Numerical Modeling Of Bumps Using
The Stress Stages
Author(s)
P. P. Prochazka
Abstract
In several of the author’s previous papers the problem of bumps occurrence has
been solved by distinct element methods, namely by free hexagon method. The
latter method proved its significance in description of the most probable
nucleation of cracks, which at the moment of bumps create the contact surface of
the moving part of the coal seam. The movement of particles is also described in
a very good manner. In this paper another approach is used. Starting with the aim
of describing whether the bumps occur or not, or under which condition, the
continuum of both rock seam and the overburden (rock) is considered. The
decision whether the bumps are triggered can then be derived from conditions at
different points of the coal seam. For the solution, finite element method is used
and elastic behavior (more precisely brittle material) of the coal seam and plastic
behavior of the rock are assumed.
Keywords: bumps in deep mines, mechanical behavior of rock, slip conditions.
1 Introduction
Bumps or rock bursts is a phenomenon, which occurs during mining in deep
mines. This phenomenon appears during longwall mining, for example, and
mostly it is qualified as a sudden release of energy concentrated at the side face
of a shaft. This extreme concentration can be caused by material changes in the
overburden rock massif, of distant local disturbances, due to creation of cracks,
emission of gas, human activities in the neighborhood of the site of mining, etc.
In any case, it is necessary not to forget the fact that along the upper part of the
shaft where the ceiling and the rock are in contact, a tip of a crack (notch) causes
a natural accumulation of energy. From classical theories based on elastic
solution such a point is classified as a mass point of singularities and even
Keywords
bumps in deep mines, mechanical behavior of rock, slip conditions.
Related Book
Other papers in this volume
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