裂隙化岩体中圆形断面调压井围岩稳定性分析

Stability Analysis of Surrounding Rock of Circular Surge Shaft in Fissured Rock Mass

块体理论是适用于裂隙化岩体变形失稳分析的有效方法。运用块体理论赤平投影法研究某水电站超大型调压井围岩随机块体的稳定性,将圆形断面调压井开挖临空面抽象简化为八个方位的边墙加以研究,分析了井周各部位可能的关键块体及其运动形式,计算了关键块体的净滑力。分析结果对工程施工具有可靠的现实指导作用,为锚固设计和永久衬砌设计提供了依据,可供类似工程参考。

Block theory is an effective and reliable engineering analysis method for the stability of fissured rock mass. Based on stereographic projection,an analysis is made for the stability of random blocks in surrounding rock of a certain circular surge shaft of a hydropower station. During the study with stereographic projection cylindric free surface is simply converted to eight walls. Potential key blocks and their moving modes are studied and the values of sliding force of those blocks are worked out. This could be a direction to the design of excavating,anchoring and permanent lining of those walls,and also a reference to similar projects.