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Application of Statistical Methods for Evaluation of Rock-Burst Risks in Copper ore Mine Conditions |
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Application of Statistical Methods for Evaluation of Rock-Burst Risks in Copper ore Mine Conditions
Author: E. Takuska - Węgrzyn
The paper presents a proposal for a method of rock-burst risk estimation based upon an analysis of
the non-homogeneity degree of rock cracking processes. In periods preceding moments of tremors there
are tendencies towards enlargement of crack sizes causing increases in the non-homogeneity degree. It is
known that rock cracking is represented in the form of a seismoacoustic emission, which can be observed
(registered). The non-homogeneity degree of the cracking process can be estimated on the basis of the
statistical analysis of the registered seismoacoustic emission stream. It is known from experience that the
registered emission constitutes nonstationary and non-homogeneous stream of events. Information about
energies (extents) of processes and time intervals between effects is necessary for its complete description.
The paper presents appropriate models of measures describing the non-homogeneity degree of the cracking
process. These measures treated as indicative functions enable a qualitative connection between the
non-homogeneity degree discussed and the rock-burst risk condition. The fi ndings have been illustrated
with examples of behaviour of these measures estimated on the basis of the registered seismoacoustic
emission stream in the G-22/4 ZG „Rudna” Branch. |
2011