覆盖层多路径循环劈裂灌浆技术研究OA

Traditional splitting grouting technology suffers from single-path slurry diffusion and uneven reinforcement in overburden deposits.In this study,a multi-path cyclic splitting grouting technique is proposed and investigated through theoretical analysis and field experiments.Based on elastic and fracture mechanics,the formation mechanism of multi-path splitting is revealed:after each splitting event,pressure filtration consolidation of the grout and redistri-bution of in-situ stress jointly act to increase the re-initiation resistance of existing cracks,thereby promoting the ini-tiation of new splitting paths and forming a multi-directional grout vein network through repeated cycles.Experimen-tal results demonstrate that more than six effective splitting cycles were achieved,the splitting pressure increases to 1.5-3 times the initial value,the post-grouting permeability is reduced to within 1 Lu,and the density and homogene-ity of the formation are significantly improved.The proposed technique provides a promising approach for achieving uniform reinforcement of overburden deposits and demonstrates strong potential for engineering applications.