Abstract
In coal mines, underground roadways are required to transport coal and personnel. Such tunnels can become unstable and hazardous. This study simulates deformation and damage in the rock surrounding a shallow coal seam roadway using particle flow code. A numerical model of particle flow in the surrounding rock was constructed based on field survey and drilling data. Microcharacteristic indices, including stress, displacement, and microcrack fields, were used to study deformation and damage characteristics and mechanisms in the surrounding rocks. The results show that the stress within the rock changed gradually from a vertical stress to a circumferential stress pattern. Stress release led to self-stabilizing diamond-shaped and X-shaped tensile stress distribution patterns after the excavation of the roadway. Cracking increased and eventually formed cut-through cracks as the concentrated stress transferred to greater depths at the sides, forming shear and triangular-shaped failure regions. Overall, the roof and floor were relatively stable, whereas the sidewalls gradually failed. These results provide a reference for the control of rock surrounding roadways in coal mines.
Highlights
Increasing population growth and socioeconomic development have led to increases in the extent and depth of coal mining [1]. is has led to an increase in engineering safety problems such as mineshaft roof instability, roof and floor water inrush, gas outbursts, and deformation of the rocks surrounding roadways [2,3,4,5,6,7,8]. ese problems influence the safety, environmental impacts, and efficiency of coal extraction. e stability of rocks surrounding underground coal roadways and associated stability control technology has become the focus of mining production and safety research [9,10,11]
Coal roadways are the main passages used for underground transportation; their stability affects the ease and safety of coal and personnel transport
As coal roadways are excavated, their roof, bottom plate, and sides can become deformed and damaged due to excavationmediated unloading, which affects the safety of the mineshaft. erefore, it is necessary to study deformation/damage mechanisms and characteristics in the rock surrounding coal roadways after excavation
Summary
Increasing population growth and socioeconomic development have led to increases in the extent and depth of coal mining [1]. is has led to an increase in engineering safety problems such as mineshaft roof instability, roof and floor water inrush, gas outbursts, and deformation of the rocks surrounding roadways [2,3,4,5,6,7,8]. ese problems influence the safety, environmental impacts, and efficiency of coal extraction. e stability of rocks surrounding underground coal roadways and associated stability control technology has become the focus of mining production and safety research [9,10,11]. Is has led to an increase in engineering safety problems such as mineshaft roof instability, roof and floor water inrush, gas outbursts, and deformation of the rocks surrounding roadways [2,3,4,5,6,7,8]. E stability of rocks surrounding underground coal roadways and associated stability control technology has become the focus of mining production and safety research [9,10,11]. Erefore, it is necessary to study deformation/damage mechanisms and characteristics in the rock surrounding coal roadways after excavation. Many studies have examined the characteristics and control of rock surrounding coal mine roadways. Li et al [17] used a large-scale geomechanical model to investigate the deformation and displacement characteristics and the stress evolution of rock surrounding a deep roadway within the Zhaolou Coal Mine, Juye Mining Area, China. A hydraulic model of roadway-surrounding rock for different areas was established. e
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
