STABILITY ANALYSIS OF SURROUNDING ROCK AND RETAINING STRUCTURE DURING EXCAVATION OF TUNNEL GROUP AND OPERATION UNDER SEISMIC LOADING
Using the branch tunnel group of the power tunnel from a hydropower station as the object of study, with the method of static simulation of seismic loads, stress and deformation law of surrounding rock and the retaining structure are analysed with two-dimensional finite element analysis method considering the concrete lining and the anchor rod using separate model during digging and operation. The results show that the most adverse loading condition is a full water tunnel during an earthquake. Compared with the normal condition, the first principal stress value of the lining structure adds 0.3MPa～0.5MPa. For a circular cross-section, the largest tensile stress of lining occurs in the lining arch inside and in the interface between a fault and lining structure; the largest tensile stress of a anchor rod has a certain increase under seismic loading. For the profile through the fault, seismic loading can increase lining damage much more. Regarding to selecting the profile of the calculation, the surrounding supporting structures stability and security can be guaranteed; the results of the project provide a basis for the stability analysis of the surrounding rock and retaining structure.
XIAO-WEN LIU GONG ZHANG
School of Architectural Engineering, Nanchang University Jiangxi, 330031, P.R China
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
1457-1462
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）