某隧道进口段开挖的力学响应分析  

Analysis of Mechanical Response of Tunnel Excavation Near Entrance

作　　者：齐得旭 傅荣华[1] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《成都大学学报（自然科学版）》2015年第1期91-93,共3页Journal of Chengdu University（Natural Science Edition）

摘　　要：在隧道开挖施工过程中,岩土体的结构发生了变化,应力也会发生相应的调整,将引起隧道周围岩土体产生变形或者发生破坏.以双向双洞公路单拱长隧道为例,利用COMSOL有限元软件,对隧道进口段一处剖面建立二维的有限元模型,研究在上覆层为软岩的情况下,截面尺寸为半圆拱型隧道进口段开挖期间的岩体力学响应情况.在隧道开挖过程中,临近开挖区的应力和变形范围是进行隧道加固预测的重要参数,为隧道进口段开挖和支护给出了一定的依据以指导工程施工.In the tunnel excavation process,the structure of rock and soil mass changes and the stress adjusts accordingly,which will consequently cause the deformation or damage of the rock and soil mass surrounding the tunnel. Taking long single arch tunnel of a two-way,twin-tunnel highway as an example,the paper uses the finite element software COMSOL to build the two-dimensional finite element model of the cross section of a tunnel entrance section,and furtherly studies the mechanical response of rock mass during excavation of tunnel near the semicircular arch cross-section entrance under the condition of soft rock overlying strata. In the process of tunnel excavation,the stress and deformation range near the excavation area are the important parameters to estimate the tunnel reinforcement,and provide the basis for the excavation and support of tunnel entrance section,which guides the tunnel construction.

关 键 词：隧道开挖 围岩 力学响应 数值模拟 COMSOL 

分 类 号：U455.4[建筑科学—桥梁与隧道工程] U459.2[交通运输工程—道路与铁道工程]