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    Volume 46, Issue 6 (April 2018)

    Microcrack Growth Behavior and CWFS Criterion Parameters Optimization of Granite with PFC

    (Received 31 August 2016; accepted 15 August 2017)

    Published Online: 16 April 2018

    CODEN: JTEVAB

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    Abstract

    Based on the physical and mechanical parameters obtained in laboratory tests, along with the section scanning of granite specimens, a microgeometric model of the granite particles was established in the Particle Flow Code (PFC) programs. The loading codes were programed and adjusted using the Fish language to simulate both uniaxial and triaxial compression tests. The micromechanical behavior and the evolution of cracks from the microcosm to the macrocosm of the granite were obtained under different loading conditions based on the complete stress-strain curves, Acoustic Emission (AE) monitoring results and crack number obtained from the tests, and PFC simulation. On this basis, the Cohesion Weakening and Friction Strengthening (CWFS) criterion model parameters of the granite were optimized and verified using the stress-strain curves, the relationship between the cracks, friction energy and plastic strain, and Fast Lagrangian Analysis of Continua simulation. The optimized CWFS criterion parameters of initial cohesion, residual cohesion, initial friction angle, and residual friction angle, as well as the critical plastic strain ϵcp and ϵfp of the granite, are 23 MPa, 4.3 MPa, 0°, 46.3°, 0.0015, and 0.0037, respectively. This provides a scientific basis for the establishment of a rock constitutive model during the transfer from open pit to underground mining in the Xingshan Iron Mine in China.

    Author Information:

    Miao, Shengjun
    Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology BeijingDepartment of Civil Engineering, University of Science and Technology Beijing, BeijingBeijing,

    Wang, Hui
    Department of Civil Engineering, University of Science and Technology Beijing, Beijing,

    Guo, Xuelian
    School of Earth Sciences, Key Laboratory of Western China’s Mineral Resources of Gansu Province, Lanzhou University, Lanzhou,

    Liang, Mingchun
    Department of Civil Engineering, University of Science and Technology Beijing, Beijing,

    Kong, Changqing
    Department of Civil Engineering, University of Science and Technology Beijing, Beijing,


    Stock #: JTE20160450

    ISSN:0090-3973

    DOI: 10.1520/JTE20160450

    Author
    Title Microcrack Growth Behavior and CWFS Criterion Parameters Optimization of Granite with PFC
    Symposium ,
    Committee D18