Method and equipment for the safe development of preparatory workings in the gas-bearing coal seams

The article describes a method and equipment for the safe development of preparatory working on a gas-bearing, outburst hazardous coal seam by a heading machine. The described method significantly prevents the gas emission during mining operations. Determination of the amount of degassing and relief wells is performed according to the given in article mathematical formulas. This ensures a significant increase in the level of safety processing the preparatory roadway on a gas-bearing, prone to outbursts coal seam by a heading machine. Due to this, the speed of conducting excavation increases and the cost of mining is reduced. The proportionality coefficients of the mathematical models were determined. Mathematical models are used to calculate the number of relief and degassing wells, which are drilled during the impulse hydraulic loosing of the nearby part of the coal seam. Also the duration of liquid injection into a coal seam is also determined. Mathematical models for calculating the number of injection, unloading and degassing boreholes can be used in development of the passports for conducting preparatory workings on a gas-bearing, prone to outburst coal seam by a heading machine with a preliminary impulse hydraulic loosing of the nearby part of a coal seam.

Download Full-text

Determination of the Boundaries of the Compressible Strata When Conducting Engineering Surveys

Proceedings of Southwest State University ◽

10.21869/2223-1560-2020-24-3-79-87 ◽

2020 ◽

Vol 24 (3) ◽

pp. 79-87

Author(s):

K. O. Dubrakova ◽

V. A. Solodilova

Keyword(s):

Sandy Loam ◽

Physical And Mechanical Properties ◽

Fine Sand ◽

Coarse Sand ◽

Adequate Accuracy ◽

Practical Standpoint ◽

The Cost ◽

The Given ◽

Main Influence

Purpose of research. Errors and inaccuracies in the preparation of deliverables based on the results of engineering surveys which are an integral and important part of the design and estimate documentation, can lead to irreversible consequences and significantly reduce the life of buildings and structures. The main difficulty in investigating soil physical and mechanical properties at a construction site is to determine the depth of excavation. This is due to the fact that an increase in the calculated depth leads to the increase in the cost of work, and its decrease leads to the risk of inaccuracies and errors in the design of foundations of buildings and structures. In accordance with the current regulatory documents, the excavation depth during soil investigation should be 1-2 meters below the boundary of the compressible strata. The condition on the basis of which the specified boundary is determined is provided. The development of a technique that allows determining the depth of the compressible strata at the stage of engineering surveying with adequate accuracy is an important task from a practical standpoint. Methods. Determining natural stress Ϭzg,0 as the product of foundation depth d and the specific gravity of the soil above the base ɣ′ІІ, , taking into account the fact that the average pressure tends to the value of the estimated resistance of the soil, it is shown that physical-mechanical structure of the base soil exerts the main influence on the parameters of the compressible strata, and correspondingly, to the excavation depth value. In this case, the stresses transferred by the foundation of a building or structure have an indirect effect. Results. The maximum values of the depth of excavation for engineering and geological surveying for tight coarse sand, medium density and fineness sand, and fine sand and sandy loam are determined. Conclusion. It is concluded that the given technique allows determining the depth of excavation during engineering and geological surveying with an adequate accuracy.

Download Full-text

Improving the operational efficiency of tractors by ensuring their ability to perform work

BIO Web of Conferences ◽

10.1051/bioconf/20201700111 ◽

2020 ◽

Vol 17 ◽

pp. 00111

Author(s):

Sergej Yahin ◽

Fanil Gabdrafikov ◽

Farit Khaliullin ◽

Rail Khusainov ◽

Insaf Naficov

Keyword(s):

Working Conditions ◽

Climatic Conditions ◽

Industrial Complex ◽

Technical Equipment ◽

Actual Volume ◽

Design Documents ◽

The Cost ◽

Market Relations ◽

The Given

Development of agriculture in conditions of market relations is accompanied by aggravation of the problem of efficiency of use of technics. In this connection, the task of scientists is to increase the actual volume of work performed by tractor units, reducing the cost per unit of production. The high cost of tractors, the lack of personnel, the reduction of technical equipment of farms and the increase in the volume of products produced in the agro-industrial complex, natural and climatic conditions impose special requirements on technical service to maintain tractors in working conditions. The working state of tractors is the state at which values of parameters, which characterize ability to execute the given functions, correspond to normative-reference and design documents. During the operation of tractors in agriculture under the influence of various factors, wear of their parts and knots. The indicator determining the value of wear is the residual resource of aggregates and knots of technics. In the article the questions of influence of residual resources of basic aggregates and systems of tractor on frequency of failures of various groups of complexity are considered. Experimental research on determination of dependencies of residual resources of tractor units and frequency of failures of different groups of complexity, on the basis of which the rules of replacement of the unit whose resource are exhausted, is carried out, i.e. is replaced with a full of the resource (new) or on the aggregate after overhaul.

