下屯拱坝右坝肩 K6溶洞影响分析及处理方案研究

摘要

K6 karst cave is developed in 1140 ~1160m elevation of Xiatun arch dam right abutment.The cave is filled by clay and stones.The karst cave has larger scale,which is not beneficial for the stability of dam abutment.The karst cave has lower influence on the stability of dam abutment and downstream rocks according to analysis.The karst cave is excavated in order to improve the safety and reliability of the abutment.Concrete is backfilled,and concrete gravity pier is set.The above measures are introduced in the paper.%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。