Step-path failure of rock slopes with intermittent joints

Huang, Da; Cen, Duofeng; Ma, Guowei; Huang, Runqiu

doi:10.1007/s10346-014-0517-6

Cited by 167 publications

(40 citation statements)

References 48 publications

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“…Understanding the laws governing the failure behavior of rock defects is the goal of in-depth research concerning failure and stability in significant rock engineering projects [2]. Many critical disasters in extensive rock engineering are caused by the expansion and interconnection of joints in the rock mass [3]. To achieve the safe and economical design of rock mass engineering systems, it is necessary to scientifically understand the mechanical characteristics and fracture evolution of rock mass.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior around double circular openings in a jointed rock mass under uniaxial compression

Lin

Cao

et al. 2020

Archiv.Civ.Mech.Eng

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To better understand the mechanical behavior in a jointed rock mass, a series of uniaxial compression tests were conducted on non-persistently jointed rock specimens with double circular holes. Acoustic emission (AE) and digital image correlation (DIC) techniques were applied to capture micro-crack events and real-time strain field evolution in the specimens. The results indicate that the existence of non-persistent joints has a significant influence on the strength characteristics of the specimens. Specifically, peak strength decreases at first and reaches a minimum at 30° then increases with increase in the joint dip angle. DIC technology has successfully monitored the development of surface strain fields. The fracture evolution process is comprehensively understood. Every sudden change in a strain field is usually accompanied by apparent AE events and stress-strain curves take the form of oscillations. The crack coalescence modes among joints can be summarized as six types and the crack coalescence patterns around holes and joints can be divided into three categories. These results are helpful to understanding further the mechanical properties and fracture mechanism of openings in non-persistently jointed rock masses.

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Section: Introductionmentioning

confidence: 99%

Mechanical behavior around double circular openings in a jointed rock mass under uniaxial compression

Lin

Cao

et al. 2020

Archiv.Civ.Mech.Eng

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“…Numerous nonpenetrating intermittent joints in the rock slope control the strength of the rock mass and the failure mode of the slope. High stress concentration at the end of the intermittent joint may lead to the initiation, propagation, and penetration of cracks in the rock bridge which may ultimately cause sudden instability and macroscopic failure of the slope, and the rock slope instability mechanisms occur not only along existing discontinuities but also as complex internal processes associated with shear or tensile fracture in the intact rock, particularly in massive natural rock slopes and deep engineered slopes [1][2][3]. Meso-mechanical knowledge regarding the crack evolution laws and interaction between cracks and intermittent joints in the rock mass have crucial significance in terms of the failure mechanism of open-pit rock slopes under excavation.…”

Section: Introductionmentioning

confidence: 99%

Parallel Offset Crack Interactions in Rock under Unloading Conditions

Zhou

Chen

2019

Advances in Materials Science and Engineering

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Rock slopes contain numerous nonpenetrating intermittent joints which maintain stability under excavation disturbance. The tip interaction coefficient (IC) of parallel offset double cracks in a typical rock mass under unloading conditions was calculated in this study based on the superposition principle and fracture mechanics to determine the meso-influence law of intermittent joint interaction in the slope under the action of excavation. The influence of many factors on the said interaction was also analyzed theoretically. Lateral unloading tests were conducted on rock-like specimens with parallel offset cracks in addition to RFPA2D numerical simulation and theoretical analysis. The results show that a smaller length of rock bridge or staggered distance between the cracks results in more severe and sensitive interactions at the crack tip. The Type I interaction strength of the tip of the crack is not affected by the inclination angle of the crack, but shear failure gradually weakens as the angle changes. The shear failure of the tip of the crack is more sensitive to changes in the inclination angle when the cracks are closer to each other; the change is the most intense when α is about 60°. Lateral unloading test and RFPA2D numerical simulation results are in close agreement with the theoretical analysis, which validates the theoretical results. The current study shows the interaction of the parallel offset cracks in rock under unloading conditions and is conducive to the study of the meso-failure mechanism of the jointed rock slope in an open-pit mine under the action of excavation.

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“…Besides the classical finite element method (FEM) and the finite difference method (FDM), diverse new numerical approaches have been proposed (Soga et al, 2016). Smooth particle hydrodynamics (Cascini et al, 2014) has been used to simulate channelized landslides of flow type; the material point method (Soga et al, 2016;Abe et al, 2013;Marcelo et al, 2016;Bandara et al, 2016) can describe the whole process of landslide movement using hydromechanical coupling; the discrete element method has been used to model the instability of jointed rock slopes (Dong et al, 2015;Huang et al, 2015); and the finite element method with Lagrangian integration points (FEMLIP; Cuomo et al, 2013) has been developed from the particle-in-cell method (Harlow, 1964;Moresi et al, 2002Moresi et al, , 2003 and satisfies the two requirements for simulating the complete evolution of landslides: precise tracking of internal variables and the ability to solve large displacements (Li et al, 2016(Li et al, , 2018a. In contrast to the material point method, the numerical weight of material particles used in the FEMLIP method is updated at each time step, leading to an acceptable calculation cost, owing to the use of an implicit solver (Li et al, 2018a).…”

Section: Introductionmentioning

confidence: 99%

Real-time monitoring and FEMLIP simulation of a rainfall-induced rockslide

Tao

Jiang

et al. 2019

Nat. Hazards Earth Syst. Sci.

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Rockslides are a common and devastating problem affecting mining and other engineering activities all over the world; consequently, there have been many studies into their prediction and prevention. This study focused on a recent rockslide in an open-pit mine in Liaoning Province, China. The stability of the rock slope under excavation and rainfall conditions was monitored using an efficient real-time monitoring system. A further numerical analysis was performed using the finite element method with Lagrangian integration points (FEMLIP), and two forms of the normalized global second-order work were calculated to analyze the stability of the rock slope. In fact for the future it would be very interesting to compare measurements and simulations in real time, and not only to develop back computations after failure. The numerical results indicate that the rock slope remained stable during excavation, yet lost stability after subsequent rainfall. Water infiltration, along with a major geological discontinuity, degraded the strength of the weak zone and induced the rockslide. The monitoring approach presented its robustness and generality, and was worth being generalized. The numerical approach proposed the evolution of the safety factor, the monitoring data were compared, and the mechanism of the rockslide was determined. It could be used as an assistant tool for disaster prediction.

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Step-path failure of rock slopes with intermittent joints

Cited by 167 publications

References 48 publications

Mechanical behavior around double circular openings in a jointed rock mass under uniaxial compression

Mechanical behavior around double circular openings in a jointed rock mass under uniaxial compression

Parallel Offset Crack Interactions in Rock under Unloading Conditions

Real-time monitoring and FEMLIP simulation of a rainfall-induced rockslide

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