Subsidence prediction of overburden strata and ground surface in shallow coal seam mining

Abstract Shallow coal seam with thick soil layer is widely reserved in the Jurassic Coalfield, Western China, mining-induced subsidence represents complex characteristics. Combining physical simulation, theoretical analysis and in-situ observation, overburden strata structure dip direction were revealed, prediction models established, based on this, equations of ground surface proposed. The results show that after shallow mining, movement characteristics, can be divided into three zones, which are "boundary pillar F-shape zone" (BPZ), "trapezoid goaf (TGZ) "coal inverted trapezoidal (CPZ). depends key stratum, while bedrock basin, between layer. mainly related to mining height bulking coefficient TGZ, it affected by distribution load stratum BPZ CPZ. According simulation model, maximum No.1-2 Ningtiaota mine 1.1 m 1.07 respectively, basically consistence result observation (1.2 m).