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洞桩法能够较好地控制地层变形和对周边既有建(构)筑物的影响,目前已成为北京地铁暗挖车站施工的主流工法。以北京地铁10号线黄庄站工程为背景,基于地表和管线沉降的实测数据,建立“隧道-管道-土体”的三维有限元计算模型,研究了洞桩法车站施工对地层的影响,并从沉降、变形和管-土相互作用等方面系统研究了施工对邻近刚性接头管道的影响。研究结果表明,洞桩法车站施工中导洞和扣拱施工是关键工序,这两个工序引起的地表沉降占总沉降的90%以上;刚性接头管道的沉降、变形及管道-土体差异沉降与管道和隧道相对位置关系密切相关,主要受其正下方土体开挖影响;管道变形由整个管体共同承担,地层位移使管道产生弯曲和轴向变形,建议采用应变作为管道变形控制标准。
The hole pile method can well control the deformation of the stratum and the influence on the existing structures (structures) in the surrounding area. It has become the mainstream method for the construction of the underground excavation station in Beijing. Taking the Huangzhuang Subway Line 10 project of Beijing Metro as a background, based on the measured data of surface and pipeline settlement, a three-dimensional finite element model of “tunnel-pipe-soil” The influence of construction on the pipelines adjacent to the rigid joints was systematically studied from the aspects of settlement, deformation and pipe-soil interaction. The results show that the construction of the guide tunnel and the buckle arch are the key processes during the construction of the station-pile method. The settlement caused by the two processes accounts for more than 90% of the total settlement. The settlement and deformation of the rigid joint pipe and the differential settlement of the pipe-soil It is closely related to the relative position of pipeline and tunnel, which is mainly affected by soil excavation just below it. Pipe deformation is shared by the entire pipe body. Strata displacement results in bending and axial deformation of pipelines. It is recommended that strain be used as a control criterion for pipeline deformation.