Numerical investigation of landslide kinetics for the recent Mabian landslide (Sichuan, China)

Jiang, Wei; Zhao, Zhou; Xu, Chong; Wen, Qiang

doi:10.1007/s10346-019-01237-0

Cited by 88 publications

(30 citation statements)

References 34 publications

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“…ese represent particles according to a specific contact model, and the macromechanical properties of the rock-soil mass are simulated via the movement of, and interactions between, the particles [44]. e interparticle interactions and particle motion are simulated using Newton's law of motion and the law of force-displacement.…”

Section: Pfc Methodmentioning

confidence: 99%

Numerical Study of Damage to Rock Surrounding an Underground Coal Roadway Excavation

Jiang

Wang

Zhao

et al. 2020

Advances in Civil Engineering

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In coal mines, underground roadways are required to transport coal and personnel. Such tunnels can become unstable and hazardous. This study simulates deformation and damage in the rock surrounding a shallow coal seam roadway using particle flow code. A numerical model of particle flow in the surrounding rock was constructed based on field survey and drilling data. Microcharacteristic indices, including stress, displacement, and microcrack fields, were used to study deformation and damage characteristics and mechanisms in the surrounding rocks. The results show that the stress within the rock changed gradually from a vertical stress to a circumferential stress pattern. Stress release led to self-stabilizing diamond-shaped and X-shaped tensile stress distribution patterns after the excavation of the roadway. Cracking increased and eventually formed cut-through cracks as the concentrated stress transferred to greater depths at the sides, forming shear and triangular-shaped failure regions. Overall, the roof and floor were relatively stable, whereas the sidewalls gradually failed. These results provide a reference for the control of rock surrounding roadways in coal mines.

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Section: Pfc Methodmentioning

confidence: 99%

Numerical Study of Damage to Rock Surrounding an Underground Coal Roadway Excavation

Jiang

Wang

Zhao

et al. 2020

Advances in Civil Engineering

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“…González et al (2002) indicated the following: (1) PFC can simulate the bonding and separation of rock, and (2) using the contact between wall elements and ball elements, PFC is able to simulate collisions and friction in landslide behavior. In recent years, the software has been widely used in slope deformation and motion process simulation (Feng et al 2016;Wei et al 2019 ).…”

Section: Simulation Verificationmentioning

confidence: 99%

The Evolution Mechanism of the Slope Toppling Deformation for Early-Warning Analysis

Pei

et al. 2021

Preprint

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With massive engineering projects performed in high and steep mountain areas, the evidence of toppling deformation, which has been an important engineering geological problem in construction, has been exposed and observed in quantities. Three key issues in the early warning of toppling slopes are the boundary condition, evolution mechanism, and deformation stability analysis. This paper investigates an evolution mechanism for timely predicting the occurrence of toppling induced slope failure in rock masses, relates boundary formation and progressive development about toppling fracture planes. By describing an instantaneous toppling velocity field and identifying two possible fracture plane geometries (linear and parabolic), the optimal path of toppling fracture plane is searched via critical toppling heights (i.e., minimum loads) calculation using the upper bound theory of limit analysis. It is interesting to find that no matter what the slope structures and mechanical parameters are, the optimal path of toppling fracture plane is straight and most likely oriented perpendicular to the bedding planes. Hereby, considering structural damage will enable progressive toppling deformation instead of systemic failure, the toppling deformation evolution is probably taking place of a loop following the formation of the first fracture plane due to exceeding slope critical height. In the loop, deformation and column inclination updates due to fracture plane formation and fracture plane inclination increase to adjust the changed inclination of columns, as it may take degrees perpendicular to columns. And this progressive formation of ever more inclined fractures plane is what lead to sliding collapse. Altogether we divide the toppling evolution into 5 stages, and define the instability criterion for toppling deformation transform into sliding collapse as the fracture plane inclination being equal to its friction angle. In addition, a PFC2D simulation of the entire slope toppling process is performed to verify this speculative evolution mechanism, and a satisfactory result is acquired. Finally, a deformation calculation model of toppling slopes is proposed for stability analysis in accordance with the instability criterion, which is further applied in a typical toppling case. The findings of this study could lay a foundation for the deformation, stability and early-warning analysis of toppling slopes.

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“…e force and displacement between particles are achieved through contact. Among them, the contact bond (CB) and parallel bond (PB) can be used to simulate the connection between rock particles; the PB not only transfers force but also transfers moment [46][47][48]. In this study, a uniaxial compression model of a specimen with hole defects was established using the parallel bonding method.…”

Section: Model Design and Determination Of Microparametersmentioning

confidence: 99%

Effect of Multiple Hole Distribution and Shape Based on Particle Flow on Rocklike Failure Characteristics and Mechanical Behavior

Xia

Ning

Yang

et al. 2020

Advances in Civil Engineering

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Based on the particle flow code, numerical models of vertical and horizontal orientations of holes with different shapes were established, and the effects of preexisting holes with different shapes and arrangement patterns on the mechanical behaviors and failure characteristics of rocklike materials were studied. The evolution trend of the stress field is discussed by taking a circular hole as an example. The results show that the existence of holes reduces the peak stress, peak strain, and elastic modulus of the sample, and different shapes of holes and different arrangement patterns have different effects on the mechanical properties and damage degree of the sample and significantly affect the horizontal orientation model. Before crack formation, the compressive stress and tensile stress concentration areas of each sample are located at the left and right ends and the upper and lower ends of the hole, respectively. After model failure, the compressive stress and tensile stress concentration areas of each sample are relatively scattered. In the vertical orientation model, the middle area of vertical holes is the main compressive stress concentration area, which is approximately “columnar” distribution. In the horizontal orientation model, the compressive stress concentration area between the holes is cross distribution and approximately “X” type distribution. The vertical orientation model sample forms a “columnar” distribution to bear the applied load with a more favorable bearing orientation.

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Numerical investigation of landslide kinetics for the recent Mabian landslide (Sichuan, China)

Cited by 88 publications

References 34 publications

Numerical Study of Damage to Rock Surrounding an Underground Coal Roadway Excavation

Numerical Study of Damage to Rock Surrounding an Underground Coal Roadway Excavation

The Evolution Mechanism of the Slope Toppling Deformation for Early-Warning Analysis

Effect of Multiple Hole Distribution and Shape Based on Particle Flow on Rocklike Failure Characteristics and Mechanical Behavior

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