Mining-induced mechanical behavior in coal seams under different mining layouts
Abstract：By summing up a property of the abutment pressure at long-wall coal face under three typical mining layouts,i.e.,top-coal caving,non-pillar mining and protected coal seam mining,some general mining-induced mechanical characteristics such as magnitude and location of peak stress of abutment pressure were proposed.Furthermore,a stress state of coal in the front of mining face was suggested to determine the loading and unloading parameters for a laboratory study subjected to different mining layouts.The vertical stress（i.e.,an abutment pressure） and the horizontal stress of coal in the front of long-wall mining face were simulated by increasing the axial stress and decreasing the confining pressure simultaneously in a conventional triaxial compression test.As a result,a mining-induced mechanical behavior such as stress-strain curves and peak stresses as well as the differences of vertical stress,horizontal stress and deformation of coal samples among three typical mining layouts are obtained.Additionally,a relation between the mining-induce mechanical behavior of coal in the front of coal mining face and typical mining layouts is suggested.
Keywords：mining layoutmining-induced mechanicstop-coal cavingnon-pillar miningprotected coal seam mining
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)