Study on seam inclination variation affected to ground surface movement law in base rock exposed mountain area

in orer to analyze the seam inclination variation affected to the ground surface movement law in a base rock exposed mountain area,according to the geologygeomorphogy and mining condion of a coal mining face in Shitna Mine of Chonging Songzao Mlning Area as a model,the Auto CAD and suter Software were appied to esablish the terain model of the mountain area and a FLAC3 Dwas applied toestabish a numerical mod el of the difrent inelined seam mining in the base rock exposed mounain area. The analysis on the sinulation results showed that frty at the edge area of the goa ,the ground surface suosidence value and horzental movement were highl afcted by the ground suriace sliding in the mounain area and the higher gradient of the surace sope,the igher influences oud b.rt thmountain peak nd the valley areas,the ground surace subsidence vaiation would be smooth.Secondly. he ground surace subsidence and the horzonal movement atures above the inclined seam mining and horizontalseam mining in thesike direcion woud be the same to the law.Final ysith the inc ination of the mining seam increased,he max subsidence value ofthe ground surace would be decreased and the ground surace horizontal movement value at the ise drecion woud be increased.Aong th symneryof the coal mining face cener,the subsid ence value ofthe overburden strata above the goaf and the ground suriace subsidence value would be not more obvious and the max subsidence value of each overburden strata would be offset to the dip direction.