浅埋公路隧道原位改扩建围岩变形破坏特征  

Deformation and failure characteristics of surrounding rockin the reconstruction and expansion of shallow highway tunnel in situ

作　　者：贤有汞 杨红运 焦文灿 林志[2] 马亚轲 邵羽 何柯 Xian Yougong;Yang Hongyun;Jiao Wencan;Lin Zhi;Ma Yake;Shao Yu;He Ke(Guangxi Xinfazhan Communication Group Co.,Ltd.,Nanning Guangxi 530025,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Guangxi Transportation Design Group Co.,Ltd.,Nanning Guangxi 530029,China;PowerChina Chongqing Engineering Co.,Ltd.,Chongqing 400060,China)

机构地区：[1]广西新发展交通集团有限公司,广西南宁530025 [2]重庆交通大学山区桥梁及隧道工程国家重点实验室,重庆400074 [3]广西交通设计集团有限公司,广西南宁530029 [4]中国电建集团重庆工程有限公司,重庆400060

出　　处：《山西建筑》2023年第21期136-139,共4页Shanxi Architecture

基　　金：国家自然科学基金(No.52078089,No.52078090,No.52274176);重庆市精英创新创业领军人才工程(CQYC20220302517);重庆市自然科学基金(cstc2021jcyj-msxmX1075);重庆市自然科学基金创新发展联合基金(2022NSCQ-LZX0285)资助。

摘　　要：为了能使现役公路隧道满足当前交通量迅速增长的需求,需对原有隧道进行改建和扩建。以廷心隧道为工程背景,分析了现场工况及围岩变形破坏情况,采用力学分析软件GDEM数值模拟隧道原位扩建工程,选取不同围岩等级的力学参数,研究隧道围岩的应力、塑性变形、位移及形变等方面并分析围岩变形破坏规律。结果表明:围岩等级越低,拱顶、拱底以及衬砌上的竖向应力就越小,拱腰的竖向应力越大,隧道中间隔墙受到的破坏程度越大;在隧道扁平率的影响下,在隧道原位扩建时,隧道的拱顶、拱底以及拱肩的围岩变形相对较大,拱脚和拱腰的变形相对较小。In order to make the existing highway tunnel meet the demand of the rapid growth of the current traffic volume,the original tunnel needs to be reconstructed and expanded.Taking the Tingxin Tunnel as the engineering background,the field working conditions and surrounding rock deformation and destruction are analyzed.The mechanical analysis software GDEM is used to simulate the in-situ expansion project of the tunnel.The mechanical parameters of different surrounding rock grades are selected to study the stress,plastic deformation,displacement and deformation of the surrounding rock of the tunnel and analyze the deformation and destruction laws of the surrounding rock.The results show that the lower the grade of surrounding rock,the smaller the vertical stress on the arch crown,arch bottom and lining,the greater the vertical stress on the arch waist,and the greater the damage degree of the tunnel middle partition;under the influence of the tunnel flattening ratio,when the tunnel is expanded in situ,the deformation of the surrounding rock of the tunnel’s arch crown,arch bottom and arch shoulder is relatively large,and the deformation of the arch foot and arch waist is relatively small.

关 键 词：公路隧道 隧道改扩建 围岩等级 围岩变形 应力调整 

分 类 号：TU457[建筑科学—岩土工程]