基于电阻率法的顶管施工浆液扩散范围试验  

Test on slurry diffusion range of pipe jacking construction based on resistivity method

作　　者：汪雨珍 刘念武[2] 李明广 徐浩东 WANG Yuzhen;LIU Nianwu;LI Mingguang;XU Haodong(Anhui Gourgen Traffic Construction Co.,Ltd.,Hefei 230000,China;School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China;School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China)

机构地区：[1]安徽省交通建设股份有限公司,安徽合肥230000 [2]浙江理工大学建筑工程学院,浙江杭州310018 [3]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《甘肃科学学报》2024年第6期7-12,共6页Journal of Gansu Sciences

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

摘　　要：同步注浆是顶管施工中的重要一环,浆液在注浆压力的作用下向周边扩散。若能观测到浆液在土体中的分布情况,即可合理调整施工参数以保证注浆减阻的效果。但在实际施工中,由于观测条件及观测方法的限制,浆液在土体中的分布情况很难判断,目前对于这部分的研究和方法较少。因此,介绍一种能够用于测定泥浆分布情况的测量方法——高密度电阻率法。为得到同步注浆后浆液在周边土体中的扩散半径,通过室内试验模拟顶管顶进施工过程,并用电阻率法测定注浆前后的土体电阻率分布,通过对比差值得到浆液的扩散范围。结果表明:土体的电阻率在注浆后会发生显著变化,在测量同一土体电阻率时会出现一定差异;电阻率法能够有效测定注浆后的浆液扩散范围;隧道埋深不同,只要触变泥浆的减阻性能良好且注浆压力适宜,注浆效果的稳定性就良好;顶管顶进完成后顶管周边将出现4个区域,即纯泥浆区、浆土混合区、主扩散区、次扩散区。Synchronous grouting is an important part of pipe jacking construction,and the slurry spreads to the periphery under the action of grouting pressure.If the distribution of slurry in the soil can be observed,the construction parameters can be adjusted reasonably to ensure the effect of drag reduction by grouting.However,in the actual construction,due to the limitations of observation conditions and methods,it is difficult to judge the distribution of slurry in soil.At present,there are few studies and methods on this part.Therefore,this paper introduces a measurement method-high density resistivity method,which can be used to determine the distribution of mud.In order to obtain the diffusion radius of grout in the surrounding soil after synchronous grouting,this paper simulates the construction process of pipe jacking through laboratory tests,and the resistivity distribution of soil before and after grouting is measured by resistivity method,and the diffusion range of grout is obtained by comparing the difference.The results show that the resistivity of soil will change significantly after grouting,and there will be some differences when measuring the resistivity of the same soil.The resistivity method can effectively determine the diffusion range of grout after grouting.If the buried depth of the tunnel is different,as long as the drag reduction performance of thixotropic mud is good and the grouting pressure is suitable,the stability of grouting effect is good.After the pipe jacking is completed,there will be four areas around the pipe jacking,namely,pure mud zone,slurry-soil mixing zone,main diffusion zone and secondary diffusion zone.

关 键 词：顶管施工 注浆减阻 电阻率法 

分 类 号：TU447[建筑科学—岩土工程]