大型地下洞室围岩稳定性数值模拟分析

结合泰安抽水蓄能电站的工程建设实际,在现场地质调查和场区地勘资料分析的基础上,深入分析了工程区的地质力学环境条件,建立了能够反映研究区地貌、岩体结构和地应力环境条件的力学模型.以地应力实测结果为参照依据,采用线性有限元法反演分析了初始地应力场,采用非线性有限元方法模拟了地下厂房等主要洞室开挖施工与支护过程中的围岩应力和稳定性状况,全面论证了大型地下洞室开挖方案的可行性,揭示了大型地下洞室不同开挖阶段应力的集中部位和围岩的潜在破坏部位.

Numerical modeling analysis for surrounding rockmass stability of large underground cavities

The Tai'an pumped storage hydroplane project's geomechanics environment conditions of work areas were analyzed based on the local geology research and the geologic prospecting data analysis. Then a mechanical model was developed to express the actual conditions of the research area. The initial geostress field was inversely simulated by finite element method using the geostress data. The simulated data were applied for numerical analysis by nonlinear finite element method of the surrounding rockmass stresses and the stability of the main cavities, such as the underground workshop, during excavation.The results prove the feasibility of the big underground cavities excavation and reveal the stress concentration parts of the surrounding rockmass and the potential failure parts during the excavation of big underground cavities.