Study On Stability And Mechanical Properties Of Deep-Seated Coal

When coal mining from the shallow to deep extension of the deep bound to face high temperature, high pressure, high pressure and high gas pressure and a series of mining issues. As the organic components of coal-based special sedimentary layer, the confining pressure, temperature change, must show different characteristics and shallow. This paper studies the stability of coal seam thickness, coal structure and development conditions and mechanical properties of coal in the deep and shallow differences.Paper on the main characteristics of coal seam occurrence of No.13-1 coal seam, analysis of coal seam thickness, seam thickness variation coefficient of statistics; Borehole logging contractors know the situation and development of coal structure and to investigate its distribution, analysis of tectonic coal type, location and thickness of growth; Testing of coal and roof and floor of coal mechanical properties of variation, discussion changes in mechanical properties and structural stability of coal seam thickness and development.After systematic analysis made the following points summarize the main knowledge:1) Through the analysis of thickness stability of No.13-1 coal seam and depth, found with depth deepening the stability of stabilized coal thickness; Deformation mechanism based on analysis of the coal bed, deep differences in mechanical properties of coal bed changes, tectonic deformation in deep strata of the coal seam is smaller than the shallow, so deep coal deposits closer to the native form;2) Mine are more full development of tectonic coal development of the total thickness of coal, coal accounted for more than 30% of the drilling of 100, accounting for 70% of all drilling; Development of multi-layered structure of coal, mostly 1,2 layer; And the tectonic coal developed in the coal seam at the top and bottom;3) Through the consistent coefficient of coal testing, compressive strength of 8.6MPa at-480m elevation, in-850m elevation 4.6Mpa, linear correlation curve is-0.0099; The compressive strength of roof and floor rock slope changes with depth-0.0424; and shallow compared to the mechanical properties of deep coal is closer to the roof and floor strata; Figure [31] Table [13] Reference [85]...