盾构下穿古城区地面沉降预测及现场监测分析  

Ground Subsidence Prediction and On-Site Monitoring Analysis of Shield Tunneling Under the Ancient City

作　　者：张翔 李义翔 陈健[2,4] 刘滨 舒计城[3] ZHANG Xiang;LI Yixiang;CHEN Jian;LIU Bin;SHU Jicheng(Wuhan Municipal Engineering Quality Supervision Station,Wuhan 430015,China;China Railway 14th Bureau Group Co.,Ltd.,Jinan 250101,China;China Railway 14th Bureau Group Shield Engineering Co.,Ltd.,Nanjing 210000,China;China Railway Construction Underwater Tunnel Engineering Laboratory,Ji-nan 250101,China;State Key Laboratory of Geotechnical Mechanics and Engineering,Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]武汉市市政工程质量监督站,湖北武汉430015 [2]中铁十四局集团有限公司,山东济南250101 [3]中铁十四局集团大盾构工程有限公司,江苏南京210000 [4]中国铁建水下隧道工程实验室,山东济南250101 [5]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《河南科技》2024年第17期50-55,共6页Henan Science and Technology

基　　金：山东省自然科学基金面上项目(ZR2023ME048);泰山产业领军人才工程专项经费资助(tscx202306015);中国铁建科研开发计划(2023-B04);中铁十四局科技研发计划项目(9137000016305598912021A01)。

摘　　要：【目的】为了获取武汉市和平大道南延线盾构段地面的沉降数据,本研究通过Peck公式对现场沉降监测结果进行了拟合分析,并对Peck公式进行了修正。【方法】每30 m设置沿隧道上部对称分布的监测点进行现场地表沉降监测,选取其中4个最具代表性的断面沉降结果进行Peck公式拟合分析和验证,并根据实际沉降情况对Peck公式进行修正。【结果】研究结果表明,在隧道轴线上部存在异常沉降,因此通过对后续掘进段掘进参数进行调整,加强壁后同步注浆和监控测量控制沉降,并且将得到的沉降槽曲线与Peck公式进行拟合,得到4个断面的实测沉降数据与拟合曲线的拟合优度R2均高于0.85。【结结论论】盾构段沉降槽曲线与Peck公式计算结果高度拟合,可以用Peck公式对研究区沉降进行预测,选取地层体积损失率Vl为0.95%,沉降槽宽度系数k为0.55对Peck公式进行修正后,可以更加简单高效地预测后续沉降。[Purposes]In order to obtain the ground subsidence law of the shield tunneling section of the South Extension of Heping Avenue in Wuhan City,this paper conducted fitting analysis of the field settlement monitoring results through the Peck formula,and revised the formula.[Methods]A monitoring point symmetrically distributed along the upper part of the tunnel is set every 30 m for on-site surface settlement monitoring.Four of the most representative section settlement results are selected for Peck for-mula fitting analysis,and the Peck formula is verified.The Peck formula is modified based on the actual settlement situation.[Findings]It shows that there is abnormal settlement at the upper part of the tunnel axis.Therefore,the settlement is controlled by adjusting the excavation parameters of the subsequent ex-cavation section,strengthening the synchronous grouting behind the wall and monitoring measurement,and the settlement trough curve obtained is matched with the Peck formula.The goodness of fit R2 be-tween the measured settlement data of the four sections and the fitting curve is higher than 0.85.[Con-clusions]The high fit between the settlement groove curve of the shield tunnel section and the Peck for-mula calculation results can be used to predict the settlement in Wuhan area.Choosing a stratum volume loss rate of 0.95%and a settlement groove width coefficient of 0.55 can make the Peck formula more simple and efficient in predicting subsequent settlement after correction.

关 键 词：盾构 现场监测 地表沉降预测 PECK公式 沉降控制 

分 类 号：U231.3[交通运输工程—道路与铁道工程]