摘要
为解决富水圆砾地层土压平衡盾构在曲线接收段近距离下穿既有车站施工风险控制难题,以南宁轨道交通5号线下穿既有1号线广西大学站工程为背景,采用现状调查、数值模拟、现场实测等方法,分析盾构隧道近距离下穿既有车站结构的施工风险,采用MIDAS GTS NX有限元软件建立三维数值计算模型,预测穿越施工对既有车站、出入口的受力及变形影响,提出自动化监测和人工监测相结合的监测预警控制值,并通过素桩加固、地层加固、削磨桩墙、开舱换刀、群井降水等相关技术方案和措施,动态调整盾构施工参数,最终实现了一次性成功穿越,保障了既有线的安全运营。
To control the risk of an earth pressure balance shield obliquely tunneling underneath an adjacent existing metro station in a curved receiving section and a water-rich gravel stratum,a case study is conducted on the Nanning rail transit line 5 crossing beneath the Guangxi University station of the existing line 1,and the construction risks of the existing station structure are analyzed using the methods of current situation investigation,numerical simulation,and field measurement.Subsequently,a finite element software MIDAS GTS NX is used to establish a three-dimensional numerical model to predict the influence of stress and deformation on the existing station and entrance.The early warning control value is proposed combining automatic and manual monitoring,and the shield construction parameters are dynamically adjusted through relevant technical schemes and measures,such as plain pile reinforcement,stratum reinforcement,pile wall cutting,chamber opening and cutter changing,and well group dewatering.Finally,successful shield crossing underneath the existing station is achieved,thereby ensuring the safe operation of the existing line.
作者
孙会良
胡盛斌
肖鹏飞
胡敏
SUN Huiliang;HU Shengbin;XIAO Pengfei;HU Min(Nanning Rail Transit Co.,Ltd.,Nanning 530029,Guangxi,China;School of Civil Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan,China)
出处
《隧道建设（中英文）》
CSCD
北大核心
2021年第7期1206-1217,共12页
Tunnel Construction
基金
国家自然科学基金资助项目(51908065)。
关键词
盾构隧道
斜交穿越
既有车站
数值模拟
结构变形
监测
shield tunnel
obliquely crossing
existing station
numerical simulation
structural deformation
monitoring
