块碎石架空地层深孔防渗墙施工塌孔预防措施

Prevention measures of hole collapse during construction of deep hole impervious walls in block gravel overhead stratum

塌孔是崩坡积体块碎石架空地层深孔防渗墙施工时遇到的主要难题。为解决民治水电站大坝基础混凝土防渗墙施工塌孔问题,现场利用力学知识分析不同类型塌孔产生的原因,采取减少槽段划分长度、加固基础软弱地层、选择适宜的方式处理漂石及其他针对性的预防措施,减少了塌孔次数,加快了施工进度,提高了施工效率,降低了安全风险,确保了工程的顺利实施。该施工经验对类似地质条件的地下防渗墙施工具有参考意义。

Hole collapse is the main problem encountered during construction of deep hole impervious walls in landslide slope mass block gravel overhead stratum.The mechanics knowledge is utilized in the site to analyze the causes of different types of hole collapse in order to solve hole collapse problem during construction of foundation concrete impervious wall in Minzhi Hydropower Station Dam.The preventive measures of reducing the slot section division length,reinforcing the foundation weak stratum,choosing appropriate mode to treat boulders and other pertinent prevention measures are adopted,thereby reducing the frequency of hole collapse,speeding up the construction progress,improving the construction efficiency,reducing the safety risk,and ensuring the smooth implementation of the project.The construction experience has reference significance to the construction of underground impervious walls under similar geological conditions.