偏压条件下大型地下厂房围岩变形稳定性分析

根据下坂地水库协力波斯电站工程建设实际,在现场调查和电站区勘探、测试资料基础上深入分析地下厂房地质条件,建立了能够反映厂区地形地貌、岩体结构和地应力状态的三维数值模型。根据地应力实测资料反演拟合初始地应力场背景值,采用三维弹塑性有限差分法模拟了在偏压条件下地下厂房、主变室开挖过程中围岩变形和稳定性状况,揭示了各开挖阶段应力的集中部位和围岩潜在破坏部位,这对于工程具有重要的指导意义。

THREE DIMENSIONAL ELASTO-PLASTIC NUMERICAL ANALYSIS OF STABILITY OF SURROUNDING ROCK AT AN UNDERGROUND PLANT UNDER AN ASYMMETRICAL LOAD

Based on the field investigation and experimental data,the authors analyzed geological conditions at an underground plant.Numerical models were developed to well represent the topography,rock mass structure and in-situ stress state.The initial stress condition was estimated using inverse analysis of stress data from in-situ test.With the 3-dimensional elasto-plastic finite difference method,rock mass deformation and stability state of the underground plant were simulated under an asymmetric load.Potential failure and stress concentration were assessed for different excavation stages,which would provide guidelines for a successful completion of the project.