Development of criteria for the identification of technogenic decompacted zones in the undermined array according to high-precision gravimetric observations

Abstract

In 2019-2021 studies were carried out in order to obtain information on the development of negative engineering-geological processes in the massif, due to the development of subsoil. A technique has been developed for high-precision monitoring gravimetric observations, which makes it possible to determine the change in the field over time. A physical geological model of gravimetric monitoring has been created, which is a homogeneous geological environment with an isolated area in which changes in rock density have occurred. For the purposes of gravimetric monitoring, a method for processing and interpreting dynamic gravity anomalies was adapted, based on the synthesis of qualitative and quantitative methods for extracting geological information from gravity data. The result of the interpretation is the area of distribution, the probable interval of depths of rock decompaction, as well as the magnitude of the change in rock density, which characterizes the intensity of the decompaction process. Examples are given of testing the developed technology for separating decompressed zones into natural and man-made zones at the Verkhnekamskoye potash deposit in order to increase the safety of its operation. It is shown that, based on the results of monitoring gravimetric observations, it is possible to predict areas of hazardous geological processes and to control the surface subsidence. The research was supported by a regional RFBR grant.