Model Test and Numerical Simulation of the Overburden Movement and Deformation Due to Strip Mining Below Thin Bedrocks

摘要

The rules of the overburden strata and ground movement and deformation, and the parameters of the ground movement induced by strip mining below thin bedrocks are unique. According to the thin bedrocks strata in Taiping Coal Mining Area of Yanzhou, this paper, applying comprehensive research method combining engineering geological mechanical model test and finite element numerical simulation, studied the engineering geological mechanism on the overlying strata and ground movement and deformation induced by strip mining below thin bedrocks, revealed the strata displacement or deformation rules. On the condition of ensuring the width left as 40m, to the coal seam of 188m buried depth (among them bedrock only 34m thick), 8.8m minig height, the disign of 30～40m mining width is reasonable, meanwhile, the extraction ratio added to 42.86%～50%. The ground subsidence can be controlled effetely as long as the design of the mined-out strip to pillar width ratio is reasonable.