ESTABLISHMENT AND ANALYSIS OF THE COMPOSITE KEY STRATUM MODEL LAYER ON THE WINKLER FOUNDATION

With the increase of exploitation depth and intensity, composite effect appears in some proximal hard rocks, and the rock press appearance resulted from it poses greater challenges to coal seam safety. Based on the Key Strata Theory, this paper establishes Winkler Model, using composite materials structure mechanical theory. Then, mechanical properties of composite key strata are analyzed and interval of composite key strata is calculated in condition of Winkler Foundation. Besides, the paper also analyzes the width of limit equilibrium zone in condition of composite key strata and discusses the effect of support pressure on permeability, and the findings will lay a theoretical foundation for the establishment of interval on work face in condition of composite key strata and the selection of support type.