盾构穿越砂层对地表位移影响模型试验研究  

Model test study on influence of shield passing through sand layer on surface displacement

作　　者：王京涛 程桦[1] 翟红侠[1] 郝英奇[1] 曹广勇[1] 王宁青 余平 Wang Jingtao;Cheng Hua;Zhai Hongxia;Hao Yingqi;Cao Guangyong;Wang Ningqing;Yu Ping(Anhui Provincial Building Structure and Underground Engineering Laboratory,Anhui Jianzhu University,Hefei 230601,China;Hefei Rail Transit Group Co Ltd,Hefei 230601,China;Tongling Ningqing Construction Labor Service Co Ltd,Tongling 244000,China)

机构地区：[1]安徽建筑大学安徽省建筑结构与地下工程实验室,安徽合肥230601 [2]合肥市轨道交通集团有限公司建设分公司,安徽合肥230601 [3]铜陵宁青建筑劳务有限公司,安徽铜陵244000

出　　处：《湖南文理学院学报（自然科学版）》2021年第1期75-80,共6页Journal of Hunan University of Arts and Science(Science and Technology)

基　　金：合肥市轨道交通科研项目(2014CGFZ3107)。

摘　　要：隧道盾构施工过程中不可避免遇到砂土地层,砂土自稳能力差,掘进时易发生安全事故。通过在砂层中模拟盾构掘进及壁厚注浆,研究平行隧道在埋深比和净间距不同情况下施工阶段地表位移的变化。研究结果表明,左线开挖地表沉降曲线符合正态分布形式,各阶段沉降最大值同土体损失率呈线性关系,土体损失率不变时,地表沉降随埋深比增加而减小,平行隧道右线掘进时,对既有左线地表上方产生位移影响,最终沉降槽形状相互交叠。壁后注浆过程中,埋深比不变时,位移值随注浆率的增加而变大,注浆率不变时,注浆对地表抬升的效果随埋深比增加而降低。In the process of tunnel shield construction,it is inevitable to encounter sand strata,which has poor self-stability and are prone to safety accidents during tunneling.By simulating shield excavation and wall thickness grouting in sand beds,the changes of surface displacement in the construction stage of parallel tunnels under different buried depth ratios and net spacing are studied.The results show that the surface settlement curve of left-line excavation conforms to the normal distribution form,and the maximum settlement at each stage is linear with the soil loss rate.When the soil loss rate is constant,the surface settlement decreases with the increase of buried depth ratio.When the right line of the parallel tunnel is excavated,the displacement above the surface of the existing left line is affected,and the final settlement trough shape overlaps with each other.In the process of grouting after wall,when the buried depth ratio is constant,the displacement value increases with the increase of grouting rate.And when the grouting rate is constant,the effect of grouting on surface uplift decreases with the increase of buried depth ratios.

关 键 词：盾构掘进 模型试验 地表沉降 砂土地层 壁后注浆 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]