摘要
TBM在开挖隧道过程中不可避免地会引起地层初始应力场的改变,导致开挖面围岩的扰动与变形。依托青岛地铁1号线地铁隧道下穿市北区人民路立交桥工程,采用弹塑性数值计算分析方法,建立TBM隧道斜交下穿城市立交桥三维力学计算模型,开展城市地铁隧道下穿既有市政桥梁施工过程模拟,研究TBM隧道斜交下穿城市立交桥施工过程中隧道拱顶和既有桥梁桩基的沉降规律,揭示TBM隧道掘进引起周围岩体的损伤破坏发生、发展过程;通过对比分析隧道及围岩的应力变化、塑性区破坏模式以及位移矢量等信息,预判隧道围岩破碎带的发展趋势,为工程建设提供重要参考依据。
During the tunnel excavation using Tunnel Boring Machine(TBM),the initial geo-stress field will be changed.This change of geo-stress results in the rock mass disturbance and deforming at the face of excavation and then induces the ground subsidence.This paper presents the a three-dimensional elasto-plastic numerical simulation of the TBM excavated tunnel for No.1 Line of Qingdao Metro that skewed undercrossing the urban viaduct at Renmin Road of Shibei District.The process of tunnel excavation on the urban municipal bridge above is simulated with the focus on the deformations at top of tunnel and the pile supported foundation of the viaduct structure.Further,the breakage and deformation surrounding rock mass at the TBM excavation face was also simulated and the rock stress changes as well as the development of plastic zone were also compared so that the broken zone of the rock mass can be predicted.
作者
孙杰
武科
郑杨
韩宇聪
朱仁军
郝梦雪
SUN Jie;WU Ke;ZHENG Yang;HAN Yucong;ZHU Renjun;HAO Mengxue(School of Civil Engineering,Shandong University,Jinan 25006;Northeast Electric Power University,Jilin 132012)
出处
《土工基础》
2020年第5期575-579,共5页
Soil Engineering and Foundation
基金
山东省自然科学基金(ZR2017MEE051)
山东省重点研发计划(公益类专项)项目(2018GHY115015)。
关键词
TBM
隧道工程
下穿桥梁
弹塑性分析
Tunnel Boring Machine
Tunnel Engineering
Undercrossing a Viaduct
Elastoplastic Analysis
