The Small Kiln Impact Seam Roadway Excavation And Supporting Technology And Parameter Optimization

With the integration of a large area of China’s coal enterprises, small coal mines gradually withdraw from the stage of history. However, due to the problem of small coal mines in the old mining damage left, will be large-scale coal state-owned enterprises in China will face. Old room and pillar mining method to mine the coal leaving a large gob, making very complex geological environment, mainly through field exploration, laboratory tests, simulations and other research tools for small gob area studied. In this paper, combined with the Pan Jia Yao Coal three main roadway for the study, analysis of both sides of the small gob area roadway.I participate in the actual field gob roadway affect mechanical properties of rock samples collected parameters, master Pan caijiayao4#coal seam geological conditions, such as depth, geological structure; collect roadway construction-related parameters such as the length of the roadway, section size and support methods; understanding Face production since roadway deformation and damage, and conduct face rock, coal field sampling, in order to support parameter calculation and provide a basis for numerical simulation analysis.By numerical simulation experiments on small gob roadway near simulation calculations. Different layout scheme under conditions model, and the surrounding rock damage analysis. The results of the vertical displacement, the level of surrounding rock and plastic zone analysis to determine Pan tianjiayao4seam optimal roadway layout program.On numerical simulation goaf affect the the optimal roadway layout program in the region and in the the optimal support program based on analysis of surrounding rock classification, through the specification of the empirical and semi-empirical formula, in order to determine the surrounding rock difficult to support, and to determine the support program. Focuses on the calculation of the parameters loose circle in the surrounding rock classification and support, combined with contrast simulation results, the engineering experience formula to calculate the results of the Hawke Brown derivation formula calculation results, and ultimately meet the premise of roadway safety, in order to determine the loose ring size to meet the requirements. In addition, according to the taxonomic status of the surrounding rock, using the formula to calculate the Roadway (anchor) support parameters, including the length of the diameter of the bolt, bolt, bolt between row spacing.Then, by numerical simulation experiments to optimize the parameters roadway, a three-dimensional model, through a fixed factor approach, that is parsed in a different bolt diameter, bolt length, bolt spacing between rows of circumstances supporting simulation, analysis under different circumstances surrounding rock control effect, and ultimately determine Pan tianjiayao4#Coal three roadway reasonable economic support programs and support parameters.