摘要
为研究大直径、小净距平行顶管下穿复杂建筑物施工时建筑物各部分的沉降变化及分布情况,该文以深圳市铁岗-石岩水库水质保障工程2#顶管项目为依托,分析顶管下穿施工时建筑物沉降机理,通过数值模拟分析有无注浆加固及顶管纵向间距、埋深等参数对建筑物沉降的变化趋势及分布规律的影响,并将理论预测值、数值模拟值及现场监测值进行对比分析。结果表明:采用袖阀管注浆加固后建筑物的沉降值及沉降差异率均大幅减小。随着顶管纵向间距的增大,测点的沉降值及变化曲线的斜率均逐渐减小,其中测点3的沉降值减幅最大为83.5%;顶管埋深从9 m增加到21 m时建筑物的最大沉降值减小1.9 mm,整体沉降分布逐渐均匀。顶管埋深9 m时,采用袖阀管注浆加固+纵向间距108 m顶进的方案能最大限度减小顶管施工对建筑物的影响。
This study aims to study the settlement changes and distribution of various parts of a complex building during the construction of a large-diameter and small-clearance parallel pipe jacking undercrossing complex building.On the basis of the pipe jacking project of water quality guarantee engineering 2#for Tiegang–Shiyan Reservoir in Shenzhen,the settlement mechanism of pipe jacking undercrossing construction was analyzed.Through numerical simulation,the influence of the presence or absence of grouting reinforcement,and parameters such as longitudinal spacing and burial depth of pipe jacking on the variation trend and distribution law of building settlement was analyzed.The theoretically predicted values,numerical simulation values,and on-site monitoring values were compared.The results show that the settlement value and settlement difference rate of the building after grouting reinforcement with sleeve valve pipes are significantly reduced.As the longitudinal spacing of pipe jacking increases,the settlement value and slope of the variation curve of the measuring point gradually decrease.The settlement value of measuring point 3 is the most decreased,with a reduction of 83.5%.When the burial depth of pipe jacking increases from 9 m to 21 m,the maximum settlement value of the building decreases by 1.9 mm,and the overall settlement distribution gradually becomes uniform.When the burial depth of pipe jacking is 9 m,using the scheme of grouting reinforcement with sleeve valve pipes and a longitudinal spacing of 108 m for pipe jacking can minimize the effect of pipe jacking construction on the building.
作者
唐刚
黄文杰
张文博
李文杰
梁斌
TANG Gang;HUANG Wenjie;ZHANG Wenbo;LI Wenjie;LIANG Bin(CCCC-SHB Forth Engineering Co.,Ltd.,Luoyang,Henan 471013,China;School of Civil Engineering and Architecture,Henan University of Science and Technology,Luoyang,Henan 471000,China)
出处
《中外公路》
2025年第6期234-244,共11页
Journal of China & Foreign Highway
基金
国家自然科学基金资助项目(编号:U1604135)
中交二公局第四工程有限公司重点科技研发项目(编号:2023-04-10)
河南省科技厅产学研合作项目(编号:2015HNCXY011)。
关键词
顶管施工
下穿
复杂建筑物
沉降机理
注浆加固
现场监测
pipe jacking construction
undercrossing
complex building
settlement mechanism
grouting reinforcement
on-site monitoring
