煤田地质与勘探

2025, v.53;No.329(05) 150-162

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富水砂层幂律型浆液渗透注浆扩散机理
Diffusion mechanisms of power-law grouts in water-rich sand layers during permeation grouting

谢鲍,程桦,王雪松,黎明镜,刘向阳,韩雪宇
XIE Bao,CHENG Hua,WANG Xuesong,LI Mingjing,LIU Xiangyang,HAN Xueyu

摘要(Abstract)：

【目的】为阐明富水砂层渗透注浆球形扩散规律及影响因素，开展渗透注浆试验研究，以了解不同注浆参数对浆液扩散的定量影响。【方法】首先，通过渗透注浆球形扩散模型试验，分析浆液宏观扩散形态、微观填充效果及注浆过程中渗透压力、土压力变化趋势；然后，基于考虑多效应耦合作用的渗透注浆球形扩散方程，定性分析浆液渗透扩散的影响因素，定量分析理论预测浆液扩散的误差；最后，使用极差分析法评估水灰比、砂土物理参数、注浆压力对浆液渗透扩散影响的显著性。【结果和结论】浆液扩散范围与浆液水灰比、砂土孔隙率呈正相关，与砂土迂曲度呈负相关；注浆过程中，随着与注浆管的距离变远，渗透压力及土压力非线性减小，而随着时间的变化，同一个测点的渗透压力及土压力非线性增大；定义了压力突增时间区间，与注浆管距离越近，该区域出现越早，压力变化越显著；考虑浆液黏度时变效应、迂曲效应及均匀渗滤效应的理论模型预测浆液扩散范围与试验误差为-13.26%～11.01%；各注浆参数对浆液扩散范围影响的显著性从大到小为：水灰比、砂土孔隙率、注浆压力；水灰比作为主要影响因素，同时影响注浆过程的砂土实际孔隙率、迂曲度进而影响浆液扩散范围。研究成果可为今后富水砂层注浆参数设计提供参考。
[Objective] This study aims to clarify the spherical diffusion patterns of power-law grouts in water-rich sand layers during permeation grouting and their influential factors. To this end, permeation grouting experiments were conducted to gain insights into the quantitative impacts of varying grouting parameters on grout diffusion. [Methods] Using model experiments on spherical diffusion during permeation grouting, this study analyzed the macroscopic diffusion morphologies and microscopic infilling effects of grouts, as well as the trends of permeation and soil pressures during grouting. Then, based on the spherical diffusion equations for permeation grouting that consider multi-effect coupling,this study analyzed the factors influencing the permeation and diffusion of grouts qualitatively and the theoretical prediction errors of grout diffusion quantitatively. Finally, through range analysis, this study assessed the significance of the impacts of the water-to-cement ratio, physical parameters of sandy soils, and grouting pressure on grout permeation and diffusion. [Results and Conclusions] The results indicate that the diffusion range of grouts was positively correlated with the water-to-cement ratio of the grouts and the porosity of sandy soils but negatively correlated with the tortuosity of sandy soil. During grouting, the permeation and soil pressures decreased nonlinearly with an increase in the distance from the grouting pipe. Nevertheless, the permeation and soil pressures at the same measurement point increased nonlinearly over time. The time interval of sudden pressure increase was defined. A closer distance from the grouting pipe corresponded to an earlier sudden pressure increase and more significant pressure changes. The theoretical model that considered the multiple effects of grouts, including the time-varying effect of viscosity, tortuosity effect, and uniform infiltration effect, yielded prediction errors of grout diffusion ranges varying from -13.26% to 11.01% compared to the experimental results. The significance of the impacts of grouting parameters on the grout diffusion range decreased in the order of the water-to-cement ratio, sandy soil porosity, and grouting pressure. As a dominant influential factor, the waterto-cement ratio affected the grout diffusion range during grouting by influencing the actual porosity and tortuosity of the sandy soils. The results of this study can serve as a reference for the design of grouting parameters for water-rich sand layers.

关键词(KeyWords)： 富水砂层;渗透注浆;多因素耦合;幂律浆液;扩散机理
water-rich sand layer;permeation grouting;multi-factor coupling;power-law slurry;diffusion mechanism

Abstract:

Keywords:

基金项目(Foundation): 安徽省高等学校科学研究项目(自然科学类)重点项目(2022AH050815)

作者(Author): 谢鲍,程桦,王雪松,黎明镜,刘向阳,韩雪宇
XIE Bao,CHENG Hua,WANG Xuesong,LI Mingjing,LIU Xiangyang,HAN Xueyu

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