Wyniki wyszukiwania - Biblioteka Nauki

1

Analysis of spatial distribution of mining tremors occurring in Rudna copper mine (Poland)

100%

Kozłowska M.

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tom Vol. 61, no. 5

1156--1169

EN

The distribution of mining tremors is strictly related to the exploitation progress of mining works and, consequently, to the local stress field. In case the distribution is known, it is possible to determine future area of intensive seismicity in exploited mining panel. In the paper, an analysis of working face-to-tremor distance for Rudna copper mine in Poland is presented. In order to develop a spatial model of tremors’ occurrence in the exploited mine, the seismicity of four mining sections in the five-month period was investigated and the tremors’ distribution was obtained. It was compared with the spatial distribution of tremors in coal mines found in the literature. The results show that the places where tremors mostly occur — the vicinity of the face, in front of it — coincide with the high-stress area predicted by literature models. The obtained results help to predict the future seismic zone connected with planned mining section, which can be used in seismic hazard analysis.

2

Extending the double-difference location technique to mining applications part I: Numerical study

100%

Rudziński Ł. , Dębski W.

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tom Vol. 59, no. 4

785-814

EN

The location of the seismic event hypocenter is the very first task undertaken when studying any seismological problem. The accuracy of the solution can significantly influence consecutive stages of analysis, so there is a continuous demand for new, more efficient and accurate location algorithms. It is important to recognize that there is no single universal location algorithm which will perform equally well in any situation. The type of seismicity, the geometry of the recording seismic network, the size of the controlled area, tectonic complexity, are the most important factors influencing the performance of location algorithms. In this paper we propose a new location algorithm called the extended double difference (EDD) which combines the insensitivity of the doubledifference (DD) algorithm to the velocity structure with the special demands imposed by mining: continuous change of network geometry and a very local recording capability of the network for dominating small induced events. The proposed method provides significantly better estimation of hypocenter depths and origin times compared to the classical and double-difference approaches, the price being greater sensitivity to the velocity structure than the DD approach. The efficiency of both algorithms for the epicentral coordinates is similar.

3

Tomografia sejsmiczna w górnictwie

75%

Dębski W.

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tom T. 68, nr 7

67--71

PL

Prędkościowa tomografia sejsmiczna jest techniką bezinwazyjnego obrazowania budowy wewnętrznej próbek skalnych, masywu skalnego, struktur geologicznych itp. w skalach począwszy od ułamka metra do tysięcy kilometrów. Otrzymywane tą techniką przestrzenne rozkłady prędkości fal P i S są zwykle interpretowane w kontekście strukturalnej budowy badanego górotworu. Jednakże, z punktu widzenia zastosowań w górnictwie jednym z najważniejszych elementów badania tomograficznego jest próba interpretacji otrzymanego obrazu tomograficznego pod kątem stanu naprężeń w górotworze. Osiągnąć to można albo przez próbę korelacji aktywności sejsmicznej z anomaliami rozkładu prędkości albo przez interpretacje anomalii prędkości pod kątem zmiennego w przestrzeni pola naprężeń. Niezależnie od wybranego podejścia dla poprawnej interpretacji tomogramów bardzo ważna jest ocena wiarygodności otrzymanych pól prędkości. Celem niniejszej pracy jest przybliżenie zasad tomografii sejsmicznej oraz wspomnianego powyżej dwoistego podejścia do praktycznej interpretacji wyników badań tomograficznych.

EN

The seismic velocity tomography is a non-destructive technique of imaging of the structure of rock samples, rock mass, geological structures etc. at scales ranging from centimetres up to thousands of metres. The obtained by use of this technique spatial distributions of P and S waves are usually interpreted in the context of the internal structure of the imaged rock mass. However, from the point of view of applications in mining one of the most important elements of tomographic inversion is the attempt of interpretation of the obtained tomographic image in the context of the state of stresses in the rock mass. This can be achieved either by an attempt of correlation of seismic activity with anomalies of the velocity distribution or by the interpretation of velocity anomalies in terms of lithological parameters. Independently of the chosen approach, for correct interpretation of tomograms very important is the assessment of reliability of obtained velocity fields. The aim of the present work is the approximation of seismic tomography rules and mentioned above dual approach to the practical interpretation of tomographic investigation results.

4

Predictive model of seismic vibrations’ peak value induced by multi-face blasting

63%

Fuławka K. , Stolecki L. , Mertuszka P. , Szumny M. , Anderko A.

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tom Vol. 22. iss. 3

248--256

EN

The seismicity level induced by blasting in the Polish copper mines is very important inlight of the efficiency of active rockburst prevention and safe conduct of blasting operations in the vicinity of the mining infrastructure such as shafts, workings, or function chambers (e.g., workshops, storages, etc.). Knowledge of the seismic vibrations' peak value might be the basis for designing blasting works in a way that ensures desired seismic effect. However, current experiences show that Peak Particle Velocity prediction models developed so far do not apply to multi-face blasting, where there are many vibrations’ sources at the same time dotted across the mining panel. This paper presents the assumptions of a new empirical model with validation data gathered in the underground trials of group blasting. This new method allows for determining the vibration level generated by firing a single face and the value of amplitude amplification resulting from the increased number of faces fired simultaneously in the group. Preliminary analysis shows that this newly developed predictive model is characterized by a high level of reliability and therefore was applied to assess the effectiveness of blasting works in the selected panel in one of the mines belonging to KGHM Polska Miedz S.A.

5

Wykorzystanie badań geofizycznych w kopalni 'Mysłowi-ce' do ograniczenia zagrożenia tąpaniami

51%

Goszcz A. , Matwiejszyn A. , Ptak M. , Sznster J.

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tom T. 54, nr 11

9-19

PL

Kopalnia 'Mysłowice' od 1978 roku do oceny stanu zagrożenia tąpaniami slosuje metody geofizyki. Są to metody: sejsmologiczna, sejsm o akustyczna, prześwietlań i profilowań sejsmicznych oraz grawimetryczna. W ciągu prawie 20 lat stosowania tych metod w kopalni zgromadzono dużą ilość wyników. Sposób ich wykorzys-tywania przez kopalnię oraz kompleksowa analiza zgromadzonych ' 'ormacji geofizycznych stanowi przedmiot niniejszej publikacji.

EN

Ths geophisical methods have been used at Myslowice Mine for the roi.< bumps hazard determination since 1978. There are the following methods: seismologjcal, seism oacustic, seismic geotomo-aaphy and logging as well as gravimetric. During almost 20 years of these methods application a considerable number of results has been collected at the mine. The way of making use of them by the mine and a complex analysis of the gathered geophisical information are the mbject of this paper.