来米坡连拱隧道洞身围岩扰动与变形控制研究  

Control of surrounding rock disturbance and deformation at the body of multi-arch Laimipo Tunnel

作　　者：易铭 李军 王浩 傅鹤林[4] 易海东 YI Ming;LI Jun;WANG Hao;FU Helin;YI Haidong(Yueyang City Operation Investment Group Co.,Ltd.,Yueyang 414000,China;Yueyang Traffic Highway Engineering Construction Co.,Ltd.,Yueyang 414000,China;The 23rd Metallurgical Construction Group Co.,Ltd.of Minmetals,Changsha 410022,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]岳阳市城市运营投资集团有限公司,湖南岳阳414000 [2]岳阳市交通公路工程建设有限公司,湖南岳阳414000 [3]五矿二十三冶建设集团有限公司,湖南长沙410022 [4]中南大学土木工程学院,湖南长沙410075

出　　处：《交通科学与工程》2024年第6期25-33,共9页Journal of Transport Science and Engineering

基　　金：湖南省教育厅重点课题(23A0014)。

摘　　要：为了深入探究浅埋超大跨连拱隧道施工对洞身围岩的扰动,基于来米坡隧道的实际施工情况,采用有限元软件构建了来米坡隧道施工阶段模型,具体分析了隧道开挖过程中洞身围岩应力、位移和应变等因素的变化趋势,以期为实际施工提供参考和指导。研究结果表明:主洞开挖后,拱脚处应力较大,且中隔墙墙脚位置出现了显著的应力集中现象;围岩的横向位移在左右导坑开挖后基本趋于稳定,而由于核心土的支撑作用,围岩的竖向位移主要发生在核心土开挖完毕后;当中导洞开挖完成后,大应变区主要集中在中导洞底部,而当主洞开挖完成后,大应变区主要集中在隧道拱脚、拱肩和拱顶等区域,整体应变特征表现为竖向应变大于水平应变。Based on the construction of Laimipo Tunnel,this paper delves into the disturbance of surrounding rock in the tunnel body of shallow-buried super-span multi-arch tunnel during construction.A construction stage model of Laimipo Tunnel was established using finite element software,and the variation characteristics during tunnel excavation were analyzed in detail from multiple aspects such as stress,displacement,and strain of the surrounding rock of the tunnel body,in order to provide reference and guidance for actual construction.The results show that after the excavation of the main tunnel,large stress mainly occurs at the arch foot,and there is stress concentration at the foot of the middle partition wall.The lateral displacement of surrounding rock is basically completed after the excavation of the left and right heading.Due to the supporting role of core soil,the vertical displacement of surrounding rock mainly occurs after the completion of core soil excavation.After the excavation of the middle guide tunnel,the large strain zone mainly appears at the bottom of the middle guide tunnel,and after the excavation of the main tunnel,the large strain zones are mainly concentrated at the arch foot,spandrel,and vault of the tunnel.Overall,the vertical strain is greater than the horizontal strain.

关 键 词：连拱隧道 数值模拟 围岩扰动 双侧壁导坑法 

分 类 号：TU74[建筑科学—建筑技术科学]