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作 者:钱叶琳 张振华[2] 崔文天 苏颖 奚邦禄 徐恒晖 QIAN Ye-lin;ZHANG Zhen-hua;CUI Wen-tian;SU Ying;XI Bang-lu;XU Heng-hui(Anhui Province Highway&Port Engineering Co.,Ltd.,Hefei 230022,China;College of Civil Engineering,Hefei University of Technology,Hefei 230009,China)
机构地区:[1]安徽省路港工程有限责任公司,合肥230022 [2]合肥工业大学土木与水利工程学院,合肥230009
出 处:《科学技术与工程》2024年第9期3781-3788,共8页Science Technology and Engineering
基 金:国家自然科学基金(51979068)。
摘 要:为研究桥梁桩基施工引起地层蠕变效应对邻近地铁隧道安全运营的影响,采用卸荷条件下黏土蠕变特性试验确定了隧道周围土体的蠕变模型,通过数值仿真FLAC^(3D)与现场监测相结合的方法,分析了桩基开挖期间地铁隧道的竖向位移、水平位移和应力分布状态。结果表明:广义Kelvin本构模型能够较为准确地描述黏土体开挖卸荷时的蠕变效应;桩基开挖后,邻近地铁隧道衬砌位移不断增大,随后进入稳定状态;随着桩基开挖数量的增加,地铁隧道竖向位移和水平位移总体表现为下沉和向外收敛趋势;桩-隧最小净距越小,桩基施工对隧道影响越大,采用隧道双侧布桩的施工方式,能够有效降低桩基开挖时隧道拱腰的累计水平位移,有利于地铁隧道的安全稳定运营。To investigate the impact of the stratum creep effect caused by the construction of bridge pile foundation on the safe operation of adjacent subway tunnels,the soil creep model around the tunnel was determined by the creep tests under unloading conditions.In addition,the numerical simulation FLAC^(3D)and field monitoring were employed to analyze the vertical displacement,horizontal displacement and stress distribution of subway tunnels during the pile foundation excavation.The results show that the generalized Kelvin model can accurately describe the creep behavior of clay under unloading process.After pile excavation,the lining displacement of the adjacent subway tunnel increases continuously and then tends to be stable.With more piles being excavated,the subway tunnels exhibits a sinking and outward displacement trend,and the smaller the minimum distance between pile and tunnel,the more significant the influence of the pile construction on the tunnel.In addition,arranging piles on both sides of the tunnel can effectively reduce the final horizontal displacement of the tunnel haunch during pile excavation,which is conducive to the safe and stable operation of the subway tunnel.
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