ABSTRACT:

Experimental data are analysed obtained in the studies carried out in the Khibiny apatite mines on the Programme of the Kola Geodynamic Poligon. Mining effect on geodynamic regime in the geological medium is described The relationship is shown between the parameters of a rock mass deformation and the seismic events occurrence Discussed are possible precursors of tectonic rock bursts and mining-induced earthquakes

RESUME:

Les donnees experimentales obtenus au cours des travaux dans Ie mines de apatite des Khibiny d'après Ie programme du polygone geodynamique de Kola sont analysèes. La influence des travaux miniers sur Ie regime geodynamique de la milieu geologique est montree Les correlations des paramètre de la deformation des roches avec la manifestation des evenements seismologique de la classe energetique large sont marquees. Les possibles precurseurs des coups de roche geotectoniques et tremblements de terre provoques par les travaux miniers sont discutes

ZUSAMMENFASSUNG:

Es werden die bei den Untersuchungen in Chibiny-Apatit bergwerken nach dem Programm des Kolaer Geodynamischen Testfeldes gewonnenen experimentellen Daten analysier. Der Einflup der Bergbauarbeiten auf die geodynamischen Verhaltnisse des geologischen Mediums wird gezeigt. Testgestellt sind die Wechselbeziehungen zwischen den Deformationsparametem des gesteinsmassivs und dem Auftreten von seismischen Ereignissen einer breiten energetischen Klasse. Es werden mögliche Vorlaufer von tektonischen gebirgschlagen und durch menschliche Tatigkeit verursachten Erdbeben diskutiert.

1 INTRODUCTION

A man's activity and its effects on the geological medium are in the range of the most important problems to be solved in the field of environmental safety. These effects change the geological regime in the regions where large-scale engineering structures (hydraulic structures, mining enterprises) are located and extensive engineering activities (oil and gas production, nuclear explosions etc.) are performed. In this case, of most danger for the structures and for the territory around them are man-made earthquakes and tectonic rock bursts (Nikolayev 1977, Gupta 1976, Nikolayev 1993, Tryapitsyn 1992, Kozyrev 1993) causing substantial destructions in mining workings, underground communications and resulting in surface industrial and civil structures destroying, which attaches much importance to prediction and prevention of such phenomena. It is supported by world experience that prediction and prevention of powerful natural or man-made dynamic events occuring in the upper part of Earth's crust can be successfully carried out only using complex observing over as many as possible precursors (Sobolyev 1993). We were guided by this principle in arrangement of the observation network on the Programme of the Kola Geodynamic Poligon. Most part of this network is located in the Khibiny massif, the central part of the Kola peninsula (Figure 1a) The Khibiny massif is a typical representative of rock massifs, being composed of various large-scale geological structures. The Khibiny massif is subjected to different types of a man's activity resulting in increased seismicity. The structure of the massif, the parameters of mining systems and seismic activity are given in detail in (Tryapitsyn 1992, Kozyrev 1993, Tryapitsyn 1991, Melnikov 1988, Kremenetskaya 1995).

2 OBSERVING TECHNIQUE

In highly stressed rock masses, like the Khibiny massif, the deformations occur slowly within first units of relative deformations To reveal their tendency to change, it is necessary to use high precision and stable in time observation apparatus. Experience in registration of such processes proves that the apparatus used in carrying out seismological observations and in prediction of earthquakes, in particular, do correspond to the objectives mentioned above.

This content is only available via PDF.
You can access this article if you purchase or spend a download.