从坝顶对岩溶坝基进行帷幕灌浆的关键和难点,在于如何灌好坝体与基岩的接触面、基岩表层强风化破碎带以及岩溶部位。河南省南阳水利建筑勘测设计院在帷幕灌浆施工中,经过不断摸索、总结,取得了一些成功的经验。 一、坝体与基岩接触面灌浆 坝体与凹凸不平的岩面直接相连,若帷幕顶部和地体接合不紧密,在高水位的作用下局部将会被水压穿透,造成集中渗流和接触冲刷,直接威胁大坝安 The key and difficult point of curtain grouting in the karst dam foundation from the crest lies in how to fill the contact surface between the dam body and the bedrock, the strong weathered and broken belt on the bedrock surface and the karst area. Henan Nanyang Water Conservancy Construction Survey and Design Institute in the curtain grouting construction, after continuous exploration, concluded, and achieved some successful experience. First, the dam and the bedrock contact surface grouting dam body and uneven rock surface directly connected, if the curtain and the top of the ground bonding is not close, under the action of high water level will be part of the hydraulic penetration, resulting in concentrated seepage and Contact erosion, a direct threat to dam safety