摘要
为了探究大断面长距离矩形顶管施工中注浆压力、摩阻力、开挖面顶推力和步长对地表沉降的影响规律,并对施工参数优化。以济南轨道交通4号线段店站矩形顶管通道工程为依托,采用正交试验法设计数值模拟方案,利用FLAC 3D有限差分软件进行模拟分析。结果表明:顶管施工过程中地表监测数据与模拟结果基本吻合;步长是最敏感因素,开挖面顶推力为重要因素,注浆压力次之,摩阻力影响最小;步长与地表沉降呈正相关,开挖面顶推力、注浆压力与其呈负相关,摩阻力在25 kPa前呈负相关,25 kPa后呈正相关;最佳施工参数:步长1.5 m,开挖面顶推力200 kPa,注浆压力230 kPa以及摩阻力25 kPa。研究结果可为济南地区矩形顶管法开挖地铁出入口通道提供参考。
In order to explore the influence laws of grouting pressure,frictional resistance,thrust force at the excavation face and step length on ground surface settlement during the construction of large-section and long-distance rectangular top pipe,and to optimize the construction parameters.Taking the rectangular top pipe channel project of the Duandian Station of Jinan Metro Line 4 as the basis,the orthogonal test method was adopted to design the numerical simulation scheme,and the FLAC 3D finite difference software was used for simulation analysis.The results show that the ground surface monitoring data during the top pipe construction process are basically consistent with the simulation results;The step length is the most sensitive factor,the thrust force at the excavation face is an important factor,the grouting pressure is the second,and the frictional resistance has the least influence;The step length is positively correlated with the ground surface settlement,the thrust force at the excavation face and the grouting pressure are negatively correlated with it,and the frictional resistance is negatively correlated before 25 kPa and positively correlated after 25 kPa;The optimal construction parameters are:step length 1.5 m,thrust force at the excavation face 200 kPa,grouting pressure 230 kPa and frictional resistance 25 kPa.The research results can provide a reference for the construction of rectangular top pipe method to excavate the metro entrance and exit channel in the Jin’an area.
作者
李琳
张文涛
冯明月
LI Lin;ZHANG Wentao;FENG Mingyue(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;China Railway 24th Bureau Group Corporation Limited,Shanghai 200433,China;Hebei Provincial Communications Planning,Design and Research Institute Co.,Ltd.,Shijiazhuang 050200,China)
出处
《粉煤灰综合利用》
2025年第4期111-116,共6页
Fly Ash Comprehensive Utilization
基金
河北省自然科学基金优秀青年科学基金项目(E2021210041)。
关键词
大断面
长距离
矩形顶管
正交试验法
地表沉降
large section
long distance
rectangular pipe jacking
orthogonal text
surface subsidence
