壁后注浆引起盾构隧道上浮对结构的影响  

EFFECT OF SHIELD TUNNEL UPLIFT CAUSED BY BACK-FILLED GROUTING ON STRUCTURE

作　　者：朱令[1,2] 丁文其[1,2] 杨波[1,2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《岩石力学与工程学报》2012年第A01期3377-3382,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50878149);上海城建重点科研计划(沪城建科2010–A–1a);上海市科委课题(11231202703)

摘　　要：壁后注浆作为盾构隧道施工中必备和关键工序,其质量的好坏不仅影响地层变形,还可能引起隧道在施工期的上浮,对结构产生较大影响。基于等效连续化模型和弹性地基梁理论,建立盾构隧道纵向分析模型,通过有限元数值模拟,求得最大上浮变形出现在盾尾后10环附近。借助环缝最大张开量这一参数,分析土层反力系数、环缝连接螺栓数量、隧道掘进速度及管片环宽度的影响,得到如下结论:(1)环缝最大张开量随土层反力系数、环缝连接螺栓数量的增大而减小,随隧道掘进速度、管片环宽度的增大而增大,且较为显著;(2)当隧道周围地层反力系数较小时,通过适当的地基处理方法来提高反力系数效果显著。As an essential procedure, the quality of back-filled grouting directly affects not only the deformation of strata around the tunnel but also the uplift of lining structure. Based on the present longitudinal equivalent continuous model theory and the elastic fotmdation theory, a longitudinal analysis model was designed. It can be obtained by numerical simulation of finite element method（FEM） that the largest deformation happens nearby the tenth lining ring. An important parameter, the maximum splaying amount of the joints, was used to analyze the effects of soil reaction coefficient, amount of longitudinal bolts, advance rate and width of rings. The following conclusions can be drawn. （1） The maximum splaying amount decreases with the increase of soil reaction coefficient and amount of longitudinal bolts, and increases obviously with the increase of advance rate and width of rings. （2） It is advisable to improve the soil reaction coefficient through artificial methods only when the soil is quite soft.

关 键 词：隧道工程 盾构隧道 壁后注浆 上浮 纵向分析模型 影响因素 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]