Study On The In-stiustress Distribution Characteristics At The Shihao Coal Mine, Southern Chongqing

Coal and gas outburst is one of the most serious powerful disaster in China's mines and tunnels,which seriously affects the safe production of coal mine in China.Detection of in-situ stress measurement,therefore,to carry out the construction area,construction area of formation stress state,not only can service all types of rock mass engineering construction,but also,for the earth dynamics research,fault activity and the geological disaster warning provide important scientific basis.As the main large-scale coal production base in Chongqing,the Songzao mining area is currently in the production of six mines,and the mining area is in a complicate geological structure belt.In the history of geological tectonic movement,mine section stress state is complex,the stress state of the mining area so far is not clear,especially the magnitude of principal stress and the maximum principal stress direction there is not clear,which bring great difficulty in mine production.Tectonic belt in-situ stress distribution law in order to grasp the codium mining area,which will provide a scientific basis for safe mining of coal,stone trenches in codium mining area coal mine construction area and the structure section of in-situ stress measurement,preliminary the stress characteristics of the rock in the mine,and mine tectonic zone in-situ stress distribution rule is analyzed,at the same time use of the inversion of the coal seam of coal seam stress.Regional geological mechanics analysis shows that the codium within the mining area is located in the Yangtze paraplatform Yang Zitai fold belt with Sichuan depression on the part of the two secondary tectonic unit,the Yanshan movement against Yang Zitai fold has a strong influence on the west and Himalayan movement on the early tectonic movement make Yang Zitai fold fold and fault deformation.The measurement results show that the azimuth Angle of the maximum principal stress in the north of the mine is 143 ~175,which is basically consistent with the main stress axis in the large area,and the tectonic force is mainly horizontal force.The results of regional geological mechanics analysis can be verified by field stress measurement.