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| MICROSCOPIC CHARACTERISTICS ANALYSIS OF BRITTLE
FAILURE OF DEEP BURIED MARBLE |
| LIU Ning，ZHANG Chunsheng，CHU Weijiang，WU Xumin |
| (HydroChina Huadong Engineering Corporation，Hangzhou，Zhejiang 310014，China) |
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Abstract The failure process of brittle material is closely related to the propagation of crack. The microscopic structure characteristics directly determine the macroscopic mechanical behavior. But currently limited by the test instrument，the brittle failure mechanism can't be fully understood，and the test method must be combined with numerical method. Firstly，the uniaxial and triaxial compression tests were finished by mechnical testing system(MTS)，and the acoustic emission(AE) signal was monitored. According to the test data，the failure characteristics of deep buried marble were analyzed in detail and the development evolution law of internal cracks and its influence on macroscopic mechanical properties were made clear. Particle flow code was introduced，and the particle and cement parameters were confirmed by completed uniaxial and triaxial compression tests. The brittle failure of rock was simulated by bonded-particle model(BPM). The numerical simulation results show that the PFC can accurately reproduce the crack propagation and failure characteristics of deep buried marble and show the valuable microscopic mechanism that can't be monitored and obtained in the actual test process. The PFC method can be relied on to describe failure characteristics and complex mechanical behavior of brittle rock.
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Received: 11 April 2012
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2012, Vol. 31 
