Field Testing and Analysis of Deep Ground Stress in No.1 Coal Mine of Pingdingshan Coal Industry

The deep ground stress tests have been carried out by using hydraulic fracturing method in main transportation roadway of No.1 coal mine of Pingdingshan coal industry.The distribution characteristics of ground stress in mining area are analyzed.Test results show that the ground stress level is high in this mine area,the maximum principal stress controlled by tectonic stress is nearly horizontal,the three principal stresses increases approximately linear with the increase of depth.The results can provide references for deformation mechanism,support theory and construction of roadway.