铁道科学与工程学报2024，Vol.21Issue(2)：626-636,11.DOI:10.19713/j.cnki.43-1423/u.T20230325
考虑多孔介质渗透率变化的宾汉流体渗透注浆扩散模型
Diffusion model of Bingham fluid penetration grouting considering permeability variation of porous media
摘要
Abstract
Permeation grouting is widely used for the reinforcement of porous media in rock and soil engineering.Previous studies focused on the effects of the grout properties,such as the time-varying viscosity,filtration effect,and self-gravity,on the diffusion range of permeation grouting,based on the rheological and equilibrium equations of the grout.However,the influence of flow resistance of the grout in the pores on the permeability of porous media has not been considered,leading to significant differences between the existing theoretical and experimental test results.In this study,based on the motion equation,continuity equation,and equilibrium equation of viscous fluids,the flow resistance of the grout in the pores was introduced to derive a function expression of permeability of porous media,which depends on the pore characteristics,grouting construction parameters,and grouting diffusion radius.A diffusion control equation of the grout considering the change of permeability of porous media was then established.The comparison of the theoretical results of this study against those in the literature showed that the former considering the flow resistance of the grout is much closer to the experimental results than the latter.This verified the effectiveness of the theoretical method proposed in this study.The parameter analysis results show that when the flow resistance of the grout in the pores is considered,the permeability of the porous media in rock and soil exhibits rapid initial decrease,followed by slow increase with the elapsed time of grouting,while it decreases gradually with increasing grouting pressure.For the common cement grout materials that conform to the Bingham fluid properties in engineering,the change in permeability of the porous media is the main control factor affecting the diffusion of the grout when the grouting time is less than 5 minutes,while the viscosity and time-dependent properties of the grout become the main control factors after 7 minutes.The research results of this study can provide theoretical guidance for selecting and controlling the grouting parameters in the practical applications of permeation grouting for rock and soil reinforcement of porous media.关键词
渗透注浆/岩土多孔介质/多孔介质渗透率/宾汉流体/运动方程/连续方程Key words
penetration grouting/rock and soil porous media/permeability of porous media/Bingham fluid/motion equation/continuous equation分类
建筑与水利引用本文复制引用
李亮,单广灿,彭琦,刘乐,赵炼恒..考虑多孔介质渗透率变化的宾汉流体渗透注浆扩散模型[J].铁道科学与工程学报,2024,21(2):626-636,11.基金项目
湖南省杰出青年科学基金资助项目(2021JJ10063) （2021JJ10063）
湖南省交通运输厅科技进步与创新计划项目(201828,202017,202115) （201828,202017,202115）
