护盾式TBM施工中隧道受力与变形现场试验研究  

Field test on stress and deformation of shield TBM tunnels

作　　者：吴圣智 李建 王明年[3] 董宇苍 李克金 WU Shengzhi;LI Jian;WANG Mingnian;DONG Yucang;LI Kejin(School of Civil Engineering,Shandong Jianzhu University,Jinan,Shandong 250101,China;Shandong Hi-speed Engineering Construction Group Co.,Ltd.,Jinan,Shandong 250000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 630000,China;School of Urban Geology and Engineering,Hebei GEO University,Shijiazhuang,Hebei 050031,China;China Railway 14th Bureau Group Co.,Ltd.,Jinan,Shandong 250000,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101 [2]山东高速工程建设集团有限公司,山东济南250000 [3]西南交通大学土木工程学院,四川成都630000 [4]河北地质大学城市地质与工程学院,河北石家庄050031 [5]中铁十四局集团有限公司,山东济南250000

出　　处：《岩石力学与工程学报》2021年第12期2500-2509,共10页Chinese Journal of Rock Mechanics and Engineering

基　　金：山东省重点研发计划(重大科技创新工程)项目(2019JZZY010428);山东省自然科学基金资助项目(ZR2020QE265)。

摘　　要：护盾式TBM隧道管片与围岩之间间隙采用豆砾石回填后注浆形成回填层,回填层及其状态对隧道力学特性具有重要影响。为探明回填层对隧道受力与变形的影响规律,研究通过现场试验分析护盾式TBM隧道施工中的力学响应特征,得出以下几点结论:回填层松散时,管片受到地层的约束及支撑作用有限,管片的支护性能无法充分发挥,围岩易产生松弛与塌方,管片的结构受力、张开、错台以及地表沉降会出现明显的增加;回填层注浆固结后,围岩、管片、回填层形成稳定的受力体系,隧道的力学特征趋于稳定;豆砾石吹填体积是护盾式TBM施工阶段隧道受力与变形的重要影响因素,豆砾石填充体积越小,管片应力集中越明显,管片的张开、错台及地表沉降越大;护盾式TBM隧道施工中应制定豆砾石吹填体积控制基准,根据该基准与现场豆砾石吹填情况确定回填层的注浆时机。The gap between the segment and the surrounding rock in shield TBM tunnels is backfilled with pea gravel and then grouted to form backfill.The backfill and its state have an important impact on the mechanical characteristics of the tunnels.In order to find out the influence law of the backfill layer on the stress and deformation of tunnels,the mechanical characteristics of shield TBM tunnels in construction are analyzed through field test in this paper,and the following conclusions are drawn.When the backfill layer is in a loose state,the constraints and supports of the surrounding on the segments are limited,and the segments cannot provide enough support for the surrounding rock.As a result,the surrounding rock is prone to deformation and collapse,and the structural stress,opening,staggering and surface settlement of the segments will increase significantly.The stress system of the surrounding rock,the segment and the backfill layer is gradually stable after the backfill layer is grouted and consolidated.The volume of the pea gravel behind the segments has an important effect on the force and deformation of shield TBM tunnels in construction.The smaller the filling volume of the pea gravel is,the more obvious the stress concentration is,and the greater the opening,staggering and surface settlement of the segments are.The volume control standard of the pea gravel behind the segments should be formulated in the construction of shield type TBM tunnels,and the grouting time should be selected according to the volume control standard and the volume of the pea gravel filled behind the segments.

关 键 词：隧道工程 护盾式TBM 回填层 力学特性 现场试验 

分 类 号：U45[建筑科学—桥梁与隧道工程]