Numerical Simulation of Sliding Failure in Rock-Bolt Interface by Discrete Element Model

FANG Wei; SIMA Jun; JIANG Ming-jing

doi:10.11988/ckyyb.20161311

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Journal of Changjiang River Scientific Research Institute ›› 2018, Vol. 35 ›› Issue (5) : 73-78. DOI: 10.11988/ckyyb.20161311

ROCK-SOIL ENGINEERING

Numerical Simulation of Sliding Failure in Rock-Bolt Interface by Discrete Element Model

FANG Wei^1,2, SIMA Jun¹, JIANG Ming-jing^1,3

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Abstract

Researching the mechanical properties and failure mechanism of rock-bolt interface is of great significance since sliding between bolt and rock is a major failure form of anchorage system. With the microscopic bond
model proposed by one of the authors previously, the pull-out test of rock bolts was simulated using discrete element method (DEM). The complete load-displacement curves, the distribution of axial force and the interfacial shear stress were investigated, respectively. Furthermore, the microscopic failure mechanism of bolt-rock interface was analyzed according to the type and fabric of broken bonds. Research results are concluded as follows: 1) the simulated load-displacement curves were consistent with those from laboratory tests; 2) with the increase of anchor length, peak load value increased while average cohesive strength of anchor interface decreased; 3) progressive failure occurred in the anchor interface after pull load reached peak; 4) on macroscopic level, the failure of anchored segment exhibited as interface sliding; whereas on microscopic level, the failure manifested as the tensile failure of bonds near interface and the propagation of micro-cracks along the direction of axial force.

Key words

rock bolt / pull-out test / anchor interface / sliding failure / discrete element simulation

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FANG Wei, SIMA Jun, JIANG Ming-jing. Numerical Simulation of Sliding Failure in Rock-Bolt Interface by Discrete Element Model[J]. Journal of Changjiang River Scientific Research Institute. 2018, 35(5): 73-78 https://doi.org/10.11988/ckyyb.20161311

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