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Volume 36 Issue 3
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PENG Jun, RONG Guan, ZHOU Chuang-bing, CAI Ming, PENG Kun. A strain-softening model based on GSI softening[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(3): 499-507. DOI: 10.11779/CJGE201403013
Citation: PENG Jun, RONG Guan, ZHOU Chuang-bing, CAI Ming, PENG Kun. A strain-softening model based on GSI softening[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(3): 499-507. DOI: 10.11779/CJGE201403013
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A strain-softening model based on GSI softening

  • 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering (Wuhan University), Ministry of Education, Wuhan 430072, China; 3. Bharti School of Engineering, Laurentian University, Sudbury, Ontario P3E2C6, Canada; 4. China Shipbuilding NDRI Engineering Co., Ltd., Shanghai 200063, China

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  • Received Date: May 22, 2013
  • Published Date: March 19, 2014
    Graphical Abstract
    • Abstract
  • The Mohr-Coulomb and Hoek-Brown failure criteria are the two most widely used ones at present. To simulate brittle failure of rocks in deep tunnels, the models based on these two failure criteria have been proposed, including the CWFS (cohesion weakening and friction strengthening) model, the DISL (damage initiation and spalling limit) model, and the BDP (brittle ductile plastic) model. These models have been used to simulate brittle failure of hard rocks. However, because of the issues of strain hardening under high confinement and large ambiguity in model parameter determination, it is very challenging to apply these models in practical engineering application. Based on the variation of the GSI (geological strength index) value during compression of rocks and by defining the GSI value as a function of plastic strain and confinement, a strain-dependent GSI-softening model, which is based on the Hoek-Brown failure criterion, is proposed in this study. This model is implemented in FLAC3D to simulate the triaxial compression tests on T2b marble in Jinping-II Hydropower Station and the Tennessee marble. It is found that the proposed model is able to simulate the mechanical behaviors of the brittle-ductile transition observed in the triaxial compression tests on Jinping and Tennessee marbles. Finally, this model is used to evaluate the relaxation depth of a headrace tunnel in Jinping-II Hydropower Station, and the calculated depths are in good agreement with the field observations.
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    • References (22)
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