The paper considers the problem of assessing the initial stress-strain state of a rock mass under the influence of modern geodynamic movements as a fundamental initial stage in zoning territories according to the risk factor of techno-natural disasters during subsoil use. It is proposed to use the results of monitoring of modern geodynamic movements of permanent stations of the GNSS system, as well as observations of geodetic signs using GPS / GLONASS satellite geodesy technologies, as initial information for assessing the parameters and patterns of the formation of a stress-strain state in territories of various scale levels. The scientific approach proposed in the work and the methodological provisions for applying the results of monitoring the deformation processes of the earth's surface provide the initial stage in solving the problem of zoning territories according to the risk of techno-natural disasters in subsoil use, which consists in assessing the parameters of the initial stress-strain state of a rock mass.

Relevance of the study is conditioned by wide spread problem of prevention of water mass breakthroughs into underground mine workings, successful solution of which in many respects determines the efficiency and safety of exploration.The aim of the research is to study the interrelation of modern geodynamic movements with danger of water objects breakthrough into mine workings during development of deposits in difficult hydrogeological conditions.Object: massif of deposits in difficult hydrogeological conditions, located under a powerful sedimentary stratum containing several aquifers.Methods: analytical, satellite positioning with dual-frequency GPS geodetic receivers, computer simulation of vector and tensor deformation field.Results. Based on the analysis of occurred emergency situations related to water breakthroughs at the mines, their causes and methods of prevention, it was found that one of the most important factors causing a breakthrough of water bodies are modern geodynamic movements that form a heterogeneous mosaic stress-strain state in the rock mass, which prevents the preservation of the integrity of water-protective massifs. The known methods to prevent the danger of water breakthrough in the rock by laying the depleted space and maintaining the overlying thickness of the whole, the appointment and application of parameters of treatment works without taking into account the formation of real tensely-deformed state under the influence of modern geodynamic movements are usually accompanied by accidents. As recommendations for prevention of water breakthroughs into the mine workings the method of studying modern geodynamic movements and the stress-strain state formed by them was presented and tested on the example of the massif Elanskoe and Elkinskoe polymetallic deposits. The vectors of trend movements of points together with the tectonic structure of the investigated region are established. Maximum vertical rises and maximum horizontal displacements were fixed. The obtained results of measurements using mathematical apparatus of solid medium mechanics were transformed into vectorial and tensor representation of deformation field with selection of main components of deformation tensor.Conclusions. The studied array is located in the temperate zone of stress-strain state with a characteristic multi-directionality of the deformation tensor, which leads to the development of shear deformations in an array of rocks, adversely affecting the stability of rock workings, as well as contributing to the disclosure of natural structural disorders of the array of rocks and improvement of its filtration properties. Increase of reliability of applied methods for preventing the danger of water breakthroughs into mine workings demands carrying out of special researches of formation of a real tensely-deformed condition and consideration of its parameters at designing and conducting clearing works.

The authors discuss one of the key objectives of geomechanics as a mining science. It consists on the investigation of deformation processes phenomena in rock mass and ground surface toward safe and efficient subsoil management as a type of economic activity, as well as for safe and sustainable operation of permanent underground and surface facilities of subsoil use. The emphasis is laid on the fact that subsoil facilities are not only the permanent structures meant for mineral mining and haulage but also the city and industry infrastructure, transportation lines, power generation and water bodies, high-rise structures, etc. for which underground rock mass and ground surface are the integral geotechnical component. All these subsoil use facilities are subject to risk of instability in case of natural and man-made disasters caused by deformation processes in rock masse and on ground surface. The current advances of geomechanics in the stress-strain analysis of rock mass, revealing its discreteness, mosaic structure and variability of stress and strain patterns in time, have offered a new insight into the sources and causes of natural and man-made catastrophes at the subsoil use objects and make it possible to push the limits of modern problems and objectives of geomechanics.

The procedure and data of many years-long geodynamic monitoring of the ground surface displacements in the Uzelga and Talgan mining areas are presented. Despite similar geological conditions, the difference in the types of the protected objects on the ground surface commands different variants of the procedure for each deposit. Some points of reference surveying network and observation plugs are re-fixed using the satellite data, digital elevation meter and electronic tachometer, and characteristics of trends in modern geodynamic movement induced by a displacement trough are obtained. As a result of the implemented geodynamic activity assessment, vectors of general spatial displacements of observation plugs and curves of compression–tensions and shearing strains are determined. It is found that rock mass deformation has a discrete mosaic pattern. The conclusions are generalized, and the hypotheses are made on the further deformation of the ground surface.

Problem Statement (Relevance): This article describes the methods and results of securing open-pit walls aimed at protecting the hazardous areas of haulage benches from sudden collapses and landslides. The methods highlighted allow for a number of factors, such as the rock mass structure; current earth movements; secondary stress-strain state creation patterns. Methods Applied: Advanced geophysical methods were applied for the comprehensive instrumentation-based analysis of the rock mass structure; satellite geodesy was applied for the definition of both tectonic and man-affected stress-strain states of a rock mass while taking into account the creeping and short-term cyclical movements in the large and small bases. The geophysical methods were applied to check the open-pit field for tectonic faults while identifying the most hazardous areas adjacent to the areas where the pit walls cross the major tectonic faults found. After that the locations of the major faults were verified and the medium size faults were located and documented. As a result, a fault map was generated for the near-wall rock mass. Direct methods of geodesy were used to register the changes in the initial stress-strain state of the rock mass with the definition of the space components of two current earth movements the creeping movement and the short-term cyclical movement. The stress-strain state of the rock mass was analysed through solving an inverse geomechanical problem based on the measured rock mass deformations. Findings: The comprehensive approach described in the article, which includes the analysis and synthesis of the deposit tectonics data and the experimental and theoretical studies of the rock mass stress-strain state based on satellite geodesy and the geophysical analysis of the structure, helped accomplish the task of identifying hazardous areas in terms of haulage bench stability.

The procedure for determining the slope angles of the pit edges and new approaches to their stability control with regard for the initial tectonic and secondary stresses in the rock mass are considered. Using satellite geodesy, the instrumental investigations into strains of pit edges and adjacent territories are realized.