顶管施工过程中浆液扩散对减阻效果影响  

Influence of Slurry Diffusion on Drag Reduction During Pipe Jacking Cnstruction

作　　者：徐浩东 余童真 樊伟 李明广 刘念武[4] XU Haodong;YU Tongzhen;FAN Wei;LI Mingguang;LIU Nianwu(School of Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;China Railway Eryuan Engineering Group Co.,Ltd.,Hangzhou 310000,China;Anhui Gourgen Traffic Construction Co.,Ltd.,Hefei 230000,China;School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]中铁二院华东勘察设计有限责任公司,杭州310000 [3]安徽省交通建设股份有限公司,合肥230000 [4]浙江理工大学建筑工程学院,杭州310018

出　　处：《上海交通大学学报》2024年第7期1067-1074,共8页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(52078466);上海市自然科学基金(22ZR1430800)资助项目。

摘　　要：浆液扩散是影响顶管注浆减阻的关键因素,为此建立顶管三维数值分析模型,引入扩散环模拟顶管施工过程中浆液的扩散过程,根据管周土体与管片接触情况修改管土摩擦因数,研究顶管施工过程中浆液扩散过程对减阻效果的影响.将计算得到的顶进摩阻力与实测数据进行对比,验证方法的可靠性,进一步研究了顶管施工过程中滤过效应对土体位移的影响及注浆扩散相关参数对顶管施工过程中土体位移及顶进摩阻力的影响.结果表明:考虑滤过效应时的地表沉降更小;滤过效应引起的渗透系数衰减越强则地表沉降及顶进摩阻力越小;浆液扩散的越快,泥浆套越完整,则顶管顶进期间的注浆减阻效果越好.Slurry diffusion is the key factor affecting the resistance reduction of pipe jacking grouting.Therefore,this paper establishes a three-dimensional numerical analysis model of pipe jacking,introduces a diffusion ring to simulate the slurry diffusion process during pipe jacking construction,modifies the friction coefficient according to the contact between the soil around the pipe and the segment,and studies the influence of the slurry diffusion process on the resistance reduction effect during pipe jacking construction.The calculated jacking friction is compared with the measured data to verify the reliability of the method proposed.The influence of the filtering effect on soil displacement and the influence of grouting diffusion-related parameters on soil displacement and jacking friction during pipe jacking construction are further studied.The results show that the surface subsidence is smaller when the filtration effect is considered;The stronger the attenuation of permeability coefficient caused by the filtration effect,the smaller the surface settlement and jacking friction resistance;The faster the slurry diffuses and the more complete the slurry jacket is,the better the resistance reduction effect of grouting during pipe jacking.

关 键 词：顶管施工 注浆减阻 数值模拟 浆液扩散 

分 类 号：TU443[建筑科学—岩土工程]