回归应力场下的大型地下岔管围岩稳定及衬砌结构分析

Surrounding Rock Stability and Lining Structure Analysis for Large Underground Bifurcated Tunnel under Regression Stress Field

根据实测点反演研究区域的初始应力场是地下洞室围岩稳定性分析的首要工作。采用有限元模拟中常用的多元线性回归与逐步回归相结合的方法,结合某水电站地下尾水岔管段区域地形地质条件回归得到初始应力场,并在较准确的回归应力场下,研究该大型地下岔管在完建、运行和检修工况下衬砌厚度对围岩稳定及衬砌结构本身的影响,提出较合理的支护措施。

The measurement data-based inversion of initial stress field on research region is a primary work for underground chamber surrounding rock stability analysis. The multiple linear regression and stepwise regression which are common in finite element simulation are combined to obtain the initial stress field of a region after considering the topographical and geological conditions, where the underground tail water bifurcated tunnel section of a pump-storage power plant is arranged. Based on the initial stress field, the influences of lining thickness to surrounding rock stability and tunnel lining structure on the conditions of completion, operation and maintenance are studied respectively, and corresponding supports are also proposed.