摘要
以深圳地铁12号线区间隧道为例,利用数值模拟对双线盾构穿越全风化变粒岩地层的力学参数与土仓压力调整控制参数敏感性进行研究,并与现场监测数据进行对比。研究结果表明:盾构施工过程中需采取必要的土体改良措施提高地层的整体性,地层的弹性模量为150~180 MPa,土仓压力取值0.2~0.4 MPa;左右线隧道净空收敛变形监测结果与数值模拟结果的变化趋势基本一致,这表明该工程典型区间施工方案对隧道收敛变形的控制较好,有利于工程的正常进行。
Taking the tunnels in the Shenzhen metro line 12 sections as an example,the sensitivity of the mechanical parameters and the pressure adjustment control parameters of the double-tube shield through the fully weathered granulite stratum is researched through numerical simulation,and compared with the field monitoring data.The research results show that the necessary soil improvement measures shall be adopted during the shield construction process,to improve the stratigraphic integrity,and the elastic modulus of the stratum is 150~180 MPa.The value of the earth silo pressure is 0.2~0.4 MPa.The monitoring results of the tunnel clearance convergence deformation on the left and right lines are basically consistent with the variation trends of the numerical simulation results,which shows that the typical section construction program for the project has a good control on the tunnel convergence deformation,being conducive to the normal operation of the project.
作者
佘国生
段景川
She Guosheng;Duan Jingchuan
出处
《现代城市轨道交通》
2021年第S01期81-85,共5页
Modern Urban Transit
关键词
地铁
长距离
双线盾构
硬岩
弹性模量
土仓压力
metro
long distance
double-tube shield
hard rock
elastic modulus
earth silo pressure
