猴子岩水电站洞群硬脆性围岩变形破坏特征的3DEC分析

doi:10.13722/j.cnki.jrme.2014.0987

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Abstract During the excavation of the underground caverns at Houziyan hydropower station，high in-situ stress is encountered with the maximum principle stress being 36 MPa，and numerous small-scale geological discontinuities were also uncovered. As a results，the overall deformation of surrounding rock mass is comparatively large，and severe shotcrete failures，such as swelling and cracking，occurred. In order to investigate the deformation and failure mechanisms of rock mass and shotcrete，numerical simulations of caverns excavation using 3DEC code was conducted. In this numerical model a modified strain-softening constitutive model was used to simulate the unloading mechanical behaviors of brittle hard rock，and also the modeling of discontinuities having fictitious disk-like shape were specially considered. By analysis of development processes of both the stress concentration and the tensile strain in surrounding rock mass，this study suggests that the stress-dominated failures are easy to occur in the early stage of excavation due to high in-situ stress and relatively integrated surrounding rock mass，however with further excavation the discontinuities-dominated failures will progressively prevail over the stress-dominated ones because of increasing influence of discontinuities on stability of rock mass and the interaction among adjacent caverns. By analysis of displacement distribution and axial force developed in cables，this study suggests that for powerhouse cavern the significant difference between displacements on upstream sidewall and that on downstream sidewall is caused mainly by the opening and sliding of steep discontinuities which strike parallel to axial direction of powerhouse cavern.

Key words： rock mechanics high in-situ stress hard rock underground caverns strain-softening deformation characteristic failure mechanism

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	YANG Yunhao
	WANG Renkun
	XING Wanbo
	CHENG Lijuan

Cite this article:

YANG Yunhao,WANG Renkun,XING Wanbo, et al. ANALYSIS OF DEFORMATION AND FAILURE OF HARD ROCK MASS SURROUNDING UNDERGROUND OPENINGS IN HOUZIYAN HYDROPOWER STATION BY 3DEC NUMERICAL SIMULATION[J]. , 2015, 34(S2): 4178-4186.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0987 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/IS2/4178

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