洞桩法隧道导洞施工拱顶与地表沉降分析

Analysis on vault and ground subsidence in the benching tunnel construction with cavern-pile method

以某地铁站为基础建立了洞桩法隧道导洞施工的三维数值模型,探讨了导洞施工对导洞拱顶与地表沉降的影响,结果表明分期施工的导洞对拱顶与地表沉降存在相互影响,先开挖的比后开挖的最终沉降略大;现场实测沉降值通常比计算值大。

With a subway station as a base, it establishes three dimensional numerical model of benching tunnel construction with cavern-pile method. It has discussed the impacts of benching tunnel construction on drift vault and ground subsidence, and mutual impacts of stage con- struction drift on vault and ground subsidence. And then, it achieves that： final subsidence value of first-excavated comparing to last-excavat- ed, on-spot actual subsidence value is usually bigger than the predicted value.