Dynamic Response Analysis of Roadway Surrounding Rock Induced by Dynamic Load under the Action of Hard and Thick Rock Stratum

In the process of coal seam mining, there are often hard thick key layers in overlying strata. Due to high strength and good integrity layer, after layer is broken, strata will collapse lose stability a large area, which very easy induce dynamic disasters such as rock burst, mine earthquake, wall caving, roof slab caving. Aiming at working face, response under strong earthquake induced by breaking main high-level magmatic numerically simulated analyzed using FLAC2D numerical simulation software, variation laws stress field, displacement velocity field roadway different boundary conditions focal heights studied. The research shows that solid prone vibration small range, increases decreases with disturbance. floor two sides top along goaf continues increase initial stage disturbance, remain stable continuation both gob can reach later number adjacent goaf, longer it takes for surrounding stability. When height lower than 90 m, sharply decrease height. occurs low stratum, impact damage almost inevitable. influence degree on arranged follows: gob-side (mined out one side) > sides) side). evolution also face have an important energy propagation earthquake. With goafs, faster attenuation rate is. results reference significance safe mining similar geological conditions.