龙背湾低导流洞进口边坡变形稳定分析及加固处理

摘要

利用勘测的龙背湾水电站低导流洞进口边坡表层岩体参数,分析自然边坡的安全状态,修正边坡表层岩体的强度参数,并进行初始应力场计算.采用多节理本构模型,对边坡开挖时出现的卸荷裂缝处的岩体进行模拟,并分析裂缝的成因.对初步的加固措施进行模拟,分析开挖过程中,边坡的变形、稳定情况,并在此基础上,对原加固方案进行修改和补充,结合边坡的水位骤降工况,分析边坡的变形稳定情况.研究结果表明:加固措施具有可行性和有效性,为边坡的开挖、加固提供了理论依据.%Using the investigated rock parameters of Longbeiwan low diversion tunnel entrance slope,the status quo of the slope was analyzed.The rock strength parameters of the slope surface were modified and the initial stress field was calculated.Multi-joint model was used to simulate the unloading cracks during the excavation,and the causes were analyzed.The original reinforcement measures were simulated,and then,the deformation and stability situation during the excavation were analyzed.On the basis of these,reinforcement measures were modified and enhanced,and deformation and stability were analyzed when the slope is being suffered by a rapid drawdown of water level.The results show that the reinforcement measures are feasible and effective,which can provide theoretical support to the excavation and reinforcement of the slope.