不同地震动输入方向下的大型地下岩体洞室群地震反应分析  

SEISMIC RESPONSE OF A LARGE UNDERGROUND ROCK CAVERN GROUPS CONSIDERING DIFFERENT INCIDENT ANGLES OF EARTHQUAKE WAVES

作　　者：赵宝友[1,2] 马震岳[2] 丁秀丽[3] 

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]大连理工大学土木水利学院,辽宁大连116024 [3]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《岩石力学与工程学报》2010年第A01期3395-3402,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50679009)

摘　　要：以某水电站为工程背景,建立该水电站地下厂房大型岩体洞室群有限元-无限元耦合动力计算模型。在洞室群开挖稳定后所形成的二次应力场和地震动荷载联合作用下,进行不同地震动输入方向下的大型岩体洞室群地震反应研究。研究结果表明,地震动斜入射对地下岩体洞室群的动力反应和稳定性有不利的影响,在进行类似的大型地下岩体洞室群地震动安全评价时应考虑地震动输入方向的影响。The finite-infinite element coupling model of a large underground rock cavern groups is set up which is located in the western of China. Firstly, in order to obtain the reasonable secondary geostress field, the rock cavern is excavated under the loading of gravity. Then its seismic response is studied under the combined loadings of the secondary geostress formed after excavation and the seismic motion considering different incident angles. Simulated results indicate that the obliquely incident earthquake waves dramatically influence the seismic response of underground rock cavern groups, for example, the distribution of stress and the plastic zone of the cavern groups The incident angle of seismic wave should be taken into account in the seismic safety assessment of the similar underground rock cavern groups.

关 键 词：岩石力学 岩体洞室群 地震动输入方向 地震反应 

分 类 号：TU45[建筑科学—岩土工程]