Study On Reasonable Parameter Of Large DIP Angle Of Fully Mechanized Coal Face Section Coal Pillar

This text regards E1151 working face of CuiJiaZhai coal mine as the research object. Adopt BA —II type enclose tester survey the entry becomes flexible and encloses the development law in the pit to become flexible; Adopt coal hole get into bits method determine the distribute law of side direction support pressure that working face caused by extraction; Use calculate simulation software 2D —σ that Japan research and develop carry on the numerical simulation to coal column reasonable width all scheme; Using the plasticity theory and analyze the elastic district width and stability in the coal pillar. Studies have shown: Depth of burying of the coal seam and the rock stratum structure and nature of roof This is one of the main factor that influence both sides limit balance district width of coal pillar, elastic district coal bearing capacity namely whole coal pillar critical of size. Under the complicated stress state. The elastic coal pillar district and plasticity pillar district undertake the pressure of moving together. The reasonable coal pillar set up width is the sum of both sides limit balance district width and centre elastic district critical size , The peak supports pressure value of the working face lies about 3m in front of it. The destroy range of coal body roughly between 1. 1 and 1. 5 meters. The range of plasticity district of upper and lower sides of coal column shows a tendency to reduce after the coal seam inclination increases, This is particularly obvious after the inclination is greater than 20 degree; Its dependability runs up when the coal column is greater than 6 meters; Combine through analyze and theoryactual conditions get to the coal column rationally set size is 8m finally.