Characterization Of Dislocation In
Underground Mass Using Coupled Modeling
Author(s)
V. Doležel & P. Procházka
Abstract
This paper deals with an application of coupled modeling in the identification of
dislocation occurring in coal mines, threatening workers in the underground
structures. The bumps can be induced by different circumstances. One of them is
an accumulation of energy in unpredictable dislocations. The measurement on
site for learning the position of bumps is very expensive and unreliable. One of
the most reliable approaches is physical modeling, which enables one to carry
out parametric studies and after certain results from these models one can assess
the most probable concentration of stresses. On the other hand, the stresses are
measured in a very difficult way, so that numerical analysis should be prepared.
In numerical analysis the contact problem in limit state estimation is based on the
data from physical modeling. Physical modeling seems to be the best for linear
analysis. This is not the case in our study and great efforts are needed to estimate
the real behavior of the material. The support of physical modeling mathematical
formulation and numerical treatment can lead us to the location of bumps. In
general, a large iteration should be used to solve the strongly nonlinear problem
in all subdomains ranged in boundaries given by possible dislocations, and on
the interfacial boundaries (dislocations). In order to eliminate some principal
directions of iteration the physical modeling is used and the numerical processes
become bearable. On the other hand, more dislocations can be sought by this
modeling and the only restriction needed is to know that no internal dislocations
are probable. It means that every discontinuity induces a statically determined or
undetermined problem. A typical example from practice verifies the theory based
on the back of the analysis.
Keywords
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