Contact Problems In Geomechanics Focused On
Bumps Occurrence
Author(s)
V. Doležel & P. Procházka
Abstract
The phenomenon known as bumps or rock bursts are one of the greatest dangers
to human health during mining operations. They are caused by the accumulation
of energy of forces (stresses) in close vicinity to a face of excavations of seams.
This causes a sudden release of energy, which is strongly dependent on a
development of material properties in both rock overburden and coal. In this case
the coal material behavior can be neglected as for the time development.
Hereditary problems have to be taken into account, as velocity of excavation is
one of the biggest problems in this field of research. The faster the velocity is,
the shorter time for redistribution of forces can be reached. This causes a more
dangerous situation, as for the bumps initiation. These ideas are valid for pure
openings, but not for wall reinforcement during mining, support of the ceiling of
mines, etc. These additional elements also have to be taken into account, but not
in this paper. We are concentrating only on time dependency of redistribution of
stresses in the vicinity of seam face.
Keywords: rock bumps, coupled modeling, certain time-dependent problems,
bumps on dislocations, physical scale modeling, numerical solution.
1 Introduction
In the paper, a time-dependent contact problem is formulated and solved. The
main application is focused on the field of geomechanics, namely on bumps
occurrence in deep mines. The time factor, which plays decisive role in the
solution of the problem of bumps, depends on wide scale of circumstances. One
of the most important items describing the sudden failure of the rock, i.e.
influencing the real behavior of the rock, and consequently leads to the bumps
Keywords
rock bumps, coupled modeling, certain time-dependent problems,
bumps on dislocations, physical scale modeling, numerical solution.
Related Book
Other papers in this volume
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