Failure Mechanism of Coal Seam Floor and Calculation of Maximum Breaks Depth
ZHANG Fengda
SHEN Baohong
KANG Yonghua
Abstract：To further understand the failure mechanism of coal seam floor, the stress and location of the critical failure of the coal seam floor were determined by using the semi-infinite body theory. Based on this, the formula of maximum breakage depth of coal seam floor was derived by using the slip line field theory of the plastic mechanics, the relationship between the maximum breakage depth of the coal seam floor and its affecting factors was analyzed, and the rationality of the calculation formula was illustrated by the examples. The results showed that the maximum breakage depth of the coal seam floor increased with the increase of the internal friction angle of the floor rock and decreased with the increase of the cohesion of the floor rock in a fixed scope of the plastic zone of coal wall. The maximum breakage depth of coal seam floor was not only related to the scope of the plastic zone of the coal body at the end of the stope, but also increased with the increase of the peak value of the leading support pressure.
Keywords：semi-infinite body theoryslip line field theoryMohr-Coulomb criterionfloor failure
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 58-61 )