Analysis of factors influencing the control range of grouting and hole sealing with gel-like materials in fractured rock masses
Liu Xiao
Zhang Yuheng
Xuan Dequan
Xie Jiawei
Lin Haixiao
Xu Sen
Abstract：Objectives In coal mine gas drainage projects,the fractured rock mass penetrated by through-layer boreholes serves as a key channel for gas seepage.The effective diffusion range of grouting materials within the fractured surrounding rock directly affects the integrity and airtightness of borehole sealing.To improve the quality of gas drainage,this study analyzes the factors influencing the control range of grouting and hole sealing in fractured rock masses.Methods Using a guanidine-based gel material for grouting and sealing,a fracture grouting model of the rock mass surrounding a gas drainage borehole was established.The response surface methodology(RSM)was employed to design a multi-factor experimental scheme and analyze the data.A random fracture field model was constructed in the surrounding rock using the COMSOL Multiphysics platform to simulate the effects of fracture density,grouting pressure,material vis-cosity,and fracture aperture on the effective diffusion range of the sealing material.Results The signifi-cance ranking of influencing factors on the effective injection range is as follows:fracture aperture,mate-rial viscosity,fracture density,and grouting pressure.Optimizing the engineering-controllable variables(grouting pressure and material viscosity)can effectively mitigate the adverse effects of geological-uncontrollable variables(fracture density and fracture aperture)on the diffusion range.Conclusions Based on the observed fracture characteristics in rock layers(e.g.,aperture and density),the grouting pressure and material viscosity should be dynamically adjusted.For cases with narrow fractures where the material is difficult to fully penetrate,increasing grouting pressure enhances material permeability,and selecting low-viscosity grout improves injectability and diffusion in micro-fractures,thereby improving sealing compact-ness,airtightness,and overall effectiveness.
Keywords：response surface methodologydiffusion rangematerial viscositygrouting pressurenumerical simulation
Publication Date：2025-09-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 72-81 )