大柳树坝址岩体松动机制动力三维有限元分析

黄河黑山峡大柳树坝址区存在大范围的岩体松动现象。其主要特征是岩体应力释放。结构面张开。密度显著下降。为进一步研究岩体松动的成因机制，在详细调查区域地质背景条件及区域地震动力作用基础之上。提出了地震动力作用与岩体松动现象的内在联系，同时又通过动力三维有限元数值模拟计算。进一步证明大柳树坝址区存在的大范围岩体松动与历史上该地区发生的强烈地震具有密切关系。

Dynamic Three-dimensional Finite Element Analysis of Mechanism of Rock Mass Looseness at Daliushu Dam

There is a large-scale rock mass looseness in the area of Heishanxia DaLiushu dam of Yellow River. The main characteristics of rock mass looseness are geostatic stress release, opening of structural planes and density decrease. In order to study the mechanism of rock mass looseness, geological background conditions and earthquake dynamic effects of the region around the Daliushu dam are investigated. The internal relations between dynamic effects of eartjquake and rock mass looseness are presented. The dynamic three-dimensional finite element analysis gives a further evidence that the large-scale rock mass looseness in the area of DaLiushu dam is closely related to the strong earthquake in this area in history.