Angren coal pit Centralny landslide slope stability analysis based on a three-dimensional geological-geophysical model

Abstract

Introduction. In the course of mining mineral deposits by opencast, natural stress state of adjacent rock mass changes giving rise to geomechanical processes which lead to pit slopes deformation. It can be prevented by mean of detecting landslide-hazardous zone by using three-dimensional geological-geophysical models based on the data bases from prospecting surveys and geophysical sounding of the adjacent rock. Research aim is to develop and evaluate basic provisions of the methods of forecasting slope stability based on three-dimensional geological-geophysical models which include the following information: the results of geophysical sounding (waterlogged zones boundaries); databases of exploration wells (physicalmechanical properties of soils in the zones of water saturation and natural moisture content, and the relief of the natural surfaces of weakness); design and actual position of mine workings. Methodology. In order to find the most hazardous section in the adjacent rock mass an algorithm of forecasting has been proposed and adjacent rock mass stability has been analyzed based on threedimensional geological-geophysical models. Results. A three-dimensional geological-geophysical model of Centralny landslide has been constructed as a result of analyzing geological survey databases, surveying instrumental observations over the deformations, and electrical sounding of the adjacent rock mass. Values of the friction angle and cohesion were found with using the inverse calculation method. Centralny landslide stability forecast has been analyzed as of the year of 2018 and after the final completion of the first stage of loading-out the front section in 2025. Summary. Developed an algorithm of slope stability analysis makes it possible to solve the task of finding the most hazardous section or landslide area by means of computer-based realization.