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| Mechanical property of B-type breccia under both natural and saturated state and its influence on the stability of underground powerhouse |
| LI Shuaijun1，FENG Xiating1，XU Dingping1，JIANG Quan1，ZHOU Yangyi1，XIAO Yunhua2 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. Three Gorges Geotechnical Consultants Co.，Ltd.，Wuhan，Hubei 430074，China) |
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Abstract The field investigation，laboratory experiment and numerical computation were carried out to systematically analyze the B-type breccia from a hydropower station. The laboratory test results indicated that the B-type breccia exhibits typical elasto-brittle-plastic feature under the confining pressures of 0–15 MPa. The specimen deformation tended to be uniform under relatively high confining pressure. Therefore，the elastic modulus had little relationship with the confining pressure. Due to the different calcite contents in the specimens，the peak strengths of the specimens differed markedly. Peak strength increased with the increasement of calcite contents. Compared with natural specimens，the internal friction angle of saturated specimens increased while cohesion decreases，which illustrated that water strengthened the bonding effect and weakened the internal friction coefficient；Three-dimensional numerical model including breccia mass was established. Mechanical response of B-type breccia under excavation was obtained through numerical computation. The numerical computation results fit well with monitoring data. It indicated that the surrounding rock was steady after systematic reinforced support have been set.
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2016, Vol. 35 
