| How to analyze the stability of bolting roadway under different earthquake classification is still a key problem to be solved in mining field.This paper attempts to use explosive blasting to simulate the influence of mine earthquake.The ANSYS/LSDYNA software is used to analyze the source grade(energy)and the location of the source to the stability of the bolt supporting coal roadway and the dynamic stress characteristics of the bolt.The main work and results are as follows:(1)In a coal mine as the background,the establishment of blasting numerical model,get around the roadway speed time history vibration curve,and through the fast Fourier transform into the frequency spectrum,then the measured curve and microseismic roadway comparison,proved the feasibility of simulation of mine earthquake effect by blasting.To find out the relationship between the amount of explosives and energy in the literature,and then by adjusting the keyword parameters of the explosives in the simulation,the formula of the relationship between the amount of explosives and the volume of explosives in the simulation is obtained.Finally,the relative relationship between the amount and energy of explosive and the volume of explosive in simulation is summarized.(2)By using the relation between the amount of the explosive and the grade of the mine earthquake,the stress,displacement and vibration velocity of the surrounding rock of coal roadway under different source energy and different source position are simulated and analyzed,The energy boundary value and distance limit value of shock occurrence are obtained.The static stress characteristics of the bolt in coal roadway and the dynamic axial stress and strain of the bolt under different energy mine earthquake are analyzed,Get the most serious position of the stress of the bolt.And the safety factor of bolt under different anchor spacing is analyzed,and the best bolt spacing support scheme is given. |
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