Particle Flow Simulation of Failure Process in Single Fissured Sandstone Under True Tri-axial Compression

doi:10.12068/j.issn.1005-3026.2019.11.024

Abstract

Abstract: A series of numerical simulations were conducted to analyze the crack propagation and failure mechanism of sandstone with an inner single fissure under true tri-axial compression by using the particle flow code. The effects of different intermediate principal stresses on the crack propagation and failure mechanical properties of fissured sandstone are discussed. Results show that under true tri-axial compression， the intermediate principal stress contributes to the increasing of the peak strength of the fissured sandstone， while a higher intermediate principal stress can accelerate the crack propagation thus form macroscopic fracture in the sandstone sample. When the direction of the intermediate principal stress is consistent with the strike of the inner-fissure， a shear fracture can form in the direction of the fissure strike. The failure of the fissured sandstone under true tri-axial compression is mainly the shear failure accompanied by tensile failure.

Key words: true tri-axial compression, crack propagation, particle flow code, fissured sandstone

CLC Number:

TU45

JIA Peng， ZHANG Yao， LIU Dong-qiao， ZHANG Ya-bing. Particle Flow Simulation of Failure Process in Single Fissured Sandstone Under True Tri-axial Compression[J]. Journal of Northeastern University Natural Science, 2019, 40(11): 1654-1659.

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