LIANG X Y, FANG G, WU Y Q, et al. Investigation of the fissure propagation mechanism of fracture grouting in the Balasu Coal Mine [J]. Journal of Henan Polytechnic University (Natural Science) , 2025, 44(4): 104-111.

doi: 10.16186/j.cnki.1673-9787.2024010021

Received: 2024/01/17

Revised: 2024/09/18

Published: 2025/06/19

Investigation of the fissure propagation mechanism of fracture grouting in the Balasu Coal Mine

Liang Xiangyang1, Fang Gang1,2, Wu Yiqiang1, Wang Fuyu3, Liu Yang1,4, Zhang Jiafan5

1.Xi’an Research Institute （Group） Co.， Ltd.， China Coal Technology and Engineering Group Corporation， Xi’an  710054， Shaanxi， China；2.Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard， Xi’an  710077， Shaanxi， China；3.College of Architecture and Civil Engineering， Xi’an University of Science and Technology， Xi’an  710054， Shaanxi， China；4.School of Geology and Environment， Xi’an University of Science and Technology， Xi’an  710054， Shaanxi， China；5.College of Sciences， Xi’an University of Science and Technology， Xi’an  710054， Shaanxi， China

Abstract: Objectives Grouting modification is an effective technique for preventing and controlling water-related disasters in coal mines. This study investigates the fracture grouting effects on coal under high-pressure， water-rich conditions， which is of great practical significance for engineering applications.  Methods Based on a fluid-solid coupling mechanism in discrete element modeling， the concepts of “domain” and “pipeline” are introduced to simulate the coupling process during fracture grouting. The fluid “domain，” considered as a water reservoir， consists of triangular regions formed by connecting particle centers. The “pipeline” represents fluid migration paths connecting these domains， modeled using smooth parallel plate structures. The meso-parameters of the numerical model are calibrated using uniaxial compression and Brazilian splitting tests. A numerical model of fracture grouting is established to simulate force chain distributions after coal fracturing and to analyze the influence of grouting pressure and lateral pressure coefficients on fissure propagation.  Results The results show that without confining pressure， the contact force between particles around the borehole ranges from 0.02 to 0.10 MPa， while under confining pressure， it ranges from 0.06 to 0.12 MPa. Under equal confining pressure， higher confining pressure leads to wider stress concentration zones but shorter fracture propagation distances. At the same confining pressure， increasing grouting pressure extends the fracture propagation range. Under unequal confining pressure， fractures tend to develop parallel to the direction of the maximum principal stress. Conclusions Higher grouting pressure can effectively displace water and air from coal seam fissures， reduce the number of boreholes required， and lower operational costs. The results provide valuable guidance for the selection of grouting parameters and offer technical support for similar engineering applications. 

Key words: coal-rock fracturing; grouting reinforcement; fluid-solid coupling; numerical simulation; propagation mechanism