Abstract
On August 2, 2019, a catastrophic rockburst disaster occurred in Tangshan mine, causing death of 7 miners. After the investigation, the coal mine is facing reproduction. Taking the 0291 panel as the engineering background, this paper studies the coal seam blasting pressure relief and ground stress monitoring technology in working face retreat. During the roadway development and working face excavation, coal seam blasting was adopted to transfer the high ground stress of coal seam to the deep ground of the coal body. The blasting operation is presented in detail in this paper. In the working face retreat stage, drilling powder method, hydraulic shield resistance monitoring, roof displacement, and vibration monitoring methods are implemented. The results show that the pressure relief range of coal seam is 4–12 m in the coal mass after blasting. The shield working resistance is stable at 20–30 MPa. The range of relative displacement of the roof is about −1.0 to 2.5 mm, and the maximum vertical vibration velocity is in the range of 7–11 cm/s, up to 12 cm/s. The measured parameters are acceptable, so it is concluded that 0291 panel can be safely mined. This study provides a reference for the coal seam blasting design for rockburst coal mine and provides a technical means for the analysis of pressure release effect and dynamic pressure monitoring during working face retreating.
Highlights
Rockburst is a dynamic phenomenon of violent destruction of coal and rock mass in roadway or working face in the process of coal mining, which is often accompanied by coal and rock mass throwing, loud noise, and air wave
Blasting design and operation are presented in detail. e technics to evaluate the pressure relief effect after blasting are manipulated. is paper provides a case study on the coal seam blasting design, operation, and pressure relief effect monitoring technology of high rockburst proneness coal mine, which provides a reference for similar engineering projects
(2) During working face retreat, the working resistance of the hydraulic shield is stable at 20–30 MPa. e result of roof movement monitoring shows that the relative displacement of the roof is about −1.0 to 2.5 mm. e overall displacement is small and shows a characteristic of vibration
Summary
Rockburst is a dynamic phenomenon of violent destruction of coal and rock mass in roadway or working face in the process of coal mining, which is often accompanied by coal and rock mass throwing, loud noise, and air wave. Coal seam blasting can effectively release the elastic deformation energy accumulated in coal and rock mass, change the structure of the surrounding rock, and reduce the stress concentration, so it can be used to prevent rockburst disaster. Qi et al [7,8,9] put forward the stress control theory, which believes that seam blasting causes stress redistribution of coal and rock mass It can effectively reduce the ground stress level and move the peak stress far away from the rib to reduce impact risk. E field test of blasting conducted by Sun [16,17,18] in Gushan coal mine shows that the prevention of rockburst by blasting is a process of modification-stress reduction-energy dissipation It leads to surrounding rock support deterioration, structural instability, and roadway large deformation. Blasting design and operation are presented in detail. e technics to evaluate the pressure relief effect after blasting are manipulated. is paper provides a case study on the coal seam blasting design, operation, and pressure relief effect monitoring technology of high rockburst proneness coal mine, which provides a reference for similar engineering projects
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