复杂地质条件减少地连墙停机时间施工技术

Construction Technology of Reducing Down Time of Diaphragm Wall under Complex Geological Conditions

以西气东输三线某盾构项目始发竖井地连墙施工为例,该竖井施工依次穿越粉砂、漂石、中风化炭质页岩等复杂地层,其中粉砂层和卵石层属于强透水不稳定地层;中风化炭质页岩硬度较大,给竖井施工带来了极大难题。本文提出了改进清槽工艺、优化施工参数等针对性解决方案,为盾构工程乃至西气东输三线西段按期完成提供了有力保障。

Taking the construction of originating shaft of a shield tunnel project of the third west-east gas pipeline as an example, the shaft passes through the complex stratum such as silty sand, boulder, moderately weathered carbonaceous shale, etc. In those geospheres, silty sand and boulder layer are highly permeable and unstable, and moderately weathered carbonaceous shale has a great hardness, which brings great difficulty to construction. This paper puts forward optimizing technology of cleaning tank bottom and construction parameters to solve these difficulties, providing a strong guarantee for the completion of the west section of the third west-east gas pipeline on schedule.