摘要
Abstract
To address the optimization of grouting parameters for single-fracture rock masses under dynamic water conditions,a com-bined approach of theoretical analysis,physical modeling,similarity modeling,and engineering validation was used.Initially,a similari-ty 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 for-mulas for grout diffusion distance,viscosity,and pressure changes over time during the grouting process.These formulas were incorpo-rated into COMSOL for grout diffusion simulation and compared with physical similarity modeling results.The study found that as grout-ing 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%accu-racy 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Key words
grouting/fissured rock/dynamic water/parameter optimization/numerical simulation分类
矿山工程
