摘要
以某市地下综合管廊项目为工程依托,对管廊项目周边进行监测点布置。基于盾构法施工的地下综合管廊现场监测值,利用最小二乘法最优化方法对Peck公式进行拟合。对工程监测数据进行沉降回归分析,并拟合各监测断面的回归曲线;对其沉降规律及曲线误差相关度进行分析,反算地表沉降槽宽度系数及地表沉降最大值。研究结果表明:在砂土层进行盾构施工,适用于该地区的地表沉降槽宽度系数i取值范围为2~5,最大地表沉降量Smax取值范围为10~14 mm;周围土体隆起和沉降发生在盾构机前后15~20 m范围,且在盾尾脱出部位沉降速率最大,其沉降量占总沉降量的70%~80%,隧道上覆土层较厚时,地表沉降量较小。
On the basis of a city’s underground comprehensive pipe gallery project,the monitoring points around the pipe gallery project are arranged.Based on the on-site monitoring data of the underground comprehensive pipe gallery constructed by the shield method,the Peck formula is fitted by the least square method optimization method.The settlement regression analysis of the engineering monitoring data is carried out,and the regression curve of each monitoring section is fitted;the settlement law and curve error correlation are analyzed,and the width coefficient of the surface settling tank and the maximum surface settlement are back-calculated.The research results show that when shield construction is carried out on the sandy soil layer,the value range of the surface settling tank width coefficient i applicable to this area is 2~5,and the value range of the maximum surface settlement Smax is 10~14 mm;the surrounding soil uplift and settlement occur within 15~20 m from the front and rear of the shield machine,and the settlement rate reaches the maximum at the point where the shield tail exits,which accountes for 70%~80%of the total settlement,when the overlying soil layer of the tunnel is thick,the ground settlement is small.
作者
宋新海
SONG Xinhai(China Railway 19th Bureau Group Fifth Engineering Co Ltd.,Dalian Liaoning 116000,China)
出处
《铁道建筑技术》
2021年第6期11-16,共6页
Railway Construction Technology
基金
中国铁建股份有限公司科技研究开发计划项目(14-C16)。
关键词
PECK公式
盾构施工
地表沉降槽宽度系数
最大沉降值
综合管廊
Peck formula
shield construction
surface settling tank width coefficient
maximum settlement value
integrated pipe gallery
