A rock mass is a system of various scale blocks embodied into one another. Inter-block layers are usually composed of weaker and fissured rocks. On the action of dynamic-static loads, it can induce ...slip instability between blocks. In this paper, the slip instability laws of block rock masses are studied. Based on theory and calculation analysis finding that the friction force between rock blocks varies with block vibration and the friction between rock blocks can drop sharply, resulting in slip instability. The critical thrust and occurrence time of block rock masses slip instability are proposed. The factors affecting block slipping instability are analyzed. This study has significance to the rock burst mechanism induced by slip instability of rock masses.
For theoretical description of interaction between geomechanical and physicochemical processes in multiphase coal seams, the author for the first time proves the existence of an analytical ...“extension” of the operator connecting Langmuir’s equation and the kinematic expression for pendulum waves in highstress geomedia of hierarchical block structure.
The authors propose a novel methodological approach to up-to-date integrated satellite monitoring for studying origination of source zones of natural and induced catastrophes at large-scale subsoil ...use facilities in Siberia. This approach uses multimodal experimental geomechanical and geodynamic data of Earth remote sensing and digital technologies. This allows orientation at various applied aspects of mining technologies with regard to transition to processing and analysis of Big Data on slow deformation wave processes from the standpoint of nonlinear ‘geomechanical thermodynamics’. The article describes the estimation method for the Earth’s crust surface in Kuzbass Coal Basin using the lineament field analysis and the two-dimensional radar-base satellite data of Earth remote sensing. The use of the geoinformation technology software and testing results are presented as a case-study of a disastrous landslide at a large open pit coal mine in linkage with thermodynamic periods in the geomechanical behavior of the object of monitoring.
The new methodological approach to modern integrated geomechanical monitoring of large-scale subsoil use facilities in Siberia uses the multimodal and digital factories of diversified experimental ...and theoretical geoinformation. The main elements of the geoinformation system are described with definition of communications implemented via systems of orchestration of the data containers. The information aggregation and transmission technologies use the Internet of Things and include data storage, processing and systematization stages with regard to the available information on subsoil use assets. The trials of the information system in its different modes and options are described as a case-study of Kuzbass and Norilsk mining industry. The authors propose a new energy-based approach to the integrated analysis of nonlinear deformation waves and seismic emission processes within the framework of theory of pendulum waves.
This paper sets forth a geomechanics framework for assessing the energy efficiency of rotary percussive drilling using the energy criterion, which has been proposed by Victor Oparin for volumetric ...destruction of high-stress rocks having nonuniform physico-mechanical properties. We review the long-term research and development in the specified area of science and technology, including research and development projects implemented at the Institute of Mining, Siberian Branch of the Russian Academy of Sciences. A new modified expression of Oparin's dimensionless energy criterion of volumetric rock destruction k is introduced. The range of in situ values is determined for the energy criterion of volumetric rock destruction at the optimized energy efficiency of rotary percussive drilling. The temporo-spatial intervals of geotechnical monitoring are found to control pneumatic drilling energy efficiency at subsoil use objects in Russia. The integrated experimental, theoretical and geotechnical approach to the comprehensive investigation of real-time processes of rock fracture in rotary percussive drilling using the energy concept possesses the necessary geomechanical performance-and-technology potential to create the next level geotechnical monitoring of drilling systems for various purposes, including determination of physico-mechanical properties and the stress-strain analysis of rock mass in full-scale drilling.
The authors discuss application of the modern concept on rock mass structure as a hierarchy of blocks and the phenomenological basis of the pendulum wave theory in the context of source areas of ...destructive events in natural and nature-and-production systems. The phenomenological relationship is set between Zhurkov’s concentration criterion of fracture, experimental criterion of underground excavation “collapse,” canonical structure of spectrum of pendulum waves by Oparin and the long-range action of heavy explosion impacts in geomedia by Sadovsky-Adushkin. The article validates the energy approach to describing transformation of elastic energy of destructive event source areas into kinetic energy of structural elements of these areas. The authors introduce a new notion of “interference seismic emission events.”
Based on data from the ZTF photometric survey, we have revealed asynchrony of the polar SDSS J085414.02+390537.3. A beat period
days, during which the system changes its brightness by
, is ...distinguished in the light curves. Power peaks at the white-dwarf rotation period
min and orbital period
min are revealed in the periodograms, with the corresponding polar asynchrony being
. The photometric behavior of the polar points to a change of the main accreting pole during the beat period. Based on the Zeeman splitting of the H
line, we have estimated the mean magnetic field strength of the white dwarf to be
MG. The magnetic field strength near the magnetic pole has been found by modeling the cyclotron spectra to be
MG. The Doppler tomograms in the H
line exhibit a distribution of emission sources typical for polars in velocity space with evidence of the transition of the accretion stream from the ballistic trajectory to the magnetic one.
The scope of this expert and analytical review encompasses major achievements in the area of nonlinear geomechanics, geophysics, geomonitoring and advanced information technologies with a view to ...developing the natural and induced emergency prevention and response technology listed among the “national critical technologies” in the Russian Federation. The topical trends of the related R&D activities are basic research in physics and geomechanics of natural and induced failure source formation and growth in rocks and in mines, and creation of multi-layer geoinformation monitoring system for geomechanical and geodynamic safety in Russia. The authors believe that the described R&D activities may be the basis for an international multidisciplinary mega-project in geosciences: Engineering and Creation of the World’s Multi- Layer Geomechanical, Geodynamic and Environmental Safety Geoinformation Monitoring System.
Efficiency of energy-based criterion of volumetric rock destruction in estimation of drilling technology is theoretically validated and experimentally proved in in-situ rotary–percussion drilling in ...mines in Russia. The criterion is adapted to the performance of various drilling units by means of introduction of empirical coefficients for transformation of drilling energy intake to the relevant energy characteristics of stress rock fracture in face zone. The mathematical description of the criterion of minimum energy intake of rotary–percussion drilling depending on stress state and physical properties of rocks, and on force of rotary–feed mechanism is presented. The authors introduce a new geomechanical notion—factor of topological connection of rocks and give its analytical expression using experimental uniaxial compression and uniaxial tension strength of rocks, required in the design and improvement of rotary–percussion drilling in different geological and geotechnical conditions of mining.
The factors that have significant influence on efficiency of rotary–percussion rock drilling with downhole machines are discussed. The results obtained in physical simulation of dynamic driving of ...rock-breaking indenters in rocks are reported. The results are analyzed from the standpoint of the phenomenon of alternating response of rocks to dynamic impacts.
