Deformation Mechanism and Stability of a Rocky Slope

Huang, Runqiu; Hu, Xiao; Ju, Nengpan; Zhao, Jianjun

doi:10.1016/s1002-0705(07)60021-1

Cited by 17 publications

(12 citation statements)

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“…After excavation and unloading, the slope of the open-pit mine breaks the original mechanical equilibrium of the slope, and a new mechanical equilibrium system gets established after constant adjustment of stress and displacement. During the excavation of the slope rock mass, a horizontal outward tensile stress is produced due to the rebound deformation of the rock mass, and it gradually decreases from outward to inward (Huang et al, 2007;Wang et al, 2022). Slope mass can generally be divided into three areas according to the adjustment and variation of the stress and displacement in the mass failure, as shown in Figure 1: ① the strong unloading area (broken area, Ⅰ); ② the weak unloading area (plastic area, II); and ③ the original rock stress zone (III); the original rock stress zone (III) is not affected by slope excavation disturbance.…”

Section: Introductionmentioning

confidence: 99%

Failure mechanism and stability analysis of an open-pit slope under excavation unloading conditions

et al. 2023

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Excavation unloading significantly contributes to rock slope failure in an open-pit mine. At present, there is no relevant theoretical study on the failure mechanism of the rock slope under excavation unloading. Therefore, in this study, based on the theory of fracture mechanics, the expression of the stress intensity factor at the crack tip on the rock mass at the vertical distance, h, from the slope top under excavation unloading is derived, the calculation method of the crack initiation angle is given, the expression of the ultimate safe height of the slope under unloading is obtained, and the ratio of the fracture toughness of the slope rock mass to the composite stress intensity factor at the crack tip on the rock mass is defined as the slope stability factor, which is verified by an engineering example. The results show that the crack initiation angle decreased when crack inclination was increased, and the crack initiation angle increased when the side-pressure coefficient, slope angle, and friction coefficient were increased. The ultimate safety height of the slope decreased first and then increased with the increase in the crack angle, and it was approximately linear with the crack length and inversely proportional with the slope angle. The stability coefficient calculated by this method is the same as that calculated by the limit equilibrium method and is small, which indicates the accuracy and rationality of this method. Results in this study can provide a theoretical basis for understanding and controlling the slope collapse disaster induced by excavation unloading.

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Section: Introductionmentioning

confidence: 99%

Failure mechanism and stability analysis of an open-pit slope under excavation unloading conditions

et al. 2023

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“…Among the many landslide-inducing factors, weak interlayers are one of the most prominent (Huang et al, 2007). The slope with weak interlayers is a common geological body.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Dynamic Response and Failure Modes of Rock Slopes with Weak Interlayers Using Continuum-Discontinuum Element Method

et al. 2021

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In order to better understand the dynamic response and failure modes of rock slopes containing weak interlayers subjected to earthquake excitation, a series of numerical simulations were carried out using the continuum-discontinuum element method (CDEM), considering the influence of seismic amplitude and weak interlayers inclination. The seismic response characteristics of slopes were systematically analyzed according to the waveform characteristics, amplification effect, equivalent crack ratio, etc. The numerical results show that the acceleration waveform characteristics and peak ground displacement (PGD) amplification coefficient have good correspondence with the dynamic failure process of landslides. Comprehensive analysis of waveform characteristics and PGD amplification coefficient can determine the damage time, damage location, and damage degree of landslides. The landslide process can be divided into three stages according to the equivalent crack ratio: rapid generation of a large number of microcracks, expansion and aggregation of microcracks, and penetration of micro-cracks and the formation of slip surfaces. The equivalent crack ratio provides a new idea for evaluating slope stability. In addition, under the combination of different amplitudes and weak interlayers, these earthquake-induced landslides exhibit different failure modes: the failure of the gentle-dip slope is mainly local rockfall; The mid-dip and steep-dip slopes with small amplitudes experience “tensile cracking-slip-collapsing” failure; The steep-dip slopes under strong earthquake failed in the form of “tensile cracking-slip-slope extrusion-collapsing”. The research results are of great significance for a deeper understanding of the formation mechanism of rock landslides with weak interlayers and the prevention of such landslide disasters.

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“…e stability of high rock slopes constitutes the most important engineering geological and geotechnical problem for large-scale water conservancy and hydropower projects [18][19][20][21]. e stability control has become a significant key technology for the success or failure of water conservancy and hydropower projects, both affecting and restricting the development of hydropower resources as well as the construction of hydropower projects [22,23].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis and Deformation Mechanism Study on an Excavated High‐Steep Slope of a Hydropower Station

Shi

Wang

et al. 2020

Advances in Civil Engineering

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The high-steep rock slope stability is one of the key technologies in the construction of water conservancy and hydropower projects, which affects and restricts the development of hydraulic resources and the construction of hydropower projects. In this paper, a three-dimensional numerical model was built incorporating stratigraphy, geological structures, and the inverted rock mechanical parameters to perform displacement, stress, and plastic zone analyses for an excavated slope in China using the FLAC3D software. The numerical simulation results after slope excavation show that the deformation near the fault fracture zone is the largest, ranging from 350 mm to 380 mm. The compressive stress is concentrated on the slope foot and the connecting part, the stress value is 2 MPa∼5 MPa, there is a large tensile stress area in the slope, and the tensile stress value is 0 MPa∼0.4 MPa. The plastic zone of the slope is concentrated near the fault F6 and the structural influence zone, and the rock mass of the slope basically enters the plastic state. On this basis, the deformation mechanism of slope was analyzed, while the internal and external factors affecting the slope deformation were described in detail. This work would provide an effective reference basis for slope stability evaluation and treatment of similar hydropower stations.

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Deformation Mechanism and Stability of a Rocky Slope

Cited by 17 publications

References 0 publications

Failure mechanism and stability analysis of an open-pit slope under excavation unloading conditions

Failure mechanism and stability analysis of an open-pit slope under excavation unloading conditions

Numerical Investigation on Dynamic Response and Failure Modes of Rock Slopes with Weak Interlayers Using Continuum-Discontinuum Element Method

Numerical Analysis and Deformation Mechanism Study on an Excavated High‐Steep Slope of a Hydropower Station

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