Abstract
Distribution characteristics analysis of pressure-arch in horizontal stratified rocks under coal mining conditions
Highlights
The pressure-arch of the mine opening is the result of the redistribution of stress, which both promotes the stability and reflects the strength of the surrounding rock [1 ÷ 4]
Compared to the surrounding rock without a weak inter-layer, the new forming pressure-arch in the stratified rock appears indented at the primary structural planes
The weak inter-layers influence the pressure-arch when the pressure-arch is above the weak inter-layers, and these effects would reduce as the distance between the weak inter-layers and the coal seam increase
Summary
The pressure-arch of the mine opening is the result of the redistribution of stress, which both promotes the stability and reflects the strength of the surrounding rock [1 ÷ 4]. The physical and mechanical characteristics of the stratified rocks are transverse isotropic and orthogonal anisotropic materials largely due to the weak inter-layers [5 ÷ 7] These structural planes will affect the shape and the extent of the pressure-arch and the stability of the surrounding rock. Li et al researched the effects of thin coal seam on the roof of roadways with different thicknesses and positions They found the deformation and failure mechanism of the surrounding rock to the corresponding supporting measures of the roadway [16]. These studies have reached some important conclusions regarding the instability mechanisms of the stratified rocks. It is of significance to study the pressure-arch distribution characteristics in the horizontal stratified rocks for coal mining and tunnels supporting
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