Download Full-text

DYNAMICS OF GAS EMISSION FROM EXPOSED SURFACE OF GAS-BEARING COAL SEAMS HAVING MEDIUM THICKNESS

Sustainable Development of Mountain Territories ◽

10.21177/1998-4502-2021-13-3-441-448 ◽

2021 ◽

Vol 13 (3) ◽

pp. 441-448

Author(s):

Nikolai KACHURIN ◽

◽

Galina STAS ◽

Alexander KACHURIN ◽

◽

...

Keyword(s):

Coal Seam ◽

Mathematical Models ◽

Driving Forces ◽

Mathematical Physics ◽

Gas Release ◽

Coal Seams ◽

Excessive Pressure ◽

Methane Release ◽

Mine Workings ◽

Gas Bearing

The goal of the research was to clarify the regularities of the dynamics of gas release from the surface of the outcrop of the developed coal seam. The main research methods were theoretical methods of mathematical physics and non-equilibrium thermodynamics. Gas-bearing coal seams are usually mined underground. When driving development workings, outcropping surfaces of gas-bearing coal seams appear and gases in the seams under excessive pressure are released into the atmosphere of the mine workings. Gas-bearing coal seams are usually mined underground. When driving preparatory workings, surfaces of outcropping of gas-bearing coal seams arise and gases that are in the seams under excessive pressure are released into the atmosphere of the mine workings. The most important gas-dynamic characteristic of this process is the rate of gas release, which represents the volume of gases released from a unit area of exposure of a coal seam per unit of time. A generalized law of resistance for gas filtration in a rock mass is recommended, and a fairly rigorous thermodynamic substantiation is given. It is shown that the densities of gas mass flows in accordance with the postulate of their linear relationship with the driving forces are determined by the Onsager relation. The results obtained and their discussion is presented. Mathematical models are proposed for engineering calculations of the dynamics of methane release from the outcropping surface of medium-thick coal seams. The error of the adopted approximations does not exceed 3%. The intensity of methane release is directly related to the planogram of work in the working face. Analysis of this dependence indicates that during the extraction cycle, methane release increases due to an increase in the area of the gas-release surface. The main conclusions are as follows: mathematical modeling of the processes of gas movement in a porous sorbing medium using approximate mathematical models representing linearized equations of mathematical physics; the regularities of the dynamics of the rate of gas release from the surface of the outcrop of a gas-bearing coal seam is the theoretical basis for the mathematical description of the process of gas release; the use of a linearized hyperbolic filtration equation most accurately describes the processes of methane release from the outcropping surface of mined coal seams.

Download Full-text

Mekanisme Dan Proteksi Jaminan Nasabah Pada Gadai Informal

Liquidity ◽

10.32546/lq.v6i2.27 ◽

2017 ◽

Vol 6 (2) ◽

pp. 103-109

Author(s):

Yuri Nanda Larasati ◽

Jafril Khalil

Keyword(s):

Qualitative Research ◽

Research Methods ◽

Financial Services ◽

Field Data ◽

Qualitative Research Methods ◽

Research Field ◽

Consumer Society ◽

Library Research ◽

The Cost

Regulation of the financial services authority (OJK) No. 31/POJK.05/2016 on Venture had arranged that the financial services agency on the basis of the law of pledge is in coaching and supervision OJK. Yet the existence of laws – invitation to Governing Enterprise pawn shops causing business activities conducted by the above parties are not yet regulated. The condition is feared could cause harm to the consumer society. The purpose of this research is to know the procedures, mechanisms, protection of goods and guarantee the consumer on an informal pledge financing, methods of determination of the cost of maintenance of the goods and the goods of the execution mechanism of the pledge as well as protection for the collateral items are viewed from the side of the consumer by looking at laws-invitations and Sharia. To find out whether the pledge have gotten permission from OJK. This research uses qualitative research methods with the study of library research, field data and simulations. The approach used in this study is the empirical juridical approach. Elaboration upon the results is discussed further in this article.

Download Full-text

The Role and Place of Budget Procedure in the System

Voprosy Ekonomiki ◽

10.32609/0042-8736-2003-5-42-49 ◽

2003 ◽

pp. 42-49 ◽

Cited By ~ 1

Author(s):

E. Bushmin

Keyword(s):

Budget Process ◽

Public Expenditures ◽

Principal Role ◽

Process Trends ◽

The Given ◽

Rules Of The Game

The article is devoted to the analysis of improving budget process trends. The author offers the concept of "financial technologism". Its usage should promote an essential improvement of the budget process. The given concept is based on the fact that the regulation of budget procedure is the process of determination of "rules of the game", and the order of interaction of different institutions within the framework of the budget process, and the trends and volumes of expenses are the strategy of institutions. The procedure within the budget process plays a principal role as compared with the trends and volumes of public expenditures.

