Study On Overlying Strata Movement Rule Of Roof Coal Mine In Xiao Jihan

Analysis of overlying strata movement rule of roof, Traditional approaches for "three band" research and calculations are based on empirical formula method, similarity method. Stratums considering very few, so in the process of with site would have a significant margin. Reclassified on the basis of previous research, this article on roof strata, on the roof, "three band" theory of overlying strata are divided into "four band" and combined with the characteristics of each zone is calculated for each of the level and analysis of the mechanism of movement and deformation of the strata. Using "four band" characteristics of Xiao Jihan coal mining surface subsidence regularity. Its main elements are as follows:1) Using the theory of composite laminated plate rock strata bent oval track is proposed equations, taking rock subgrade and rock lithology of overlying rock strata was calculated bending deflection curve equations. Combination of deflection equation, the rock strata is given basic conditions and discriminating method for delimitation and fissures.2) Combined with Xiao Jihan coal mine of practical engineering background, analysis of Xiao Jihan and characteristics of overlying strata movement rule of roof coal mine mechanical mechanism. Combined with "three band" theory Xiao Jihan coal mine roof overburden reclassified as "four" and combined with Xiao Jihan coal mine geological settings determine all the zone’s height, precisely the roof thickness of cesspits.3) Based on UDEC numerical simulation software for Xiao Jihan coal layers with different thickness and crack growth law, using simulation software for roof strata in working face in the process of abscission layer and the height and location of the fissure.4) Method for measuring the small oblique hole injection Jihan coal mine roof fracture height, leakage and dynamic injection compared with the original rock-filled fluid leakage. Combined with the comparison more accurate to see Xiao Jihan coal mine roof abscission layer and fractured pattern and height. Combined with previous theoretical study on calculation field can actually see the difference between theory and practice is very small.