New Data on the Geological Structure of the Meghri HPP Hydrotechnical Tunnel Route Territory (Based on Geophysical Investigations)
Enviromental technologies
Abstract
The article considers the results of complex geophysical studies performed in the south of the republic due to the planned construction of the Meghri HPP with the Iranian side. The main task was to obtain the necessary data for selecting the optimal route for the underground supply hydrotechnical tunnel. The accuracyand informativity of the geophysical investigations are important for such adifficult area, which is located near the Meghri pluton. The Meghri pluton is one of the main reasons in this area, that influencesthe structure of the rocks. The, about 18 km long, hydrotechnical tunnel, which is for transmitting water from thewater collecting dam to HPP, should avoid deep faults, fractured zones and underground water basins. The depth of its passage, depending on the surface, varies on average from 100 to 400 m. The necessary data on the thicknesses and depths ofintrusive andmodern sedimentary rocks and the presence of tectonic faults are obtained. These data will be used to select the direction of the optimal tunnel route. It is proposed to implement geophysical works in the remaining not-studied segments of the designed hydrotechnical tunnel, which will make the drilling – geological and geotechnical field works more effective