某矿山法地铁隧道施工地表沉降规律分析

Analysis of Surface Settlement Law of Subway Tunnel Construction by a Mine Method

文中选取某城市矿山法地铁隧道为研究对象,对地表沉降数据进行分析。结果表明,监测点地表沉降30%,超过控制值;地表沉降与隧道开挖、岩土体类型、围岩级别、掌子面开挖进度及是否及时施工初期支护和二衬有关。沉降历时曲线经历三个阶段,曲线呈现出两个拐点。加速沉降阶段需重点关注。隧道中心线中间区域内沉降较大,向两边沉降逐渐减小,隧道边缘线10m以外受影响较小。

The metro tunnel of a certain urban mining method was selected as the research object,and the surface settlement data was analyzed.The results showed that 30%of the monitoring points of surface subsidence exceeded the control value.Surface settlement is related to tunnel excavation,rock and soil type,surrounding rock level,face excavation progress,and whether the initial support and secondary lining of construction are in time.The sedimentation durationc urve goes through three stages,and the curve shows two infletcion points.The accelerated settlement phase requires special attention.The settlement in the middle area of the tunnel centerline is largea,nd the settlement to both sides is gradually reduced,and the impact is less 10 meters away from the tunnel edge line.