Mechanical analysis for X-O type fracture morphology of stope roof
Abstract：The fracturing morphology of stope roof is closely related to the weight of stope,gas drainage,groundwater migration,surface subsidence and so on.A mechanical model of elastic plate for the four edge clamped roof was established and the fracture mechanism of the roof was analyzed using Ritz method.The laws of the breakage and breaking elongation and transfer of stope roof were obtained.Based on the maximum tensile stress criterion of materials,a three-dimensional numerical simulation for the space breaking morphology of roof was carried out using the life and death element technology in the finite element software ANSYS.The results show that the destruction of the roof along the length and short side is in line with theoretical analysis.The failure law along thickness direction of roof was obtained and a space ＂O＂ shape crack was formed.The destruction strips layer upon layer under the center of roof bottom.The specific location of cracks branching was identified and a space ＂X＂ crack morphology was formed.Finally the space ＂X-O＂ type fracture morphology was obtained.
Keywords：stope rooffracture morphologycracks branchingspace ＂X-O＂ type crack
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)