Prediction of the Shear Failure of Opened Rock Fractures and Implications for Rock Slope Stability Evaluation

Li, Yingchun

doi:10.1155/2019/6760756

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…With the progress of theory and technology, many scholars have carried out research on the heterogeneous characteristics, mechanical properties, and failure mechanisms of freeze-thaw rock using theoretical research, laboratory tests, and numerical simulation and have gained some research achievements [5][6][7][8][9][10]. The constitutive model of rock is closely related to the mechanical properties of rock.…”

Section: Introductionmentioning

confidence: 99%

Study on Freezing-Thawing Failure Process of Natural Damage Sandstone Based on Cellular Automata

Liu

Huang

et al. 2022

Geofluids

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Natural damage such as internal cracks, pores, and discontinuous surfaces of rocks induces the formation, expansion, and interaction of mesofractures until macroscopic failure under the action of freeze-thaw and load. The failure process is the evolution of self-organization and has localization characteristics. The CT scanning test of sandstone with different freezing and thawing cycles was carried out. According to the theory of cellular automata analysis, combined with CT image processing technology, the numerical model of the mesostructure of the sandstone constructed with natural damage, and the numerical simulation test of the Brazilian splitting failure of natural damage sandstone was completed under freezing and thawing. The results show that the combination of CT image processing technology and CASRock numerical simulation software can dynamically describe the whole process of initial damage propagation, new crack generation, and penetration of rock containing natural damage under tension in a freeze-thaw environment. Due to random and disordered natural damage inside the rock, gradually changing to an orderly state under freezing and load, the rock shows discontinuous deformation after the plastic deformation reaches a certain degree and gathers at the initial damage expansion. The fracture process of natural damaged rock under freezing and load has continuous-discontinuous deformation characteristics. The existence of initial rock damage causes the rock’s localized deformation and failure characteristics. The form and size of the initial damage determine the direction of development of the surface of the sandstone fracture and the coalescence of the crack. The initial damage area of sandstone is expanded due to the freeze-thaw cycle. After loading, the local deformation and failure characteristics caused by initial damage have delay characteristics for penetration of the main cracks in the sandstone, which determines the formation and development direction of secondary cracks in the rock failure process.

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Section: Introductionmentioning

confidence: 99%

Study on Freezing-Thawing Failure Process of Natural Damage Sandstone Based on Cellular Automata

Liu

Huang

et al. 2022

Geofluids

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“…Sandstones usually contain joints, which when penetrated cause slope movement due to the slope sliding along the joints. e friction coefficient of rock joints is closely related to the stability of the slope [1][2][3][4][5], though it is difficult to predict as it is associated with several geometrical and mechanical properties, such as surface roughness and asperity strength. When joint is subjected to repeated shearing during the slope sliding process, it becomes more difficult to predict any variations of the friction coefficient [6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Variation of Friction Coefficient of Sandstone Joint in Sliding

Zhao

Wang

Zhao

et al. 2020

Advances in Civil Engineering

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The friction coefficient of rock joints is closely related to the stability of the slope. However, it is difficult to predict the friction coefficient due to the influence of surface roughness and mechanical properties of rocks. In this study, we use a method that combines theoretical analysis with a sandstone sliding friction test and propose a model to predict the friction coefficient of Sandstone Joint. A sandstone sliding friction test was performed on a self-made reciprocating sliding friction test device. Good agreement between the estimated values and test values verified the validity of the friction coefficient prediction model. Through an analysis of the friction coefficient in sandstone sliding, it was established that the larger the wear mass, the larger the friction coefficient in sliding, and the larger the wear area, the smaller the friction coefficient. With the cycles increasing of sandstone, the friction coefficient gradually decreased before finally reaching a stable value. Comparisons between the estimated value and test results showed that when the wear difference coefficient c = 2.0 and the meshing friction amplification coefficient K = 1.4, the minimum error was 2.89%. The results obtained are significant in the control of slope sliding.

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“…e thickness of topsoil with the minimum ratio of rock and loading in Niushan Coal Mine is only 30 m, which is less than the minimum height of the unloading arch, failing to form the structures of "voussoir beam" or "stress arch" [2,3]. Because of the special ground control, the roof cutting and support crushing accidents happen easily in the mining [4,5], which poses a serious threat to the production. e clarification of the structural form, components, and mechanical characteristics of the overlying strata during coal extraction under different geological conditions is the core of ground pressure and strata control [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Modeling of Roof Fracture Instability Mechanism and Its Control in Top‐Coal Caving Mining under Thin Topsoil of Shallow Coal Seam

Gong

Zhao

Yetilmezsoy

et al. 2019

Advances in Civil Engineering

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This study aimed to explore the safe and efficient top-coal caving mining under thin topsoil of shallow coal seam (SCS) and realize the optimization of hydraulic support. Numerical simulation and theoretical analysis were used to reveal the stress distribution of the topsoil, the structure characteristics of the main roof blocks, and the development of the roof subsidence convergence. Step subsidence of the initial fractured main roof after sliding destabilization frequently existed, which seriously threatened the safety of the hydraulic supports. Hence, a mechanical model of the main roof blocks, where the topsoil thickness was less than the minimum height of the unloading arch, was established, and the mechanical criterion of the stability was achieved. The working resistance of the hydraulic support was calculated, and the reasonable type was optimized so as to avoid crushing accident. Findings of the present analysis indicated that the hydraulic support optimization was mainly affected by fractured main roof blocks during the first weighting. According to the block stability mechanical model based on Mohr–Coulomb criterion, the required working resistance and the supporting intensity were determined as 4899 kN and 0.58 MPa, respectively. The ZZF5200/19/32S low-position top-coal caving hydraulic support was selected for the studied mine and support-surrounding rock stability control of thin-topsoil SCS could be achieved without crushing accident.

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Prediction of the Shear Failure of Opened Rock Fractures and Implications for Rock Slope Stability Evaluation

Cited by 4 publications

References 40 publications

Study on Freezing-Thawing Failure Process of Natural Damage Sandstone Based on Cellular Automata

Study on Freezing-Thawing Failure Process of Natural Damage Sandstone Based on Cellular Automata

Analysis of the Variation of Friction Coefficient of Sandstone Joint in Sliding

Mechanical Modeling of Roof Fracture Instability Mechanism and Its Control in Top‐Coal Caving Mining under Thin Topsoil of Shallow Coal Seam

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