矩形顶管上穿地铁隧道施工对地表变形影响研究

Study on the influence of construction of rectangular box jacking through metro tunnel on ground deformation

依托国内外研究现状,对矩形顶管施工引起地面变形原因进行了分析,提出地层损失是造成地面变形的主要原因。依托苏州人民路矩形顶管工程,将顶管机进入不同区域对轨道交通2号线的影响划分为5个重要阶段,以垂直顶管隧道轴线及垂直地铁隧道轴线方向为监测断面,分析现场实测数据发现关于顶管轴线处沉降规律、垂直顶管轴线监测沉降规律及地铁隧道上、下行线轴线处沉降规律,并提出在隧道上方地面堆加荷载、矩形顶管管节内部施加荷载及注入触变泥浆等控制地表变形的措施。

Relying on the current research situation at home and abroad,the causes of ground deformation caused by the construction of rectangular box jacking are analyzed,and the formation loss is the main cause of ground deformation.Relying on the rectangular box jacking project of Renmin Road in Suzhou,the impact of the box jacking machine entering different areas on the rail transit line 2 is divided into five important stages.The vertical box jacking tunnel axis and the vertical subway tunnel axis are taken as monitoring sections to analyze the actual measurement.The data found that about the settlement law at the box jacking axis,the monitoring settlement law at the vertical jacking box axis,and the settlement law at the uplink and downlink axis of the subway tunnel,measures to control surface deformation are propose,it was proposed to add loads on the ground above the tunnel,to apply loads inside the rectangular box jacking section and injecting thixotropic mud.