天然和饱水状态B类角砾岩的力学性质及其对地下厂房稳定性的影响

doi:10.13722/j.cnki.jrme.2015.1314

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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.

Key words： rock mechanics B-type breccia natural and saturated state softening effect underground powerhouse stability of surrounding rock

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	Articles by authors
	LI Shuaijun1
	FENG Xiating1
	XU Dingping1
	JIANG Quan1
	ZHOU Yangyi1
	XIAO Yunhua2

Cite this article:

LI Shuaijun1,FENG Xiating1,XU Dingping1, et al. Mechanical property of B-type breccia under both natural and saturated state and its influence on the stability of underground powerhouse[J]. , 2016, 35(8): 1530-1542.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.1314 OR http://www.rockmech.org/EN/Y2016/V35/I8/1530

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