Drilling into joint and top-cutting pressure relief technology for a coal mine
As a widely recognized and effective roadway support method,the top-cutting pressure relief technology,plays a positive role in improving the stress distribution inside the roadway and reducing the deformation of surrounding rock.To address the stress issues faced by the 1123 transportation roadway in Xichuan Coal Mine and reduce the deformation of surrounding rock,a drilling into joint and top-cutting pressure relief technology has been proposed.This technology can drill deeply into high-pressure zones,has a good pressure relief effect,and is flexible reliable,which is suitable for harder rocks in coal seams,and has high reliability and practicality.Through precise calculations using the stress function method,the upper and lower thresholds suitable for the drilling of the coal mine were determined,which are 14.14 and 6.32,respectively.The collapse state of the roof under different hole spacing was analyzed in depth using the numerical simulation method,and the stress distribution properties of solid coal before and after roof cutting were studied.The results show that the top cutting and pressure relief technology significantly improves the roof caving performance and can effectively prevent the occurrence of rockburst.At the same time,this technology can effectively reduce the stress transfer ratio,reducing the peak stress values in solid coal by 25.44％and pushing the peak point inward by 179.18％.The research results can providea reference for the selection of small coal pillar retention and support methods in the future.
coal minedrilling into jointtop-cutting pressure reliefstress function methodstress distributionnumerical simulation
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