阳江抽水蓄能电站地应力场回归分析

采用基于三维有限元正演分析、应力实测资料及将岩体自重和构造应力作为地应力的主要构成因素的多元线性回归方法,对阳江抽水蓄能电站的地应力场进行回归分析.通过拟合实测地应力资料获得对应于地应力构成因素的回归系数,进一步获得了整个工程区特别是重要工程部位的岩体应力分布.回归结果表明:工程部位岩体属中等应力水平,最大水平主应力方位随埋深的增加由EW方向至NWW方向偏转.文章最后揭示了工程局部应力场与区域应力场构造的关系.

Regression analysis of in-situ stress field for Yangjiang Pumped Storage Plant

Using a linear multivariable regression method based on 3-D FEM direct modeling,stress measurements and considering the in-situ stress field's main factors as the gravity and horizontal tectonic stress,the in-situ stress distribution is analyzed for Yangjiang Pumped Storage Plant in Guangdong Province;the regression coefficients corresponding to the in-situ stress factors are determined by fitting the stress measurement values;and the in-situ stress field is obtained for the rock mass of full engineering.The regression analysis results indicate that the stress value of the project site is at the medium stress level;and the direction of the maximum horizontal principal stress turns from EW to NWW along depth.Finally,based on the measured results,the relationship between this local stress field and the regional tectonic stress direction is also revealed.