汶川地震对映秀湾水电站地下厂房的震害影响及动力响应分析

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Abstract Yingxiuwan hydropower station is the nearest hydropower project to the epicenter of Wenchuan“5.12”earthquake. This hydropower station has been put into operation for several decades. It was severely affected by the earthquake，and its earthquake response intensity amounted to 11 degrees. Firstly，according to the in-situ investigation after the earthquake，the earthquake damage of underground powerhouse is analyzed. The following results are obtained：(1) The general stability of Yingxiuwan underground powerhouse is favorable. However，a certain local deformation is observed at the sidewall area of the main powerhouse，which lead to local failure in the main powerhouse causing crane to be unable to operate. (2) The paint on the bus bar opening sheds off and the surrounding rock in the traffic opening slightly cracks. Then，according to the data of Wenchuan earthquake monitored by Wolong strong motion station，which is the nearest station to the epicenter，the dynamic response analysis was conducted by FLAC3D. The calculation results show that the transverse deformation increments of the upstream and downstream sidewalls are 5.4 and 1.0 cm，respectively，in a short time；and the tensile stress at sidewall area exceeds surrounding rock¢s tensile strength，which causes tensile crack. Comparison of the monitoring data and calculating results show that the dynamic response analysis results agree with the regularity derived from the in-situ earthquake damage investigations. Therefore，the investigated earthquake damage can be explained through numerical analysis；and it provides references to the postseismic reinforcement and rebuilt work of hydropower projects as well as relative researches.

Key words： hydraulic engineering Wenchuan earthquake Yingxiuwan hydropower station underground powerhouse effect of earthquake damage dynamic response

Received: 01 July 2009

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	ZHANG Yuting1
	2
	XIAO Ming1
	2
	LI Yujie1
	2

Cite this article:

ZHANG Yuting1,2,XIAO Ming1, et al. EFFECT OF WENCHUAN EARTHQUAKE ON EARTHQUAKE DAMAGE AND DYNAMIC RESPONSE ANALYSIS OF UNDERGROUND POWERHOUSE OF YINGXIUWAN HYDROPOWER STATION[J]. , 2010, 29(S2): 3663-3671.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/3663

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