摘要
Abstract
In order to study the deformation law of surrounding rock under the condition of highway tunnel excavation through goaf,this paper takes a highway tunnel project in Guangdong Province as an example,and uses ABAQUS numerical simulation software to establish a three-dimensional finite element model of tunnel with and without goaf,and compares and analyzes the displacement change and failure law under the condition of goaf and without goaf.The research shows that the stress of rock mass around the tunnel is released in advance after the tunnel passes through the gob.Therefore,the vertical and horizontal displacements are significantly reduced during tunnel excavation compared with that without the gob.The maximum values of tunnel top settlement,bottom uplift and horizontal displacement are reduced by 72.6%,50.5%and 75.6%,respectively,compared with that without the gob.In addition,the closer the gob is to the tunnel roof,the more beneficial it is to reduce the deformation of surrounding rock during tunnel excavation.When the distance is reduced from 15 m to 5 m,the settlement value of the tunnel roof and the uplift value of the bottom decrease by 84.8%and 75.4%,respectively.In summary,the deformation of rock mass around the tunnel can be significantly reduced under the condition that the tunnel passes through the gob,so as to ensure the stability and safety of the tunnel excavation.关键词
公路隧道/采空区/变形规律/数值模拟Key words
Highway tunnel/Gob area/Deformation rule/Numerical simulation分类
交通工程
