, it is found that the safety factor increases with an increase in cohesion and internal friction angle but decreases with the slope angle and height increase. It is important to note that the optimal crack depth does not exceed one-third of the slope height. Moreover, a highway landslide that occurred in the road running across the Yunnan and Tibet Province was investigated to verify the practicality of the present method.

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Slope Stability Analysis to Correlate Shear Strength with Slope Angle and Shear Stress by Considering Saturated and Unsaturated Seismic Conditions

Cited by 16 publications

References 32 publications

Verifying the Stability of the Working Fronts of Lignite Open Pits Developed in Hilly Areas—A Case Study of Jilț North Open Pit (Romania)

Verifying the Stability of the Working Fronts of Lignite Open Pits Developed in Hilly Areas—A Case Study of Jilț North Open Pit (Romania)

A Numerical Method for Evaluating the Collapse of High-Steep Scarp Slopes Based on the Bonded Block Model–Discrete Fracture Network Model

Research on Fracture Mechanism and Stability of Slope with Tensile Cracks

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