动水条件下卵石地层帷幕注浆浆液扩散机理  

Grouting Diffusion Mechanism of Curtain Grouting in Pebble Strata under Flowing Water Conditions

作　　者：刘军 申精 张宇 陶连金[2] 丁鹏菲 Liu Jun;Shen Jing;Zhang Yu;Tao Lianjin;Ding Pengfei(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 102627,P.R.China;Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing P.R.China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京102627 [2]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《地下空间与工程学报》2025年第2期403-411,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(42072308)。

摘　　要：帷幕注浆是隧道工程地下水控制的一个重要措施,富水情况下由于卵石地层渗透系数大,易形成动水条件,使得浆液的扩散半径难以确定,这将导致帷幕质量难以控制。基于迂曲度理论,建立了动水条件下牛顿型浆液在卵石地层中柱形扩散的模型,并进一步分析了迂曲度、注浆压力、地下水压力、地层孔隙度、渗透率及浆液黏度对浆液扩散距离的影响。结果表明:动水条件下,浆液的顺水流方向扩散距离显著大于逆水流方向扩散距离,且迂曲度对浆液的扩散距离影响较大;逆水流方向扩散距离受注浆压力、地下水压力、渗透率和浆液黏度的影响较大,顺水流方向扩散距离受地下水压力的影响较小,受其余因素的影响同顺水流扩散距离;受迂曲效应的影响,逆水流和顺水流方向的扩散距离受孔隙度的影响较小。研究成果可为富水卵石地层注浆帷幕设计和施工提供理论支撑。Curtain grouting is an important measure for groundwater control in tunneling projects.The waterrich condition is easy to form dynamic water conditions due to the large permeability coefficient of the pebble stratum,which makes it difficult to determine the diffusion radius of the slurry,which will lead to the difficulty in controlling the quality of the curtain.Based on the theory of tortuosity,a model of Newtonian slurry columnar diffusion in pebble strata under dynamic water conditions was established,and the effects of tortuosity,grouting pressure,groundwater pressure,formation porosity,permeability and slurry viscosity on slurry diffusion distance were further analyzed.The results show that the diffusion distance of slurry in the downstream direction is significantly larger than that in the upstream direction under the dynamic water condition,and the tortuosity has a greater influence on the diffusion distance of slurry;The diffusion distance in the upstream direction is more influenced by the grouting pressure,groundwater pressure,permeability and slurry viscosity,and the diffusion distance in the downstream direction is less influenced by the groundwater pressure,and the influence of other factors is the same as that of the downstream flow diffusion distance;Affected by the influence of tortuosity effect,the diffusion distances in the upstream direction and in the downstream direction are less affected by the porosity.The research results can provide theoretical support for designing and constructing grouting curtains in water-rich pebble strata.

关 键 词：卵石地层 帷幕注浆 动水注浆 渗透扩散 

分 类 号：TU443[建筑科学—岩土工程]