A Mathematical And Experimental Study Of
Rock Bump Mechanics
Author(s)
J. Vacek & S. Sedláčková
Abstract
This paper deals with the behaviour of open rock that occurs, for example,
during longwall mining in coal mines, in deep tunnel, or shaft excavation.
Longwall instability leads to extrusion of rock mass into an open space. This
effect is mostly referred to as a bump, or a rock burst. For bumps to occur, the
rock has to possess certain particular rock burst properties leading to
accumulation of energy and the potential to release this energy. Such materials
may be brittle, or the bumps may arise at the interfacial zones of two parts of the
rock, that have principally different material properties. The solution is based on
experimental and mathematical modelling. These two methods have to allow the
problem to be studied on the basis of three presumptions:
The solution must be time dependent.
The solution must allow the creation of crack in the rock mass.
The solution must allow an extrusion of rock into an open space (bump effect).
Keywords: rock burst, bump, mining, rock mechanics, mathematics and physical
modelling.
1 Introduction
Bump is the most dangerous event, that can occur during excavation works.
During bump is into underground open space with severe force extrude
surrounding rock. This can hurts or kills mining workers and destroys excavation
space. Therefore is study of this problem very important for theory and praxis.
For bump occurrence is necessary sufficient high pressure in bump place
(usually great depth, but also tectonic pressure) and rock must be brittle and must
have disposition for bump (properties, that allow creation of bumps).
Keywords
rock burst, bump, mining, rock mechanics, mathematics and physical
modelling.
Related Book
Other papers in this volume
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