复合地层新建隧道穿越既有地铁车站变形实测分析  

Deformation Measurement and Analysis of New Tunnel crossing Existing Metro Station in Composite Stratum

作　　者：杨磊 YANG Lei(Nanning Rail Transit Co.,Ltd.,Nanning 530029,China)

机构地区：[1]南宁轨道交通集团有限责任公司,南宁530029

出　　处：《价值工程》2020年第22期126-128,共3页Value Engineering

摘　　要：结合某地铁线下穿既有隧道监测项目,研究新建隧道接近既有建筑物的施工过程的监测方法,从而建立一套较完备、系统的监测方案。采用已建立的监测方案,系统分析新开挖隧道对既有建筑物周围土体的变形规律,监测数据显示:新建盾构隧道掘进施工对既有建筑物周围土体的影响范围有限,不会引起既有线路的整体偏移;断面节点沉降曲线表现出,既有线路的水平及竖向位移大幅增长均发生在盾构机完成下穿既有线路之后,其中有断面的隆起超出控制值,这是后期监测应重视的关键点。Combined with the monitoring project of Line 10 crossing the existing line 4,the monitoring method of the construction process of the newly excavated tunnel approaching the existing line was studied,so as to establish a complete and systematic monitoring scheme.The established monitoring scheme is adopted to systematically analyze the deformation law of newly excavated tunnel on the soil around the existing buildings.The monitoring data shows that the influence range of newly excavated shield tunnel tunneling construction on the soil around the existing buildings is limited and will not cause the overall migration of existing lines.The settlement curve of the section node shows that the significant increase of horizontal and vertical displacement of the existing line occurs after the shield machine completes the undercrossing of the existing line,in which the uplift of the section exceeds the control value,which is the key point that should be paid attention to in the later monitoring.

关 键 词：新建隧道 既有建筑物 监测方法 变形 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]