Assessing the efficiency of a complex of geophysical methods of rock mass research under the conditions of an underground mine

Abstract

Introduction. At present, geophysical methods of rock mass research have found wide application in mining and Earth sciences. They are used to perform prospecting and evaluation work in the massif, namely, to identify structural irregularities, voids and various contact zones of the media with sufficient accuracy. The accuracy of the results obtained depends on the method used in particular conditions, the nature and parameters of the target, the external conditions of the natural experiment, as well as the tasks set in the work. Research methodology. The work included a set of geophysical studies, namely, methods of spectral seismic profiling and GPR in an underground mine. Measurements were made to find different objects at different angles to the object in question in order to determine the distance to it. Research results. As a result of investigating with a complex of geophysical methods, a metal shelf was found under the bulk rock mass and two shelf tiers were subsequently separated when carrying out vertically directed measurements. In the process of searching for the underlying excavation in the massif during vertically directed geophysical measurements, which were carried out in the horizontal excavation 20 meters from the shaft, changes in spectrum density at a depth of about 55 m were detected, which coincides with the actual location of the sought excavation. The results of cavity search in rock mass when making measurements at an angle to the object sought showed that there are no sufficiently clear boundaries and it is impossible to estimate the distance to the cavity in the filled stopes.