乐昌峡水利枢纽5号坝段扬压力异常分析及处理方案探讨

Analysis and Treatment of Exception of Uplift Pressure of Dam Section 5 of Lechangxia Water Conservancy Project

为找出乐昌峡大坝5号坝段扬压力升高原因,在廊道5号坝段接触面、基岩采用自上而下分段钻孔、压水试验、扬压力孔的水文观测法,并结合地质资料进行试验、分析。结果显示:混凝土与基岩接触面在该部位基本连通,涌水主要来源于接触面。由此确定了压力过高的原因。同时,通过帷幕灌浆、清理排水孔等工序,能有效解决扬压力过高问题,从而满足工程安全运行的需要。

In order to analyze the cause of the uplift pressure of section 5 of Lechangxia dam,the top-down section drilling,water pressure test,hydrological observation of uplift pressure hole and geological data are used to analyze the contact surface and bedrock of corridor 5 dam section.The results show that the contact surface between concrete and bedrock is basically connected in this part,and the water gushing mainly comes from the contact surface,and the reason for the high pressure is determined.The curtain grouting and cleaning of drainage holes are used to effectively solve the problem of excessive lifting pressure and meet the requirements of safe operation of the project.