大型地下洞室群参数反演及其工程应用

基于三维弹塑性有限元及遗传算法,结合西龙池抽水蓄能电站工程实际,首先用小模型分段模拟工程中有明显差异的几个不同段位,并反演得到围岩物理力学参数及支护前围岩位移释放系数。在此基础上,对洞室进行了二期开挖计算,成功预测了二期开挖后洞室变位、围岩稳定、锚杆锚索应力等状况,揭示了洞室应力集中和围岩的潜在破坏部位,对工程施工具有重要指导意义。

Parameter Inversion of Large Underground Cavities and Engineering Application

Combined with the Xi'longci pumped storage hydroplane project, the several segments having obvious difference in engineering,are simulated by small models based on the three-dimensional FEM and genetic algorithm. The back-analysis parmeters are obtained and input the whole FEM model to compute the displacement around caverns,stress of anchor bar,etc. Matched with observing date, in view of the preceding work, the No.2 excavation is calculated. It calculates successfully the displacement of around caverns , the stability of sum wnding rock, the stress of anchor bar and cable, etc, reveals the stress concentration and potential failure parts of the surrounding rock. It has important directive function.