偏压小净距隧道开挖方式优化的研究  

Research on optimization of excavation method for small interval tunnel under biased pressure

作　　者：李茂 费维水[1] 杨文广 王太明 赵新宏 LI Mao;FEI Weishui;YANG Wenguang;WANG Taiming;ZHAO Xinhong(Faculty of Civil Engineering and Architecture,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500

出　　处：《交通科学与工程》2023年第1期68-75,99,共9页Journal of Transport Science and Engineering

摘　　要：为研究不同开挖方式对偏压小净距隧道的影响。本研究以重庆杨家坪隧道工程为依托,运用MidasGTS NX软件对其建立有限元模型,研究偏压小净距隧道的不同开挖方式在中岩墙加固前后对围岩应力、拱顶沉降和仰拱隆起等方面的影响。研究结果表明:对小净距隧道的中岩墙进行注浆加固,提高了土体强度,避免了中岩墙错动。在小净距隧道中岩墙开挖的各种方法中,采用CD法开挖的水平位移、拱顶下沉和仰拱隆起均优于CRD法和环形开挖留核心土法的。采取CD法开挖偏压小净距隧道可有效减小后行洞开挖对先行洞的影响。In order to study the influence of different excavation on small interval tunnels under bias pressure,based on the Yangjiaping tunnel project in Chongqing,this study used Midas-GTS NX software to establish a finite element model of the tunnel and investigated the effects of different excavation methods for small interval tunnels under biased pressure on surrounding rock stress,arch settling,and abutment uplift before and after the reinforcement of the middle rock wall.The research results showed that grouting reinforcement of the middle rock wall of the small interval tunnel can improve the soil strength and avoid the dislocation of the middle rock wall.The horizontal displacement of the middle rock wall,arch settling,and abutment uplift of the small interval tunnel excavated using the CD method were better than those of the CRD method and the annular excavation method with the core soil.The excavation of the small interval tunnel under biased pressure using CD method can effectively reduce the influence of the trailing hole excavation on the leading hole.

关 键 词：偏压小净距隧道 Midas GTS NX 合理净距 中岩墙加固 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]