1887
Volume 14 Number 4
  • ISSN: 1569-4445
  • E-ISSN: 1873-0604

Abstract

ABSTRACT

Geophysical studies were conducted over a shallow mining excavation near a sinkhole that was created by partial collapse of the excavation. The main aim of this study was to detect the fractured zones induced by mining activity and so threatening the stability of the surface. To this end, geophysical surveys using microgravimetry, georadar, and electrical resistivity tomography techniques were carried out. However, although the results of these measurements were clear, yet the distribution of the fractured zones in the rock mass remained unclear. In this paper, the results of each individual geophysical technique used to detect the fractured zones and the ambiguities in the interpretation are presented. In order to properly analyse the data, a more complex interpretation were carried out using numerical modelling. Georadar and electrical resistivity tomography data provided the basis for gravity modelling, the results of which enabled confirmation of the presence of fractured zones. This had not been directly possible from the measured microgravimetric curve.

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2016-02-01
2020-01-25
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