Energy Transfer Characteristics In Large Inclined Angle Coal Seam And Stability Control Of Adjacent Roadway

During the mining process of coal face with large dip angle,the deformation and stress characteristics of surrounding rock have asymmetry.In the excavation of the working face,a large range of energy transfer is accompanied in the surrounding rock,and the surrounding rock stress field also changes accordingly.Large dip angle coal seam is different from general horizontal coal seam.Due to the large dip angle of the coal seam,the energy is re-accumulated during the mining process,and the accumulated energy further affects the stability of the adjacent roadway.In this thesis,the large dip angle coal seam and its adjacent dynamic pressure roadway were taken as research objects,combined with the production geological conditions of the west wing track of Chenmanzhuang Coal Mine,comprehensive application of indoor mechanical tests,theoretical analysis,numerical simulation and field test.The energy transfer characteristics of the 3# coal seam 3206 and 3402 working face in Chenmanzhuang Coal Mine and the deformation law of the west wing track and alley under the influence of mining were studied.The distribution of surrounding rock stress field and energy field in dynamic pressure roadway was analyzed.The thesis proposed the energy-based dynamic pressure roadway stability control technology.The main research conclusions are as follows:(1)Based on the stress-strain curve of uniaxial compression,thesis studied the energy dissipation and release during rock compression test,and the energy change during uniaxial compression is analyzed.The variation laws of total energy,elastic deformation energy and plastic deformation energy during rock uniaxial compression were obtained.The results show that the elastic deformation energy increases linearly before the peak and decreases rapidly after the peak,while the plastic dissipation energy changes little before the peak and increases significantly after the peak.(2)The thesis analyzed energy transfer characteristics of coal face with large dip angle under different factors of dip angle and different adjacent distance.Compared with the energy distribution of the working face under different dip angles,the thesis studied energy transfer characteristics of surrounding rock in the working face of the large dip angle coal seam and the influence of the working face of the large dip angle coal seam on the adjacent roadway.The energy distribution characteristics of the mining face affected by the working face at different distances were obtained.When the vertical distance between the roadway and the working face is greater than 40 m,the limit distance of the working face to the roadway was reached.(3)The numerical simulation method is used to analyze the surrounding rock stress field and energy field distribution under the influence of mining,and the influence of the leading bearing pressure generated by the 3206 working face on the surrounding rock deformation of the roadway was studied.The influence of lateral support pressure of 3402 working face on the west wing track and alley during secondary mining was analyzed.The research results show that the mining of the 3402 working face causes a large-scale transfer of energy throughout the rock formation,and the roadway is greatly affected by energy transfer,and the deformation of the surrounding rock of the roadway increases.(4)The theoretical analysis method was used to study the energy distribution law and influencing factors of surrounding rock in dynamic pressure roadway.Based on the expression of strain energy distribution of surrounding rock in mining roadway,the relationship between energy distribution state of surrounding rock and support force was obtained.Do some research on the influence of different surrounding rock mechanical parameters on plastic dissipative energy.The distribution of surrounding rock energy in arched roadway under different influence parameters was analyzed by numerical simulation: with the increase of internal friction angle and cohesion of rock,roadway The plastic dissipation energy of the surrounding rock was gradually reduced.(5)The technical parameters of surrounding rock control of dynamic pressure roadway are determined.The roof of the roadway and the two gangs were supported by anchor bolts.At the same time,grouting reinforcement was adopted to improve the bearing performance and mechanical parameters of the surrounding rock of the roadway,and to inhibit the crack propagation inside the surrounding rock of the roadway to achieve control.The effect of surrounding rock deformation in the roadway.Industrial tests show that the research results effectively guide the surrounding rock control of the west wing track of Chenmanzhuang Coal Mine,which provides a powerful condition for mine safety production.