破碎围岩条件下隧道挑顶施工技术研究  

Research on Roof-ripping Construction Technology for Tunnels under Fractured Surrounding Rock Conditions

作　　者：刘毅[1,2] 贺祖浩[1,3] 王志敏 马超 刘文[1,3] LIU Yi;HE Zuhao;WANG ZhiMin;MA Chao;LIU Wen(CCCC Second Harbour Engineering Company Ltd.,Wuhan 430040;Key Laboratory of Large-span Bridge Construction Technology,Wuhan 430040;Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure,Wuhan 430040)

机构地区：[1]中交第二航务工程局有限公司,武汉430040 [2]长大桥梁建设施工技术交通行业重点实验室,武汉430040 [3]交通运输行业交通基础设施智能制造技术研发中心,武汉430040

出　　处：《现代隧道技术》2020年第6期200-206,共7页Modern Tunnelling Technology

摘　　要：小断面隧道向大断面隧道转换是隧道施工面临的难点之一。文章依托深圳地铁2131标新莲区间工程,研究由G5小断面隧道向C5大断面隧道转换施工优化方案,并采用三维有限元方法计算分析不同施工工法的优劣性,将计算结果和监测数据进行对比分析,结果表明,纵向爬坡挑顶施工方法能更好地控制隧道施工后围岩变形和地表沉降,可尽量避免因破碎围岩纵向挤压造成的初期支护变形开裂,从而降低施工风险。The transition from small section tunnel to large section tunnel is one of the difficulties in tunnel construction.Based on the Xinlian running tunnel section of Shenzhen metro lot 2131,this paper studies the construction scheme optimization for transformation from G5 small-section tunnel to C5 large-section tunnel,uses three-dimensional finite element method to calculate and analyze the advantages and disadvantages of various construction methods,and compares the calculation results with monitoring data.The results show that using the construction method of longitudinal climbing and roof-ripping,it can better control the deformation of surrounding rock and ground settlement after tunnel construction,avoid the initial support deformation and cracking caused by the longitudinal extrusion of fractured surrounding rocks as far as possible and reduce the construction risk.

关 键 词：地铁隧道 断面转换 挑顶施工 数值模拟 方案比选 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]