Numerical Study of Damage Evolution Law of Coal Mine Roadway by Particle Flow Code (PFC) Model
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Deformation and destruction of roadway surrounding rock is one of the main causes of coal mine accidents. In this paper, the horseshoe-shaped roadway model was established by particle flow code firstly and then analyzed the roadway damage process through the contact force chain, deformation displacement and distribution of micro-cracks. The research result show that the parallel bond model can well simulate the damage process of the coal mine roadway. The surrounding rock can be divided into four zones from the roadway side to the deep rock mass. The micro-contact force chain is the force transmission path and the principal stress is the macroscopic reflection of the micro-contact force chain.
KeywordsRoadway Particle flow code Surrounding rock Damage evolution
The research described in this paper were financially supported by the open fund of Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education (Anhui Universit of Science and Technology) (No. JYBSYS2018205), Liaocheng University Research Fund (No. 318051703), National Natural Science Foundation of China (No. 51774009).
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