长沙地铁3号线盾构施工法引起的地表沉降及控制因素分析

Analysis and Control Factors of Surface Subsidence Caused by Shield Construction Method on Changsha Metro Line 3

本文主要研究长沙地铁3号线盾构施工法引起的地表沉降规律, 并探讨盾构施工法引发地表沉降的主要控制因素, 得出长沙地铁盾构法施工的地表沉降的典型特点.结果显示： 雅长区间的地表不均匀沉降主要发生在盾构区间的首段和尾段.因此, 长沙地铁盾构施工过程中应积极采取相应的工程措施, 优化设计方案, 防止水岩相互作用而导致的涌水涌沙, 合理设置土仓平衡压力, 配置渣土改良系统, 提高土仓中砂卵石土的流塑性和止水性.

This paper mainly studied the ground subsidence law caused by the shield construction method of Changsha Metro Line 3, and discussed the main control factors of the ground subsidence caused by the shield construction method, and drawed the typical characteristics of the ground settlement of the shield construction method in Changsha subway. The results showed that the uneven settlement of the surface mainly occured in the first and the end of the shield interval. Therefore, in the course of the construction of Changsha metro shield, the corresponding engineering measures should be taken actively to optimize the design scheme, prevent water and rock interaction caused by water gushing and sand flow, set the balance pressure of the soil bin reasonably, configure the residual soil improvement system, and improve the flow plasticity and water stop of the sand gravel soil in the soil bin.