中文摘要：

为了有效地防止建于坚硬岩体中的水电站地下厂房围岩中的块体崩塌现象,在对荒沟水电站地下厂房系统地质条件详细勘察的基础上,运用适用于分析不连续面发育的破碎岩体的块体理论,依据探硐揭露的不连续面的产状,测点坐标等工程数据,采用矢量分析法编制了洞室稳定性矢量分析程序VATS（Vector Analysis for Tunnel Stability）,实现了对地下厂房系统洞室群围岩中关键块体的确定性搜索,获取了生成关键块体的不连续面的可能组合、确切位置及其稳定性参数,并以AUTOCAD程序为可视化平台,图形展示不同部位中关键块体的几何分布特征,从而为开挖及加固方案的设计提供依据。

英文摘要：

The underground powerhouse of hydroelectric station are built on the stiff rock mass to prevent the falling of blocks in surrounding rock mass. Based on particular geologic reconnaissance to the underground powerhouse of Huanggou hydroelectric station, according to the attitude of disclosed discontinuous face in detecting cavern and coordinates of measuring points, the vector analysis program for tunnel stability is compiled by use of the method of vector analysis of the block theory which is applicable to analyse the discontinuous rock mass and numerical software Matlab. The determinate research of key blocks of surrounding rock mass for underground powerhouse is implemented, the combination of discontinuous faces, the determinate location and the parameters of stability of key blocks are obtained. Finally, the geometry distributing characteristics of key blocks at different positions are figured , the guidance for excavation and reinforcement of underground caverns is provided.