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Volume 55 Issue 4
Jul.  2020
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Article Contents
Journal of Southwest Jiaotong University  > 2020  >  55(4): 719-725, 732.
WANG Jun, LIN Guojin, TANG Xie, XU Guowen, TANG Rui. Failure Characteristics and Engineering Application of Layered Rock with Two Pre-existing Non-coplanar Fissures[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 719-725, 732. doi: 10.3969/j.issn.0258-2724.20180044
Citation: WANG Jun, LIN Guojin, TANG Xie, XU Guowen, TANG Rui. Failure Characteristics and Engineering Application of Layered Rock with Two Pre-existing Non-coplanar Fissures[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 719-725, 732. doi: 10.3969/j.issn.0258-2724.20180044
shu

Failure Characteristics and Engineering Application of Layered Rock with Two Pre-existing Non-coplanar Fissures

doi: 10.3969/j.issn.0258-2724.20180044
  • Received Date: 16 Jan 2018
  • Rev Recd Date: 31 Aug 2018
    • Available Online: 10 Jan 2019
  • Publish Date: 01 Aug 2020
    Abstract
  • In order to study the failure mechanism of layered rock with pre-existing cracks, a numerical model which is based on particle discrete element method and can reflect the anisotropic characteristics of rock is built. The initiation and propagation of micro-cracks in anisotropic rock with two pre-existing non-coplanar fissures under uniaxial compression tests are analyzed. Furthermore, the failure process of surrounding rock after tunnel excavation is also obtained. Results shows that, the compressive strength of specimens with pre-existing fissures is smaller than that of intact rock, while the curve of relationship between strength and inclination angles is still ‘U’ shaped. The failure patterns are controlled by inclination angle of bedding plane (β) and inclination angle of fissures (α). For β < α, failure is controlled by fissures; for β > α, failure is controlled by both fissures and bedding planes or bedding planes. Failure patterns of surrounding rock is also related to β and α, while the damage zone is concentrated in certain regions around the tunnel in the direction normal to layers in all cases.

     

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