不同渗透性地层中预制管桩连续贯入饱和土的响应分析  

Analysis on Response of Continuous Penetration of Precast Tubular Piles into Saturated Soil in Different Permeability Strata

作　　者：汤泽华 莫艺翔 TANG Zehua;MO Yixiang(Shenzhen China Railway No.2 Bureau Engineering Co.,Ltd.,Shenzhen 518000,Guangdong,China;Key Laboratory of Transportation Tunnel Engineering,Southwest Jiaotong University,Ministry of Education,Chengdu 610031,China)

机构地区：[1]深圳中铁二局工程有限公司,广东深圳518000 [2]西南交通大学交通隧道工程教育部重点实验室,成都610031

出　　处：《路基工程》2025年第2期178-182,共5页Subgrade Engineering

摘　　要：基于东莞市城市轨道交通1号线一期工程,采用FLAC3D建立预制管桩连续贯入饱和土模型,采用扩孔法模拟管桩的贯入过程,分析沉桩过程中饱和土体位移及超静孔隙水压力的变化规律。结果表明:沉桩时地表产生隆起位移,且沉桩前期增幅较大,后期增幅较小;孔隙水压力的主要分布半径约5.0 m,消散后孔隙水压力值大于沉桩前初始值;土体渗透性对沉桩过程影响显著,土体渗透性越差,地表隆起位移越大。Based on the Phase I Project of Dongguan Rail Transit Line 1,FLAC3 D was used to establish a model simulating continuous penetration of precast tubular pile into saturated soil.The penetration process of tubular pile was imitated by the reaming method,so as to analyze the variation law of saturated soil displacement and excess pore water pressure during pile sinking.The result shows that,the uplift displacement of the ground surface occurs during pile sinking,and the increase in the early stage of pile sinking is larger,and the increase in the later stage is smaller;the pore water pressure is mainly distributed at a radius of about 5.0 m,and the pore water pressure value after dissipation is greater than the initial value before pile sinking.The permeability of the soil has a significant effect on the pile sinking process.The worse the permeability of the soil,the greater the surface uplift displacement.

关 键 词：饱和土 预制管桩 沉桩 位移 孔隙水压力 

分 类 号：TU473[建筑科学—结构工程]