Prevention and control technology of rock burst in deep stope with complex solid boundary

PAN Li-you; NIU Yan-kai; KOU Tian-si

doi:10.11779/CJGE202206017

Volume 44 Issue 6

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Chinese Journal of Geotechnical Engineering > 2022 > 44(6): 1124-1132. > DOI: 10.11779/CJGE202206017

PAN Li-you, NIU Yan-kai, KOU Tian-si. Prevention and control technology of rock burst in deep stope with complex solid boundary[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(6): 1124-1132. DOI: 10.11779/CJGE202206017

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Prevention and control technology of rock burst in deep stope with complex solid boundary

Mining Engineering Research Institute, Shandong University of Science and Technology, Taian 271000, China

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Received Date: May 10, 2021
Available Online: September 22, 2022

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Abstract

Abstract

Rock burst is easy to occur in deep stope with complex soild boundary during excavation. If the irregular coal pillar with a larger width is left in the stope, the risk of rock burst in the stope will be stronger. Taking the working face No. 4137 of Zhaogezhuang coal mine with coal pillars with an unequal width at lateral side and a solid and irregular upper side of return air chute mining boundary as the research background, a mechanical model for the roof structures of the stope is established, and the causes for rock burst are analyzed. Based on the researches on the dissipative mechanism of dissipative structure body, according to the occurrence conditions of coal seam in the working face No. 4137, the prevention and control technology of rock burst dominated by L-and I-type dissipative structures is proposed. Through the implementation of L type dissipative structure in the area of coal pillars with an unequal width, the lateral concentrated high stress distribution of coal and rock mass in mining roadway is adjusted, and the energy dissipation mode of coal seam is changed. Through the implementation of I-type weak structure body in the working face, a dynamic moving dissipative structure energy release body is produced in the leading area of the stope. The dissipative structure body expands the range of stress field, reduces the stress concentration degree, and changes the accumulation mode of coal impact energy. The water injection in coal seam weakens the coal body and strengthens the anti-scour function of dissipative structures. The prevention and control technology is tested in the working face No. 4137, and the rock burst is effectively controlled.
- coal pillar with an unequal width,
- solid boundary,
- dissipative structure,
- rock burst,
- prevention and control

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