宜兴抽水蓄能电站试验洞的反分析研究

结合江苏宜兴抽水蓄能电站地下厂房试验洞量测资料的分析,研究了成层各向异性岩体中洞室工程问题的反分析方法。采用分层均质模型进行反分析计算。计算区域的各层岩层均被分别视为均质各向同性体,初始地应力假设呈线性分布。有限元分析中,对倾斜成层的岩层、软弱夹层及断层节理等分别划分了单元,据以模拟成层岩体的各向异性特征。为使计算过程简化,对离洞室较远的岩层拟按地质资料对材料特性参数赋值,反分析计算的目标未知数为初始地应力和试验洞相邻围岩的弹性模量。结果表明,与工程实践符合较好。

Back-analysis of experimental opening in Yixing pumped storage power station

Based on the measurement data of Yixing hydroelectric station's experimental cavity in Jiangshu province, the paper researched the back analysis method of layered anisotropic cavity engineering. It assumed the initial rock stresses to be in linear distribution, regarded all layers of strata as layered homogeneous in calculation districts, and applied this model to doing calculation. As to the slant and layered stratum, flaccidity interlayer and fault texture, it separately plotted them out element to simulate the anisotropic character of layered rock mass in finite element (FEM) analysis. According to the geological data, it evaluated rock medium characteristic parameters on these strata away from the cavity to simplify the calculation. The unknown targets are the value of initial rock stresses and the material elastic module parameter of the surrounding rock in back analysis. All these results are practical and have been put into use in engineering practices.