Slope stability analysis of man-made soil body surrounding the abandoned hydraulic dump

Abstract

Introduction. Pit slope sections directly adjoining hydraulic dumps are characterized by the higher risk of landslide, especially in case of storing dry overburden rock over the hydraulically filled overburden. It is contributed to by the combination of the following factors: increase of the total height of the slope, development within the slope of a waterlogged zone of weakness with complex footprint map and depth configuration; excessive pore pressure within this zone which grows by means of adding dry dump to hydraulically filled rock. To reduce risks connected with man-made soil body slope stability violation, slope stability analysis is carried out based on the results of geological survey, hydrogeological observations and geophysical sounding. Research aims to analyze the stability of the Krasnobrodsky coal pit man-made mass adjoining the Bakhtykhtinsky hydraulic dump based on the 3D geological-geophysical model. Methodology. The authors of the article offered and realized the algorithm of analyzing the stability of slopes based on 3D geological and geophysical models formed by integrating geological, hydrogeological and geophysical data. Results. Based on geological survey data analysis, hydrogeological survey and electric sounding, 3D geological-geophysical model of a man-made soil body adjoining Bakhtykhtinsky hydraulic dump has been built. Slope stability analysis of an actual state of the man-made soil body has been carried out. ISSN 0536-1028 «Известия вузов. Горный журнал», № 5, 2020 55 Summary. In order to develop a 3D geological-geophysical model, in addition to slope geometry, it is necessary to set the boundaries of waterlogged rock in a footprint map and in depth, and monitor pore pressure within this zone. To determine slope section with minimum safety factor it is necessary to carry out cyclic calculation with gradual reduction of approach and design section rotation increment.