Macro and micro grouting process and the influence mechanism of cracks in soft coal seam
Hui Yu1
Housheng Jia2
Shaowei Liu2
Zhihe Liu3
Baoyu Li3
1.School of Resources and Environmental Engineering,Shandong University of Technology,Zibo 255000,Shandong,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China2.School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China3.School of Resources and Environmental Engineering,Shandong University of Technology,Zibo 255000,Shandong,China
摘要：Grouting is an important method to reinforce soft coal roadway,and the presence of primary cracks in the coal body has an important influence on the grouting effect.With the discrete element simulation method,the grouting process of the soft coal seam was simulated.The mechanism of primary cracks on grouting was revealed,while the influence of fracture characteristics and grouting pressure on the grouting effect was analyzed.The results demonstrated that grouting in the soft coal seam involves the stages of seepage,rapid splitting,slow splitting,and stability.Due to the presence of primary cracks,the grouting diffusion radius increased significantly.Under the slurry pressure,the tensile stress concentration was formed at the crack tip,and the slurry split the coal once the splitting pressure was reached.In addition,the distribution characteristics of fractures are found to have a great influence on the grouting effect.It is observed that smaller fracture spacing is associated with a larger slurry diffusion radius and thus easier penetration of the primary crack tips.The fracture angle affects the direction of fracture propagation.The secondary fracture formed by splitting is a tensile fracture,which is more likely to extend along the direction parallel to the maximum principal stress.Overall,these simulation results have guiding significance for the setting of reasonable spacing of grouting holes in the practice of grouting engineering.
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论文发表日期：2021-10-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：14( 969-982 )
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