地铁车站洞桩法施工引起的邻近管线沉降规律研究

为了解地层变形引起的管线沉降规律,依托北京地铁10号线黄庄站工程,基于地表和管线沉降的实测数据,利用时程曲线分析车站洞桩法施工引起的邻近典型管线变形规律。洞桩法车站施工引起的管线沉降主要分为3个变化阶段：初期缓慢变化期,掌子面通过测点时的急剧变化期和掌子面通过后的稳定期。管道与土体在车站施工过程中产生一定的沉降差,在管道正下方土体开挖时差异沉降迅速增大,掌子面通过测点一定距离后,差异沉降趋于稳定。

Study on Pipeline Settlement induced by Construction of Metro Station by PBA Method

The regularity of the settlement of neighboring pipelines induced by the construction of Metro stations by PBA method is analyzed on basic of the monitoring data of the settlement of the ground surface and pipeline during the construction of Huangzhuang Station on line 10 of Beijing Metro.The settlement of the ground surface and pipelines induced by the construction of the Metro station by PBA method can be divided into 3 stages,i.e.,the initial slow-developing stage,the rapid-developing stage when the tunnel face is passing the monitoring points and the stable stage when the tunnel face has passed the monitoring points.The differential settlement between the pipelines and the ground increases rapidly when excavation is carried out below the pipelines and the differential settlement becomes stable after the tunnel face has passed the monitoring points.