裂隙岩体动水注浆的动力学响应与参数优化  

Dynamic Response and Parameter Optimization of Fractured Rock Mass Dy⁃namic Water Grouting Optimization

作　　者：石俊岩 张爽 谢凌琛 王洋洋 SHI Junyan;ZHANG Shuang;XIE Lingchen;WANG Yangyang(ChangSha DIMINE Co.,Ltd.,Changsha 410000,China)

机构地区：[1]长沙迪迈科技股份有限公司,湖南长沙410000

出　　处：《铜业工程》2025年第2期76-84,共9页Copper Engineering

摘　　要：针对单裂隙岩体动水条件下注浆参数的优化,采用理论分析、物理模拟、相似模拟与工程验证相结合的方法,研究了单裂隙岩体动水注浆。首先,通过搭建单裂隙动水注浆模拟试验平台研究了动水流速、浆液水灰比、注浆压力对堵水效率的影响,并借助响应面BBD试验法设计三因素三水平试验(共17组平行试验)。结果表明:当动水流速为6.29 cm/s、水灰比为0.93、注浆压力为0.34 MPa时,堵水率预测结果为91.42%。之后,基于浆液流变特性建立了浆液微元体运动学方程,得到了浆液扩散距离、黏度及整个注浆过程中的压力随时间变化的公式,将所得公式导入COMSOL进行浆液扩散模拟,并在物理相似模拟平台进行对比验证。研究发现,随着注浆时间的增加,浆液扩散的形状由圆形变为椭圆形,再变为“U”形,物理模拟得到的堵水率为88.39%,数值模拟得到的堵水率为90.17%,堵水效果好,两种方法与预测结果吻合度均在95%以上。最后,进行了现场工程验证,所得矿井涌水量由32.75 m3/h降低至4.82 m3/h,堵水率为85.28%,优化效果良好。To address the optimization of grouting parameters for single-fracture rock masses under dynamic water conditions,a combined approach of theoretical analysis,physical modeling,similarity modeling,and engineering validation was used.Initially,a similarity simulation test platform for single-fracture dynamic water grouting was constructed to study the effects of dynamic water flow rate,grout water-to-cement ratio,and grouting pressure on the water blocking rate.Using response surface methodology with BBD(Box-Behnken Design),a three-factor three-level experiment with 17 parallel tests was designed.Results showed that with a dynamic water flow rate of 6.29 cm/s,a water-to-cement ratio of 0.93,and a grouting pressure of 0.34 MPa,the predicted water blocking rate was 91.42%.Subsequently,based on the type of grout fluid,a kinematic equation for grout micro-elements was established,providing formulas for grout diffusion distance,viscosity,and pressure changes over time during the grouting process.These formulas were incorporated into COMSOL for grout diffusion simulation and compared with physical similarity modeling results.The study found that as grouting time increased,the shape of grout diffusion changed from"circular"to"elliptical"to"U".The physical simulation yielded a water blocking rate of 88.39%,and the numerical simulation showed a blocking rate of 90.17%,with both methods achieving over 95%accuracy compared to the predicted results.Finally,engineering validation on-site showed that the mine inflow decreased from 32.75 m³/h to 4.82 m³/h,resulting in a water blocking rate of 85.28%.

关 键 词：注浆 裂隙岩体 动水 参数优化 数值模拟 

分 类 号：TD421[矿业工程—矿山机电]