EFFECT OF WENCHUAN EARTHQUAKE ON EARTHQUAKE DAMAGE AND DYNAMIC RESPONSE ANALYSIS OF UNDERGROUND POWERHOUSE OF YINGXIUWAN
HYDROPOWER STATION
(1. State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan,Hubei 430072,China;2. Key Laboratory of Ministry of Education for Rock Mechanics in Hydraulic Structural Engineering,Wuhan University,Wuhan,Hubei 430072,China)
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.
谢和平,邓建辉,台佳佳,等. 汶川大地震灾害与灾区重建的岩土工程问题[J]. 岩石力学与工程学报,2008,27(9):1 781-1 791.(XIE Heping,DENG Jianhui,TAI Jiajia,et al. Wenchuan large earthquake and post-earthquake reconstruction-related geotechnical problems[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(9): 1 781-1 791.(in Chinese))
Your browse does not support frame!