围护结构无法封闭时基坑工程处理措施

Engineering Treatment Method for Foundation Excavation Engineering in Unclosed Enclosure Structure

在基坑工程的设计过程中,经常会遇到因障碍物的存在致使围护结构无法封闭的工程情况,在此情形下,基坑工程的成功与否往往取决于对障碍物处围护结构的处理措施。目前,工程领域对此问题的常规处理方式是避开障碍物,对于无躲避空间的情况尚无研究。本文以南京地铁某车站深基坑为例,在基坑工程因110k V电力箱涵无法封闭时,采取了桩间挡板法并辅助以基坑外侧旋喷桩土体加固措施,取得了良好的效果。在地层含水量不大的地质条件下,本方法具备一定的推广价值。

When designing for excavation engineering,sometimes the enclosure structure can not be closed for the existing obstacles. So the solution for enclosure structure against obstacles is the very key point for foundation excavation engineering. It is the common approach to avoid the barriers in engineering fields at present. There is also no further research in case of no more escape space.Therefore,this paper takes foundation excavation of a subway station in Nanjing as an example. The foundation excavation could not be closed up because of the existing 110 k V electric box and no transferred room. A slab-between-piles method was taken,with jet grouting reinforcement of the soils outside the excavation,have got a satisfying effect. Based on geologic condition of low moisture,this solution is worthy of popularization.