复杂地质条件下地下洞室曲面块体地震响应分析

近年来我国兴建了大批大型地下洞室群,许多地下工程因地震而遭到破坏,因此地震作用下地下洞室的动力响应及工程安全问题越来越受到重视.局部块体是控制洞室稳定的关键问题,对块体进行地震响应分析具有十分重要的意义.针对洞室区域存在大量复杂地质曲面的情况,在曲面块体的快速识别方法的基础上提出了曲面块体的地震响应分析理论与方法,研究了基于三维地质模型的随机裂隙面生成及动态校核技术,运用改进的Newmark法——Hilber-Hughes-Tayor算法对复杂地质条件下曲面块体的地震响应进行了分析研究,并将其应用于我国西南某水电工程实例中.

Surface-Block Identification and Seismic Response Analysis of Underground Structures Under Complicated Geological Conditions

In recent years, lots of large underground structures were built and many underground structures sufferedfrom earthquake. Therefore, the issues of the dynamic response of underground structures and engineering safetyhave attracted more and more attentions. Local block stability is a key issue in controlling the stability of undergroundstructures, and the study on the seismic response of block is of vital significance. According to the fact that there aremany complex geological surfaces around underground structures, the identification theorems and seismic responseanalysis theory of surface-block are presented in this paper. Random fissure surface generation based on 3D geologicalmodel and its dynamic check technology are also studied. A modified Newmark method Hilber-Hughes-Tayoralgorithm is used to analyze the seismic response of surface-block under complicated geological conditions. The wholetheory method is applied to a hydropower project in southwest China.