Research on roadway supporting effect of different bolt parameters under blasting dynamic load

摘要

According to the roadway characteristics and physical properties of rock, calculation model of FLAC2D established,analyzes strain and stress distribution of roadway surrounding rock under static condition and dynamic load of blasting.The results show that, by blasting dynamic loads, stress of surrounding rock will be redistribute, cause displacement increased,and vertical displacement larger than lateral displacement;with the decrease of rock bolt spacing, stress and displacement of surrounding rock under blasting dynamic load decreases, and when the distance is less than a certain value, the influence of blasting dynamic load is smaller.Combined with the results of numerical analysis, gained reasonable supporting parameters,and applied to the engineering practice, has obtained good supporting effect.