建筑物地下室底板下软弱土层中浅埋暗挖隧道施工技术

为实现深圳地铁1,3号线老街站通过2站间换乘体的平行换乘,对1号线既有运营老街站实施站台倒边改扩建。分析工程施工条件,就浅埋暗挖隧道施工关键技术及环境影响情况进行论述,用数值模拟分析桩基托换工作隧道的开挖及揭示桩基的施工过程对上部建筑物的影响,并对方案形成及实施过程中的重要环节予以总结讨论。所采用施工技术合理可行,有限元模拟分析最终规避了工程风险。

Construction Technology for Shallow-buried Mining Tunnel in Soft Soil Strata below Bottom Floor of Basement

In order to achieve parallel transfer between Metro line 1 and line 2 at Laojie Station of Shenzhen Metro,the platform of Laojie Station on Metro line 1 is expanded.The construction conditions are analyzed,the key tunneling technologies and the influence on the environment imposed by the tunneling under shallow overburden are discussed,the influence on the surface buildings imposed by the excavation of the tunnel and the exposing of the pile foundations are analyzed by means of numerical simulations.The engineering practice demonstrates that the technologies adopted are reliable and the construction risks are avoided with the help of the numerical simulations.