LIU X, ZHANG Y H, XUAN D Q,et al.Analysis of factors influencing the control range of grouting and hole sealing with gel-like materials in fractured rock masses[J].Journal of Henan Polytechnic University(Natural Science) ,2025,44(5):72-81.

DOI:10.16186/j.cnki.1673-9787.2023070018

Received: 2023/07/10

Revised: 2023/11/08

Published:2025/07/23

Analysis of factors influencing the control range of grouting and hole sealing with gel-like materials in fractured rock masses

Liu Xiao1, Zhang Yuheng1, Xuan Dequan2, Xie Jiawei1, Lin Haixiao3, Xu Sen4

1.School of Energy Science and Engineering， Henan Polytechnic University， Jiaozuo  454000， Henan， China；2.School of Safety Science and Emergency Management， Wuhan University of Technology， Wuhan  430070， Hubei， China；3.School of Civil Engineering， Henan Polytechnic University， Jiaozuo  454000， Henan， China；4.Shaanxi Changwu Tingnan Coal Industry Co.， Ltd.， Xianyang  713602， Shaanxi， China

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 viscosity， and fracture aperture on the effective diffusion range of the sealing material. Results The significance ranking of influencing factors on the effective injection range is as follows： fracture aperture， material 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 compactness， airtightness， and overall effectiveness.

Key words:response surface methodology;diffusion range;material viscosity;grouting pressure;numerical simulation