地铁暗挖隧道下穿既有建筑物的影响规律研究
Study on the influence laws of subway underground tunnel passing through existing buildings
杨闯1
作者信息
- 1. 中铁十九局集团第六工程有限公司,江苏 无锡 214000
- 折叠
摘要
隧道施工无法避免下穿老旧房屋建筑物浅基础,如何有效地控制隧道开挖引起建筑物基础所处地层发生沉降一直是业内研究的重点.本文以无锡地铁区间隧道穿越既有建筑物为例,首先分析了全断面开挖法施工对既有建筑物基础的影响规律,然后对比分析采用CRD(Cross Diaphragm,交叉中隔墙法)和三台阶开挖方法对开挖面各部位围岩的影响规律.研究表明:采用全断面开挖方法下穿既有建筑物,既有建筑物基础各部位会发生不均匀沉降,靠近隧道掘进方向的建筑物基础监测点的沉降量较大;三台阶开挖方法相较于CRD开挖方法更有利于地铁隧道的稳定、安全.
Abstract
Tunnel construction inevitably involves passing through the shallow foundations of existing old buildings.How to effectively control the deformation and settlement of building foundation caused by tunnel excavation has been a focus of research.Taking Wuxi metro interval tunnel passing through the existing buildings as an example,this paper first analyzed the influence of full-section excavation on the foundations of existing buildings.Subsequently,the influences of Cross Diaphragm(CRD)and three-step excavation methods on the surrounding rock at different parts of the excavation surface were compared.The study showed that employing the full-section excavation method for tunneling through existing buildings results in uneven settlement of the foundations.The settlement is particularly significant at monitoring points close to the tunnel boring direction.In comparison,the three-step excavation method proved more conducive to the stability and safety of underground tunnels than the CRD excavation method.
关键词
既有建筑物/基础变形/三台阶开挖法/CRD开挖法Key words
existing building/foundation deformation/three-stage excavation method/CRD excavation method引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据