某地铁盾构区间风井基坑支护设计及施工监测分析

The Underground Shield metro Tunnel Air Shaft Excavation and Analyses of Monitoring Situation

地铁盾构区间风井基坑是一个尺寸小而坑深大的深基坑工程,其具有显著的三维空间效应。目前基坑设计方法主要是弹性地基反力法,它是一种平面问题分析方法,不能考虑围护结构的空间效应。本文通过对杭州地铁某盾构区间风井富水砂质粉土地层深基坑工程设计,采用弹性地基反力法分析,考虑基坑空间效应的作用进行围护结构优化设计,并分析了基坑施工过程中的施工监测情况,在保证基坑安全、周边构筑物安全的条件下降低了基坑围护工程的造价,验证了基坑优化的合理性,可供此类基坑设计参考。

The underground shield metro tunnel air shaft excavation is a deep excavation project which has small size length and width.It has remarkable threeD spatial effect.Now the designing method we use most is the method of reaction force on elastic foundion.For it＇s a analyzing method of two dimensions,it has considerable limitation when used in deep excavation design having obvious spatial effect.This paper analyzes a deep excavation project,which has more water-rich sandy silt ground in one shield metro tunnel of hangzhou underground,through the method of reaction force on elastic foundation.This analyses optimizes building enclousure for the excavation spatial effect,and analyzes the monitoring situation in the process of excavation construction,It reduces the cost of excavation support and ensures the safty of excavation and surrounding construction,Confirmed the rationality optimization of the design.This paper has important referential value for this type excavation designing.