巨漂孤石、倒悬体及陡坎地层中防渗墙施工关键技术探讨及应用

Discussion and Application of Key Construction Technology of Impermeable Wall in Boulder Floating, Overhanging Body and Steep Stratum

防渗墙施工与地质环境的相关理论、复杂地层的钻进工艺,在孤石巨漂密集地层、倒悬体及陡坎处理措施工艺等的研究仍显不足,在很大程度上制约了防渗墙施工技术的发展。针对存在特大巨漂孤石、超厚倒悬体、深切河床及超高陡坎地层的防渗墙施工,本文依托双江口水电站特殊地质条件,对该地层防渗墙施工关键技术进行研究和创新,总结出一套针对这种特殊地层先进的施工工艺及处理方法。

The research are still insufficient on related theories of the impermeable wall construction and the geological environment,the drilling technology of the complex stratum,the treatment technology of the boulder floating dense stratum,the overhanging body and the steep stratum,which restricts the development of the construction technology of the impermeable wall to a great extent.Aiming at the construction of impermeable wall in the stratum with super large boulder,super thick overhanging body,deep riverbed and super high and steep stratum,and basing on the special geological conditions of Shuangjiangkou Hydropower Station,this paper studies and innovates the key construction technology of the impermeable wall in such stratum,and summarizes a set of advanced construction technology and treatment methods for this special stratum.