【摘要】 皎平渡山洞遗址在金沙江乌东德水电站蓄水后将淹没于水下约90 m,由于水库蓄水及调蓄对地质环境的改变常诱发地质灾害，因此需对其进行保护加固。以皎平渡山洞遗址及其赋存岸坡为研究对象，综合考虑岸坡整体稳定性、山洞遗址局部稳定性以及长周期、高水压下的耐久性，提出了“抗滑桩、桩板墙、坡体注浆、坡表防渗、土方回填注浆、防渗帷幕、坡表锚喷及山洞回填”的综合治理方案。在此基础上，采用有限元法对治理前后库水位升降各阶段的瞬态渗流场进行了分析。结果表明：治理区的浸润线位置变化进程由单向快速抬升转变为双向“包围式”缓慢抬升；山洞遗址区土体饱和时间由18 d延长至148 d,其孔隙水压力变化速率在水位上升阶段由（10～35） kPa·d^-1降低至1.64 kPa·d^-1,水位下降阶段则由10 kPa·d^-1降低至（0.1～0.51） kPa·d^-1。说明该方案可有效减缓治理区地下水位的抬升和土体的饱和进程，并显著降低孔隙水压力的变化速率。更多还原

【Abstract】 The impoundment and storage of Wudongde Hydropower Station reservoir of Jinsha River will change the geological environment and induce geological disasters inevitably.The most realistic thing is that the impoundment will submerge the Jiaopingdu cave ruins about 90 m underwater, so it is necessary to protect and reinforce the ruins.On the basis of comprehensive analysis of the overall stability of the bank slope, the local stability of the cave ruins and the durability under long period and high water pressure, a comprehensive treatment scheme of “anti-slide pile, pile slab wall, slope grouting, slope surface seepage prevention, earth backfill grouting, anti-seepage curtain, slope surface anchoring and cave backfill” is proposed.Accordingly, the finite element method is used to analyze the transient seepage field of the reservoir water level before and after treatment.The results show that the variation of the position of the wetting line in the control area changes from unidirectional rapid lifting to bidirectional “encircling” slow lifting.The saturation time of soil in the cave site is extended from 18d to 148d, and the change rate of pore water pressure decrease from（10～35） kPa·d^-1 to 1.64 kPa·d^-1 at the stage of water level rise, and from 10 kPa·d^-1 to（0.1～0.51） kPa·d^-1 at the stage of water level fall.It shows that this scheme can effectively slow down the rise of groundwater level and the saturation process of soil, and significantly reduce the change rate of pore water pressure.更多还原