Slurry diffusion within cracked wall rock during the bolt-grouting process
Abstract：Continuum mechanics were used with seepage theory to obtain a basic equation for slurry diffusion within cracked wall rock.The permeability tensor method was used to obtain the diffusion behavior.A mathematical model of slurry diffusion in a bolt grouting system within a wall rock having orthogonal fractures was developed.Certain assumptions and simplifications of field grouting and support methods were used during this derivation.A numerical simulation of the bolt grouting process was conducted using COMSOL.The slurry diffusion at different grouting pressures and for different bolt layouts were studied.The results show that a rational grouting pressure is from 1.0 to 4.0 MPa for roadway bolt supports.The borehole spacing should be nearly 1.3 times the slurry diffusion radius.These results were applied to the design of roadway supports in the Qinan coal of the Huaibei mine to good effect.
Keywords：bolt-grouting supportgrouting timegrouting pressureslurrypermeationdiffusion
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)