Breakage and falling of a high coal wall in a thick mined seam
Abstract：Field measurements and simulations of the evolution and appearance of mining in- duced fracture are used to explain the development of rip falls. The mechanics behind these falls is discussed. Results show that a coal seam with bedding only has a mining induced frac- ture plane consisting of two conjugate planes with an inverse incline. Jointed coal seams have a fracture plane consisting of a sheared crack plane and an open plane in the joints. These have an inverse incline in hard coal, relative to the goaf, but one set shear plane inclining to the goaf in soft coal. Slip-line theory can identify the danger zone by the coal wall. The main factor that induces instability in the wall is the unsupported roof length of the tip-face and the pressure on the voussoir beam.
Keywords：large mining heightrib fallingmining-induced fracturejointed fractureslippingline
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 371-377 )