大型水电站调压井围岩力学参数反演及稳定性预测  

Inversion of Mechanical Parameters and Stability Prediction of Surrounding Rock of Surge Shafts in Large Hydropower Station

作　　者：冯晓成 张誉 FENG Xiaocheng;ZHANG Yu(Beifang Investigation,Design&Research Co.,Ltd.,Tianjin 300222,China)

机构地区：[1]中水北方勘测设计研究有限责任公司,天津300222

出　　处：《水力发电》2023年第7期30-33,113,共5页Water Power

摘　　要：大型水电站地下洞室群施工受复杂地质条件的影响,围岩稳定性问题突出。以某水电站调压井开挖为例,结合施工现场进度及新出露的地质信息,基于实测增量位移,通过均匀设计-神经网络开展围岩力学参数反演,获得围岩等效力学参数,并以此对后期开挖围岩力学响应进行预测分析。结果表明,调压井第4层开挖完成后,围岩变形及塑性区较大区域主要集中在1号调压井靠近断层F 230-2边墙处,后期施工应加强支护。Influenced by complex geological conditions,the stability problem of surrounding rocks in the construction of underground caverns in large hydropower station is prominent.Taking the excavation of surge shafts in a hydropower station as an example,combined with actual construction progress and new exposed geological information and based on measured incremental displacement,the uniform design-neural network is used to carry out the inversion and feedback analysis of mechanical parameters of surrounding rock,and the equivalent mechanical parameters are obtained.Based on these equivalent mechanical parameters,the mechanical response of the surrounding rock in the later stage of excavation is predicted.The inversion calculation results show that after the excavation completion of the fourth layer of the surge shafts,the larger areas of surrounding rock deformation and plastic area are mainly concentrated on the wall of No.1 surge shaft which is near fault F 230-2,and the support should be strengthened in later construction.

关 键 词：地下洞室 围岩稳定 参数反演 神经网络 调压井 大型水电站 

分 类 号：TU457[建筑科学—岩土工程]