摘要
依托实际工程的小半径曲线盾构隧道施工段,采用ABAQUS软件建立隧道-地层相互作用数值模型,采用“生死单元法”模拟隧道掘进过程,采用SGeMS程序得到参数随机场样本,重点研究曲率半径、土体参数变异性对地层变形的影响,得到了小半径曲线盾构隧道施工条件下周围土体的变形扰动规律和隧道衬砌结构的土压力分布规律。研究表明:小半径曲线盾构隧道施工所引起的地表横向沉降呈现不对称特征,内侧沉降较大,外侧轻微隆起;小半径曲线隧道开挖完成后,与静止土压力相比,衬砌顶部和两侧的土压力均大于静止土压力,底部土压力小于静止土压力;在隧道开挖过程中,考虑隧道所穿越土层的参数空间变异性对计算结果的影响不大,回弹指数的空间变异性对计算结果的影响相对显著。
This paper presents a tunnel-ground interaction numerical model based on a real project with a small-radius curved shield tunnel using the finite element code ABAQUS.The tunneling process is modelled using the kill-element method,and random fields of soil properties are obtained with the code SGeMS.This study is focused on the influences of the curvature radius and the spatial variability of soil properties on the deformation of surrounding soil and the distribution of earth pressures on the lining due to tunneling.The results show that:tunneling induced ground settlements exhibit asymmetric pattern with larger settlements on the interior side and slight heaving on the exterior side;the earth pressure is greater than the earth pressure at rest on the top and the lateral sides of the lining,while lower on the bottom of the lining;the spatial variability of the properties of the stratum burying the tunnel has little effect on the results.Nevertheless,the spatial variability of the rebound index has a relatively significant impact on the results.
作者
赵翌川
颜建平
张晨光
刘芳
ZHAO Yichuan;YAN Jianping;ZHANG Chenguang;LIU Fang(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092;Shanghai Urban Construction Design&Research Institute,Shanghai 200125)
出处
《现代隧道技术》
CSCD
北大核心
2022年第S01期243-250,共8页
Modern Tunnelling Technology
关键词
曲线隧道
地层变形
土体参数变异性
环境影响
Curved tunnels
Ground deformation
Spatial variability
Environmental impact
