scholarly journals Determination of parameters of non-uniform fractured rock massif in computing experiment

2018 ◽  
Vol 26 (1) ◽  
pp. 26-32 ◽  
Author(s):  
V. Fomychov ◽  
V. Sotskov
Keyword(s):  
Physical Nature ◽  
Rock Massif ◽  
Labor Costs ◽  
Computing Experiment ◽  
Computing Model ◽  
Operational Characteristics ◽  
Geological Conditions ◽  
Multiple Parameter ◽  
Geotechnical System

The purpose of work is creation of the computing model that based on qualifiers of described elements of geomechanical system that having the nonlinear physical nature. The procedure of computing experiment conducting that based on application of net numerical methods with determination of admissible precision limit is developed for various description schemes of mechanical condition of the environment. The iterative computing experiment under control of the system of the external estimated indicators that defining structure and a format of the description of computing area of finite element method during rock massif modeling is conducted. The area of admissible values of parameters of the elements description of geomechanical system during solution of multiple parameter problem of optimization for implicitly set entry conditions is determined. Application limits in computing models of the following groups of characteristics of description elements of computing model are defined: macro -, mini- and mixed. The three-level system of the description of mechanical characteristics of geotechnical system that managing of multiple parameter network of qualifiers of the elements description of computing area is received. Parameters of calculations of contact tasks in difficult structured geomechanical models are qualitatively improved that is provided by increasing in accuracy of the description of geotechnical system elements. Accounting of nonlinear characteristics allows performing optimization of schemes of bolting systems for various mine conditions that based on a computing experiment. The presented studies were carried out on example of conditions of the «Almaznaya” mine, southern conveyor drift, coal seam l1, depth 550m. As a result, preservation of operational characteristics of extraction mine workings of Western Donbas that were drived in complicated mining-and-geological conditions is reached by the choice of optimum parameters of bolting systems that allowing to minimize production expenses. Results that based on the executed computing experiments using the considered procedure allowed to keep operational characteristics of extraction workings with economy of materials and labor costs at the level of 9 – 17%.

About the concept of synthesis of high-performance detection and positioning systems in the areas of elements falling, separated from strategic and space missiles on the trajectories of their flight during tests and regular operation

2018 ◽  
pp. 10-21
Author(s):  
G. G. Vokin
Keyword(s):  
High Performance ◽  
Physical Nature ◽  
Positioning Systems ◽  
Physical Conditions ◽  
Highly Efficient

The article describes the approach and topical issues of synthesis of highly efficient transportable systems for search and determination of coordinates in the areas of elements falling, separated from the missiles, taking into account the dislocation of pre-empted areas of fall and physical conditions in their territories. The principles of these systems are based on the rational integration of traditional and non-traditional information sensors of different physical nature, which record the moments of landing of separated parts of the missiles.

scholarly journals Geomechanical justification of security measures in the development of the South Khingan deposit of manganese ore

2018 ◽  
Vol 56 ◽  
pp. 02014
Author(s):  
Maksim Rasskazov ◽  
Marina Potapchuk ◽  
Gennady Kursakin ◽  
Denis Tsoy
Keyword(s):  
Physical And Mechanical Properties ◽  
Rock Massif ◽  
Manganese Ore ◽  
Security Measures ◽  
The South ◽  
Rockburst Hazard ◽  
Field Development ◽  
Stage Of Development ◽  
Geological Conditions ◽  
Numerical Simulation Methods

The paper presents the results of geomechanical studies on the assessment of the potential rockburst hazard of the rock massif of the South Khingan deposit of manganese ore at the stage of development. Geodynamic zoning has been performed, mining and technical, mining and geological conditions of field development have been studied, and parameters of physical and mechanical properties of enclosing rocks and ores have been determined. Numerical simulation methods have been used to estimate the stress state of a rock massif at various stages of the deposit development. The tendency of the lower part of the South Khingan deposit to rockburst has been established. The complex of effective organizational and technical security measures has been substantiated in the development of this field.

Determination of the labor costs at pharmaceutical plants

1970 ◽  
Vol 4 (1) ◽  
pp. 55-57
Author(s):  
O. Ya. Lemberg ◽  
S. G. Latynina
Keyword(s):  
Labor Costs

Specific Features of Blasting Operations in Mining Minerals in Northern and Arctic Regions of Russia

2021 ◽  
pp. 102-106
Author(s):  
V.A. Tikhonov ◽  
G.A. Dudnik ◽  
S.Yu. Panfilov ◽  
V.V. Zhulikov
Keyword(s):  
Size Composition ◽  
The Arctic ◽  
Physical Parameters ◽  
Arctic Zone ◽  
Arctic Regions ◽  
Priority Task ◽  
Geological Conditions ◽  
The Russian Federation ◽  
Remote Operations

