Study on seepage path of confined water in coal seam floor structure with collapsed columns
Dong Xufeng
Abstract：In order to determine the water inrush conditions and key prevention areas of the floor with collapsed columns in the struc-ture,from the perspective of mining influence,collapsed column structure,and the combined effect of confined water pressure,and based on the theory of fracture mechanics,the initiation conditions of seepage cracks and the judgment basis for anti-seepage strength were de-rived,and the principle of the concentrated load and the uniform strip load propagation of elastic half space was applied.An expression of the vertical stress,the horizontal stress and the shear stress of the floor of a structured coal seam under the joint action of the mining stress and the confined water was derived.The expansion law curves of floor seepage cracks were obtained by using Matlab.The seepage path of the floor confined water was simulated by using the COMSOL software,the existence of the floor collapsed column structure af-fected the expansion direction of the floor seepage path,and the seepage path was expanded by the"inverted octave"type mainly along the top of the collapsed columns,and the crack expanded to the floor 27 m,and the crack was penetrated,the seepage paths were formed.
Keywords：stress expressionCOMSOLcrack propagationseepage pathcollapsed column
Publication Date：2025-02-27
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 105-109 )