Strong mine pressure behavior and stress regulation of deep large mining height working face in Hongqinghe Coal Mine
In response to the problem of strong overburden pressure caused by the movement of overlying rock layers during deep and high mining,this study focuses on the conveyor belt roadway in the 3-1401 working face of Hongqinghe Coal Mine.Theoretical analysis and on-site measurement methods are used to study the characteristics of strong mining pressure and stress control techniques.The conclusion is as follows:In the deep thick and hard roof working face,there is a strong mining pressure manifestation caused by the overload of the support,which leads to the opening of the safety valve and the large deformation and damage of the roadway.The working face can be divided into a zone of rapid stress increase,a zone of stress drop,and a zone of slow stress decrease.The range of influence of the support pressure is 55 meters,and the stress concentration coefficient is 1.62;The areas of rapid stress increase and stress drop are the key areas for control.The mechanism and technical measures of hydraulic fracturing top cutting pressure regulation have been proposed,and on-site application has achieved good control effects on surrounding rock.
deep miningStrong mine pressure appearanceSupporting pressureHydraulic fracturingStress regulation
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