某电站地下厂房区域初始地应力反演分析

Back analysis of 3D in-site stress field of an underground powerhouse region

根据某电站地下厂房区域工程地质条件以及实测地应力资料,分析影响区域初始地应力的因素,建立电站厂房区域三维有限元模型,利用FLAC^(3D)数值计算软件对工程区域初始地应力场进行三维有限元模拟,在实测地应力值与计算地应力值之间建立多元回归模型,求出各回归系数,结果表明模拟得到的初始地应力场与实测地应力值相符,能够满足工程设计、施工的需要.

Based on the measured data of initial geostress and engineering conditions in the region of an undeground powerhouse,the factors afecting the initial geostress are discussed. Estabilish the three dimensional finie madol, then FLAC3Dare used to make back-analysis on in-situ stress field of the underground powerhouse region. A multivariate regression model is developed for measured and calculated results of geostress at measurement points,and the regression coefficient of the model is derived. The result shows that the calculated stress is reliable and it provides a gist for designing and constructing the underground powerhouse.