区间竖井水压平衡流砂处理方案研究

Study on Quicksand Treatment Scheme Under Water Pressure Balance in Interval Shaft

地铁区间竖井在施工过程中经常会遇到富水砂层,出现涌水涌砂。结合工程实例,研究处理竖井流砂的施工方法,介绍常用的减少动水压力法、坑内反压法,提出平衡动水压力法,即水压平衡下采用地面后退式注浆,对砂层进行加固处理的施工技术,为类似工程的施工提供借鉴。

In the construction process of the shaft in the subway section,the water-rich sand layer is often encountered,and the water-gushing sand appears sometiems.Combined with an engineering example,this paper studies the construction method of treating the flowing sand in the shaft,the method of reducing dynamic water pressure and the method of backpressure in the pit is introduced,and puts forward the method of balancing dynamic water pressure,that is,the construction technology of using the ground retrograde grouting to reinforce the sand layer under the balance of water pressure,which provides certain reference for the construction of similar projects.