不同加固方式下盾构近距离侧穿电塔桩基位移研究  

Study on Pile Foundation Displacement of Shield Tunneling Passing Through Electric Tower in Short Distance Under Different Reinforcement Methods

作　　者：黄山 周顺新 李鹏举 杨昌锦 陈甦 HUANG Shan;ZHOU Shunxin;LI Pengju;YANG Changjin;CHEN Su(School of Rail Transportation,Soochow University,Suzhou 215021,China;Suzhou Urban Railway Transit Line One Company Limited,Suzhou 215000,China;China Railway 14th Bureau Group Company Limited,Jinan 250101,China)

机构地区：[1]苏州大学轨道交通学院,江苏苏州215021 [2]苏州轨道交通市域一号线有限公司,江苏苏州215000 [3]中铁十四局集团有限公司,山东济南250101

出　　处：《石家庄铁道大学学报(自然科学版)》2025年第1期15-21,103,共8页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：苏州轨道交通市域一号线有限公司项目(SURT02SG1S10014)。

摘　　要：以苏州轨道交通11号线盾构隧道工程为背景,通过有限元软件ABAQUS建立数值计算模型,计算分析了电塔地基和塔身均不加固(不加固)、仅注浆加固电塔地基(注浆加固)、仅锚索加固电塔塔身(锚索加固)和电塔地基注浆+电塔塔身锚索加固(注浆+锚索加固,实际加固方式)4种工况下,盾构隧道近距离侧穿电塔时引起的电塔桩基位移及其变化规律,并通过现场实测加以验证。研究结果表明,对电塔注浆加固后,盾构侧穿至加固断面时该断面沉降分布形态会发生一定变化,最大沉降值向远离加固区一侧偏移;实际加固工况下,数值模拟与实测得到的盾构侧穿电塔过程中引起的电塔桩基沉降变化规律基本一致,最大沉降值(平均值)两者相差16.1%;各加固工况下盾构侧穿电塔时,电塔桩基在垂直和平行于隧道方向的水平位移分别朝向隧道和背离盾构掘进方向,4种工况下,电塔桩基垂直和平行于隧道方向的水平位移最大值分别为1.81、1.73、1.63、1.15 mm和1.83、1.81、1.86、1.44 mm;注浆+锚索加固对桩基沉降和水平位移的控制最有效。Taking the shield tunnel project of Suzhou Rail Transit Line 11 as the background,a numerical calculation model was established by the finite element software ABAQUS to analyze the displacement and variation of the electric tower in short distance under four working conditions:the foundation of the tower and the tower body without reinforcement(no reinforcement),the foundation of the tower reinforced by grouting(grouting reinforcement),the tower body reinforced by anchors only(anchors reinforcement),and the foundation of the tower combined with the anchors of the tower body reinforced by grouting(grouting combined with the anchors,the actual reinforcement),and the results were verified by on-site measurement.The results show that,after grouting and reinforcing the electric tower,the settlement distribution pattern of the reinforced section will change when the shield tunneling passes through it,and the maximum settlement value will shift to the side far away from the reinforced area;Under the actual reinforcement condition,the variation law of the settlement of the tower pile foundation caused by the shield tunneling through the tower is basically the same,and the difference between the maximum settlement value(average value)and the measured value is 16.1%;When the shield tunneling passes through the electric tower under each reinforcement condition,the horizontal displacement of the electric tower pile foundation in the vertical and parallel direction of the tunnel is 1.81,1.73,1.63 and 1.15 mm and 1.83,1.81,1.86 and 1.44 mm respectively;Grouting combined with anchor cable reinforcement is the most effective in controlling the settlement and horizontal displacement of the pile foundation.

关 键 词：盾构隧道 桩体位移 加固措施 数值分析 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]