Gornye nauki i tekhnologii = Mining Science and Technology (Russia)

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No 3 (2017)
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3-10 724

Among the reliable tunneling complexes, without which it is impossible to create conditions for such a high-performance process, as mining of mine workings are geokhods. Since the geometric parameters of the external engine and the screw channel vary, the  process of interaction of the geokhod systems with the geo- environment and with each other requires mathematical modeling. Modeling allows presenting schemes of interaction with  various environments: loose (viscous-mobile) and strong. The  mobility of the geoenvironment provides interaction along the entire  supporting surface of the blade, so increasing the blade area leads to an increase in tractive effort. In strong rocks, the interaction occurs  along the supporting surface of the blade, and the free surface may  not touch the rock. Thus, in the interaction of the external propeller (HP) with the geoenvironment, the blade deforms; it is possible to  form a region of crushing of the rock, and taking into account the  elastic deformation in determining the geometric parameters of the  blade and the canal will minimize the process of forming the region  of crushing; when modeling the process of interaction of the VD with the medium, the load can be considered as uniformly distributed and equal to the ultimate strength of the rock for uniaxial compression.

11-17 344

The creation of machines for heavy mining conditions is impossible without solving the problems associated with the drive. The widely  used hydraulic drive has a number of drawbacks that can not make it uniquely acceptable. More successful is the electric drive, which  takes advantage of the stepping electric drive, but its scope is  limited by the parameters of the hydraulic motors. That is why it is  necessary to create a so-called discrete hydro motor drive that  would allow generating pulses of small volumes with high  frequencies to move the output links to specified distances with high accuracy in a wide range of speeds. This determines the relevance of the scientific and practical task under consideration. Conclusion: the  use of dispensers will allow the implementation of discrete hydraulic drive systems, but for its final implementation it is necessary to  justify the dynamic and geometric parameters of the device, as well as circuit solutions for the use of such dispensers.

18-24 406

Detailed investigation of mechanical, deformation and rheological properties of frozen soils is an actual issue, as they are basis of civil- engineering survey for underground constructions in permafrost  holding more than 50% of the territory of Russia. The majority of  modern software packages which calculate structures stability  considering stress state of soils massive, demand knowledge of  mechanical and rheological parameters defined by triaxial  compression tests. The current article presents: estimation method  of frozen soils rheological parameters by triaxial compression  testing; required equipment and the research results. The samples  of frozen soil 10 – 50 m depth from Kharasavey gas field were used  as test material. Mostly they are presented by loam, clay and sand.  The experiments were run at the range of temperature from −3°C to −6°C.. Triaxial compression testing was provided by the laboratory  equipment which allows to run experiments in the mode of  automatic load, maintenance and deformation processes  registration. Test procedure of rheological parameters identification  under conditions of long-term triaxial compression considered  incremental load Stage duration was equal to 24 hours. The  experiments were run until th specimen’s failure. As a result of the  testing, mechanical, deformation and rheological parameters for  frozen soils are defined at temperatures −3°C  −6°C. The achieved results can be interpreted in different models (Mohr-Coulomb,  Drucker-Prager, Tresca etc.). The described experiments were carried out at LLC Gazprom Geotechnology for the design of underground drill cutting s storages in permafrost.


47-79 504

The electric power system of the Russian Federation was most developed in the 80-90s of the last century, after which there was an almost twofold decline in the generation and transmission of  electrical energy in the system with subsequent growth. The main  problem of fuel and energy complexes is the progressive aging of  fixed production assets in conditions of increasing energy  consumption requirements, which is a source of increased risk of  major accidents. In this case, negative disturbances can arise both in the system itself and be external to it and can lead not only to a low  quality of electrical energy but also to interruptions in power supply.  The studies carried out to date are devoted to a quantitative  assessment of the reliability of power supply systems and their  equipment and do not take into account the effects of electrical equipment failures on the characteristics of production processes and the operation of technological machines. To consider the reliability of power supply systems in isolation from the operation of other systems (technological, relay protection, automation, ventilation, dewatering, etc.) means not to use the whole range of measures  aimed at improving the reliability of electricity supply, as a result it is impossible to ensure the optimum level of reliability of electricity  supply. Reliability of the power supply system must be evaluated taking into account the interaction of electrical equipment with the  equipment of all production systems. The problem of increasing the  efficiency of the functioning of industrial enterprises by optimizing  the parameters of the reliability of power supply systems is topical and of great economic importance.

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ISSN 2500-0632 (Online)