锦屏一级水电站地下厂房下游拱腰喷层裂缝成因分析

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Abstract Monitoring results show that a lot of concrete shotcrete layer has fell and cracked around the underground powerhouse of Jinping I hydroelectric power station，and then many shotcrete layer are spalling with the crack development. Meanwhile，displacement of surrounding rock and bolt stress in the downstream hance of the powerhouse increases particularly. The cause analysis of deformation and failure of surrounding rock and the crack and spallig of concrete shotcrete layer around the downstream hance of the powerhouse is conducted by detailed field geologic survey and numerical calculation according to the force condition of underground powerhouse. The research results indicate that high level of stress concentration formed by high geostress and eccentric compression are the major factors which lead the concrete shotcrete layer at corresponding position to crack and spall；and the excavation of main transformer chamber and universal development of the fourth discontinuities aggravate the process.

Key words： hydraulic engineering Jinping I hydroelectric power station underground powerhouse cracking and falling of concrete shotcrete layer high geostress

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	Articles by authors
	LIU Jianyou1
	2
	WU Faquan1
	ZHAO Zhenhua3
	LI Shengqing3
	QI Shengwen1
	LIU Tong1
	DONG Jinyu1

Cite this article:

LIU Jianyou1,2,WU Faquan1, et al. CAUSE ANALYSIS OF CRACKS OF SHOTCRETE LAYER AROUND THE DOWNSTREAM HANCE IN UNDERGROUND POWERHOUSE OF JINPING I HYDROELECTRIC POWER STATION[J]. , 2010, 29(S2): 3777-3784.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/3777

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