下屯水电站右坝肩在1140~1160m高程发育K6溶洞,洞内黏土夹块石充填,溶洞规模较大,对拱坝坝肩的稳定不利。经分析溶洞对拱坝坝肩及下游岩体稳定的影响较小,但为了提高坝肩的安全可靠性,对溶洞进行了清挖,并回填混凝土及设置了混凝土重力墩。本文对此加以介绍。 The right abutment of Hydropower Station of Xitun Hydropower Station develops K6 karst caves at 1140 ~ 1160m elevation. The clay in the cave is filled with clays, and the karst cave is large in size, which is unfavorable to the stability of the arch dam abutments. The analyzed caverns have little influence on the stability of arch dam abutments and downstream rock mass. However, in order to improve the safety and reliability of the abutments, the caverns are excavated and the concrete backfilled and the concrete gravity piers are set up. This article describes it.