中文摘要：

地震动作用下,高山峡谷地形将对邻近岸坡的岩体地下工程围岩地震响应特性产生影响,岸坡建筑物的动荷载也可能构成围岩稳定的不利影响因素。文章针对这个问题,首先分析了邻近岸坡地下工程围岩稳定的主要影响因素,并对岩体地下工程地震响应计算分析的一些关键问题进行了探讨。然后结合数值试验手段,对邻近岸坡地下工程围岩稳定的影响因素开展量化对比分析。最后以乌东德水电站地下洞室为例,根据其设防标准确定地震输入,对围岩稳定性进行了时程分析。计算时考虑了洞室施工开挖、高山峡谷地形和岸坡建筑物动荷载等影响地下工程地震响应特性的主要因素。研究结果表明,由于地下结构基本布置于岩性较好岩层,受到地震影响程度总体上较小,围岩稳定仍然主要由开挖支护工况控制;拱坝建基面动荷载对围岩稳定性也不构成控制性影响。

英文摘要：

Because of the motion during an earthquake, terrain such as high mountains and canyons may affect the seismic response characteristics of surrounding rocks around underground works adjacent to bank slopes, and structures on the bank slopes may also have adverse effects on the stability of the surrounding rock due to dynamic loads. On this basis, the main factors affecting surrounding rock stability are analyzed and the key problems regarding the calculation analysis of its seismic response are discussed and compared quantitatively by means of numerical simulation. Then, using the underground caverns of the Wudongde hydropower station as an example, a time-history analysis of the stability of the surrounding rocks is performed, with earthquake inputs determined by the fortification criterion. The factors of cavern excavation, high mountainous and canyon terrain and the dynamic loads of structures on bank slopes are considered in the calculation. The research results show that earthquakes have a little influence on the underground structures because of the sound rock lithology, the stability of the surrounding rock is mainly governed by cavern support, and the dynamic loads of the arch dam foundation base do not have a controlling influence on surrounding rock stability.