摘要
研究目的:随着城市轨道交通的快速发展,中心城区的深基坑工程经常紧邻正在运营的地铁区间隧道,深基坑开挖需确保邻近地铁区间隧道严格的变形保护要求,基坑工程设计由强度控制转变为变形控制。结合上海典型软土地层中紧邻地铁区间隧道深基坑工程的设计和成功实践,总结相关设计方法和措施,给类似深基坑工程设计提供参考。研究结论:针对基坑开挖对邻近地铁盾构区间隧道附加变形<20 mm的严格保护要求,在紧邻上海地铁2号线区间隧道的南京西路1 788地块基坑工程中,采用中间设置临时隔断地下连续墙将基坑一分为二、"分区顺作"的设计方法,并采取了数值模拟分析和专项保护措施,在工程实施过程中对基坑工程和区间隧道进行了详尽的基坑监测。监测结果表明,基坑本身安全、对邻近地铁区间隧道的影响都在安全可控的范围内。
Research purposes： With the rapid development of the urban subway traffic in Shanghai China, the deep excavations are usually adjacent to the running subway tunnels. The strict deformation demands must be need by the excavation engineering. The designing of excavation adjacent to subway tunnel are controlled by deformation not by strength. So the research on the design method and measurements of the deep excavation, which on the basis of successful design and construction of deep excavation engineering adjacent to the subway tunnel in the typical soft soil of Shanghai, is necessary and significant. Research conclusions：For the protection of adjacent subway tunnel which the accessional settlement of the tunnel induced by the excavation can not exceed 20mm. Considering the protection of adjacent Shanghai No. 2 tunnels of NO. 1788 of west Nanjing road, many special measurements were applied to the designing of pit project. Including the proposal of down - up method with zoned construction with a temporary diaphragm wall inside the excavation engineering, prediction the accessional deformation of tunnels by numerical analysis and detailed in situ monitoring of the pit and tunnels during excavation. According to the in situ monitoring data, The protection of the adjacent tunnels is successful and it testified the validity of the designing and construction of the excavation engineering in soft soil.
出处
《铁道工程学报》
EI
北大核心
2011年第11期104-111,共8页
Journal of Railway Engineering Society
关键词
软土地区
地铁区间隧道
深基坑工程
变形控制
分区顺作
subway tunnel
soft soil
deep excavation
deformation control
down -up method with zoned construction
