某水电站地下厂房洞室群围岩稳定分析  

Stability analysis of surrounding rock of underground openings of a hydropower station

作　　者：余卫平[1] 耿克勤[1] 汪小刚[1] 

机构地区：[1]中国水利水电科学研究院岩土工程研究所,北京100044

出　　处：《岩土力学》2004年第12期1955-1960,共6页Rock and Soil Mechanics

摘　　要：采用有限元方法反演某水电站地下厂房厂区初始地应力场。采用 Zienkiewicz-Pande 的双曲线屈服准则,对某水电站地下厂房洞室群的开挖过程进行了三维弹塑性有限元模拟。为反映锚固支护对围岩的加固作用和评价地下厂房洞室群支护参数的合理性,提出了可以考虑抗剪作用的隐式锚杆单元和可以考虑预应力效果隐式锚索单元。计算结果表明,该洞室群在洞室布局、开挖顺序和支护参数等方面是合理的,各主要洞室群的稳定性总体较好。Finite element method (FEM) is adopted to back analyze initial geostress field around the underground power houses of a hydropower station. Three-dimensional elastoplastic finite element analysis is performed for the simulation of excavating of the underground power houses excavations by using hyperbola yield criterion of Zienkiewicz-Pande. In order to reflect the solidification effect on surrounding rock by anchorage and to evaluate rationality of underground openings' support parameters, a new element mode, which can take the shearing-resistant effect of bolt and the prestressing force of anchorage cable into account, is presented. The finite element calculation result shows that the openings' layout, construction sequence and support parameters are rational, main openings are stable well.

关 键 词：地应力反演 弹塑性有限元 围岩稳定 隐式锚杆锚索单元 

分 类 号：TU454[建筑科学—岩土工程]