土质对盾构隧道下穿道路沉降影响的分析  

ANALYSIS OF INFLUENCE OF SOIL QUALITY ON SETTLEMENT OF UNDERPASS ROAD OF SHIELDTUNNELS

作　　者：孙超[1] 赵一恺 郭浩天[1] SUN Chao;ZHAO Yikai;GUO Haotian(School of Exploration Engineering,Jilin Jianzhu University,Changchun 130118,China)

机构地区：[1]吉林建筑大学测绘与勘查工程学院,长春130118

出　　处：《低温建筑技术》2023年第9期53-57,共5页Low Temperature Architecture Technology

基　　金：吉林省科技发展计划项目(YDZJ202201ZYTS490)。

摘　　要：为研究不同土质条件对盾构隧道下穿既有道路沉降的影响,文中基于长春市城市轨道交通2号线盾构隧道穿越的实际地层,运用Midas GTS NX软件,分析不同土质条件下盾构隧道的施工对道路沉降的影响。结果表明在盾构隧道掘进过程中,道路路面横向沉降曲线呈现凹槽形状,其中最大沉降值位于隧道中心线正上方;盾构隧道开挖过程中,距隧道中心线2.5D范围内的路面受影响较大;盾构隧道上覆土层土质条件改变对路面沉降的影响较弱,而穿越土层土质条件发生改变对地表沉降影响较大。相对于粉质黏土,隧道在强风化泥岩中进行盾构开挖对地面沉降影响较小。研究成果可为盾构隧道施工对既有路面沉降的监测防治等提供参考与指导。The actual stratum of the Changchun City Rail Transit Line 2 shield tunnel crossing is taken to examine the impact of distinct soil conditions on the settlement of pre-existing roadways induced by shield tunnel excavation.The study utilized the Midas GTS NX software to investigate the effects of varying soil conditions on road settlement resulting from shield tunnel construction.The findings indicate that the horizontal road surface settlement curve ex⁃hibits a concave profile during the tunnel excavation process with the maximum value occurring directly above the tunnel axis.The excavated area within a 2.5D distance from the tunnel centerline is particularly susceptible to road surface settlement.The change of overlying soil conditions has a weak impact on road settlement,while the change of soil conditions in the traversed strata has a greater impact on ground settlement.Compared with shield tunnel ex⁃cavation of silty clay tunnels in highly weathered mudstone,the impact on ground settlement is smaller.The research results may provide the reference and guidance for monitoring and controlling the settlement of existing roads during shield tunnel construction.

关 键 词：盾构隧道 强风化泥岩 路面沉降 

分 类 号：TU473.2[建筑科学—结构工程]