淤泥质土地层基坑微型桩支护设计及结构受力演化过程分析  

Design of Micro-Pile Support for Foundation Pit and Structural Stress Evolution Analysis in a Silty Soil Layer Excavation

作　　者：朱飞 ZHU Fei(Fujian Chuangsheng Construction Co.,Ltd,Fuzhou,Fujian,35000,China)

机构地区：[1]福建创盛建设有限公司,福建福州35000

出　　处：《石家庄铁路职业技术学院学报》2024年第4期1-5,10,共6页Journal of Shijiazhuang Institute of Railway Technology

摘　　要：针对淤泥质土地层中基坑开挖导致桩侧土体发生位移,进而导致支护结构变形等问题。以福州市某淤泥质土地层基坑工程为例,根据工程概况,对淤泥质土地层的基坑进行微型桩支护结构设计,并开展监测工作,分析咬合桩水平位移、各道支撑轴力随时间的变化规律,同时采用数值模拟的方法进行验证。研究结果表明:咬合桩水平位移随着开挖深度增加呈现先增加后减小的变化趋势,且开挖时间过长易导致桩侧土体产生附加位移;以负值表示承受压力,随着开挖时间增长,各支撑结构承受压力逐渐增加,其中第3道钢支撑承受压力最大;数值模拟及现场监测阶段的咬合桩水平位移、各道支护结构轴力和周边地表沉降表现出一致性。The displacement of the surrounding soil and the deformation of the supporting structure during excavation in a silty soil layer are discussed.In this paper,taking a foundation pit project of a silty soil layer in Fuzhou City as a case study,according to the general situation of the project,the design of a micro-pile support structure of the foundation pit of the silty soil layer is carried out.Monitoring work was conducted to analyze the horizontal displacement of the occlusal pile and the variation in axial forces of supporting structures with time.A numerical simulation was also used for verification.The results show that the horizontal displacement of occlusal piles increases first and then decreases with the increase of excavation depth,while prolonged excavation tends to cause additional displacement of the pile side soil.Negative values indicate pressure,with the increase of excavation time,the pressure on each supporting structure gradually increases,and the third steel support structure experiences the highest pressure.The horizontal displacement of occlusal piles,the axial forces of supporting structures and the surrounding surface settlement in the numerical simulation and field monitoring stages are consistent.

关 键 词：淤泥质土地层 基坑支护 结构受力 现场监测 数值模拟 

分 类 号：TV551.42[水利工程—水利水电工程]