【摘要】 低地应力是指在一定边界条件下最小应力值低于自重场应力最小值的现象。通过近几年的研究发现,我国西部特殊构造部位有低地应力存在。低地应力区软弱层带十分发育,岩体呈现明显的各向异性和强透水性,断层泥在软弱层带中的含量少,且多不连续,起不到很好的阻水作用;而次生张裂带最容易产生渗透变形和渗透破坏。在低地应力环境条件下岩体中软弱夹层对水利水电工程的建设和运营起控制作用,所以一定要采取相应的措施加以处理。更多还原

【Abstract】 Lower earth stress is a phenomenon that the minimum stress is no more than the minimum of self-weight stress under given conditions. Through research of recent years,it is found that there lies lower earth stress in special tectonic part in west China. Because of well developed weak intercalation in lower earth stress zone,rock mass displays strong permeability and obvious anisotropy,and fault gouge is so rare and non-continuous in rock mass that it hardly forms aquiclude. At the same time,secondary tension crack zones easily cause seepage deformation and failure. Under lower earth stress,weak intercalation within rock mass will control construction and operation of both irrigation works and hydropower station,so cautious emergency measures should be employed to deal with weak intercalation.更多还原