A priority task for facilitating the development of the Arctic zone of the Russian Federation is to design new blasting technologies to be efficiently used in extremely difficult climatic, mining and geological conditions at remote operations. This is further motivated by the fact that up to 40% of Russia's gold reserves, 60–90% of its natural gas resources and 100% of its primary diamond deposits are located in the Arctic zone. The article analyses the problems of blasting operations while developing deposits in the Arctic zone. The main formulations of ordinary explosives are reviewed that allow to solve a number of challenges associated with blasting operations in remote and hard-to-reach Arctic regions. Based on the performed analysis of existing methods, further areas of research are identified that can improve the quality and safety of blasting operations: 1) determination of optimum weight and dimensions of boosters based on ordinary explosives depending on the initiating borehole size; 2) determination of the relation between the particle size / composition of the booster and the detonation velocity; 3) determination of physical parameters of transition from deflagration to detonation and gaining sensitivity to the initiating pulse from the detonator cap by the ordinary explosive compositions.

scholarly journals Determination of the transfer step of the ore chute while mining the technogenic deposit of the bulk type

2020 ◽  
Vol 166 ◽  
pp. 02004
Author(s):  
Volodymyr Peregudov ◽  
Ihor Hryhoriev ◽  
Serhii Joukov ◽  
Yulian Hryhoriev
Keyword(s):  
Raw Materials ◽  
Mining Industry ◽  
Process Conditions ◽  
Geological Conditions ◽  
Scientific Task ◽  
Technogenic Deposit ◽  
Mining Works ◽  
The Cost

Further development of the open mining works on the domestic enterprises will be accompanied by the worsening of mining-geological conditions and declining of the quality of iron ore raw materials. In the same time, the accumulated mining wastes, that can make the technogenic deposits, pass into one of the important sources of the mineral raw materials. Taking into account this thing, the development and implementation of the modern technological circuits of the technogenic deposit development is an actual calling for mining industry, and determination and optimization of process conditions of the technogenic deposit development – is the scientific task of this publication. The obtained results of studies of the optimum step value of the ore chute transfer during the technogenic deposit development can be used by design organizations and mining enterprises for designing works. The obtained methodology and the proposed mathematical dependencies will reduce the cost of mining of the technogenic deposit due to the reasonable timely transfer of the open ore chute.

Research of the Mechanism of Destruction of Compression Molds for Casting under Pressure of Color Alloys

2018 ◽  
Vol 284 ◽  
pp. 326-331 ◽  
Author(s):  
R.V. Gavariev ◽  
I.A. Savin
Keyword(s):  
Vapour Deposition ◽  
Optimum Structure ◽  
Pilot Studies ◽  
Method Of Calculation ◽  
Operational Characteristics ◽  
Building Surfaces

In the article various approaches to a research of the mechanism of destruction of form-building surfaces of compression molds for the casting under pressure (CUP) are considered. The main reasons for emergence of various defects of working surfaces of form-building details are defined. Method of calculation of the parameters allowing to define operability of concrete products are specified. The option of production of form-building surfaces with the raised operational characteristics drawing sheetings by method of phisical vapour deposition (PVD). is offered. Results of pilot studies on determination of optimum structure of a covering for a form-building surface are given.

scholarly journals Determination of pressure in the near-ground space pile terminated and broadening of the surface

2018 ◽  
Vol 251 ◽  
pp. 04062
Author(s):  
Natalia Kupchikova
Keyword(s):  
Numerical Modeling ◽  
Circular Cross Section ◽  
Analytical Form ◽  
Soil Mass ◽  
Software Systems ◽  
Discrete Method ◽  
Building Foundation ◽  
Geological Conditions ◽  
Complex Engineering

The article deals with the problem of determining the stress state of a complex pile structure with end broadening in the form of a sphere in the soil mass in the analytical form by a discrete method. The calculation schemes for determining the stress tensor at the boundary of the pile of square and circular cross-section with expansions in the soil massif are shown. The elements of the polynomial are found by the discrete method in rectangular and spherical coordinates, which is a cumbersome complex mathematical apparatus for a modern design engineer. The stresses are determined. At present, as the analysis has shown, the solution of complex geotechnical problems of soil bases and foundations for different types of loads in numerical modeling is carried out using modern software. Numerical modeling and calculation with the help of specialized software systems allows to consider the system “building-foundation-ground foundation”, as dynamic, integrally developing. However, the interaction of the components of this system requires a theoretical justification of the resistance of foundations in the ground environment, especially in complex engineering-geological conditions.

Automated Determination of Protein-Nitrogen in Cereals and Grains

1977 ◽  
Vol 60 (6) ◽  
pp. 1238-1242
Author(s):  
Robert N Revesz ◽  
Norman Aker
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Organic Material ◽  
Combustion Products ◽  
Direct Reading ◽  
Protein Nitrogen ◽  
Operational Characteristics ◽  
Temperature Sample ◽  
Automated Determination

Abstract This paper presents the design, performance, and operational characteristics of a new direct reading instrument for determining nitrogen in cereal and grain. Precision, accuracy, range, speed, ease of operation, sensitivity, sample size, and flexibility of the instrument are presented. Results on various cereals and grains are presented and compared with those obtained by the Kjeldahl technique. The apparatus is the result of research for a rapid method for determining nitrogen in organic material. The instrument uses a combination of a unique high temperature sample oxidation, a sampling valve for separating combustion products, and thermal conductivity detection for the liberated nitrogen in a helium carrier gas.

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