Download Full-text

The Awareness Level of the Safety and Health of the Operational Level

ADVANCES IN BUSINESS RESEARCH INTERNATIONAL JOURNAL ◽

10.24191/abrij.v3i1.10036 ◽

2017 ◽

Vol 3 (1) ◽

pp. 42

Author(s):

Roshanira Che Mohd Noor ◽

Nur Atiqah Rochin Demong

Keyword(s):

Health And Safety ◽

Health Conditions ◽

Effective Strategies ◽

Operational Level ◽

Safety And Health ◽

Health Factors ◽

The Cost ◽

The Relationship ◽

Awareness Level

Providing a safe and healthy workplace is one of the most effective strategies in for holding down the cost of doing construction business. It was a part of the overall management system to facilitate themanagement of the occupational health and safety risk that are associated with the business of the organization. Factors affected the awareness level inclusive of safety and health conditions, dangerous working area, long wait care and services and lack of emergency communication werethe contributed factors to the awareness level for the operational level. Total of 122 incidents happened at Telekom Malaysia Berhad as compared to year 2015 only 86 cases. Thus, the main objective of this study was to determine the relationship between safety and health factors and the awareness level among operational workers.The determination of this research was to increase the awareness level among the operational level workerswho committing to safety and health environment.

Download Full-text

MODIFIKASI MODEL PEMBELAJARAN TEAM ASSISTED INDIVIDUALIZATION DENGAN STRATEGI PEMBELAJARAN TUGAS DAN PAKSA

Prosiding Seminar Nasional Pendidikan KALUNI ◽

10.30998/prokaluni.v2i0.58 ◽

2019 ◽

Vol 2 ◽

Author(s):

Lea Christy Restu Kinasih ◽

Dewi Fatimah ◽

Veranica Julianti

Keyword(s):

Cooperative Learning ◽

Learning Strategies ◽

Learning Process ◽

Learning Model ◽

Learning Models ◽

Classroom Learning ◽

Quality Of Learning ◽

The Given

The selection and determination of appropriate learning strategies can improve the results to be obtained from the application of classroom learning models. This writing aims to discipline students to develop individual abilities of students to be more active in the learning process and improve the quality of learning. The learning process in Indonesia in general only uses conventional learning models that make students passive and undeveloped. In order for the quality of learning to increase, the Team Assisted Individualization learning model is combined with the task learning and forced strategies. The Team Assisted Individualization cooperative learning model is one of the cooperative learning models that combines learning individually and in groups. Meanwhile, task and forced learning strategies are strategies that focus on giving assignments that require students to complete them on time so that the learning process can run effectively. Students are required to do assignments according to the given deadline. This makes students become familiar with the tasks given by the teacher. Combining or modifying the learning model of the assisted individualization team with forced and forced learning strategies is expected to be able to make students more active, disciplined, independent, creative in learning and responsible for the tasks assigned. Therefore this method of incorporation is very necessary in the learning process and can be applied to improve the quality of learning in schools.

Download Full-text

MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 13. DETERMINATION OF DEFORMED STATE UNDER STRAITENED EXTRUSION IN FOURTH CENTRAL AREA OF PLASTIC DEFORMATION

Technology of metals ◽

10.31044/1684-2499-2020-0-4-43-51 ◽

2020 ◽

Vol 0 (4) ◽

pp. 43-51

Author(s):

A. L. Vorontsov ◽

◽

I. A. Nikiforov ◽

Keyword(s):

Plastic Deformation ◽

Plastic Flow ◽

Central Area ◽

Direct Extrusion ◽

Deformed State ◽

Cumulative Deformation ◽

The Given ◽

General Method

Formulae have been obtained that are necessary to calculate cumulative deformation in the process of straitened extrusion in the central area closed to the working end of the counterpunch. The general method of plastic flow proposed by A. L. Vorontsov was used. The obtained formulae allow one to determine the deformed state of a billet in any point of the given area. The formulae should be used to take into account the strengthening of the extruded material.

Download Full-text

Influence of a chemical preparation of triazole50% cs on sowing the winter wheat against rust

International Journal on Integrated Education ◽

10.31149/ijie.v3i9.626 ◽

2020 ◽

Vol 3 (9) ◽

pp. 231-233

Author(s):

AliyevSh.K. ◽

TuychiyevI.U ◽

Karimov N ◽

Umaraliev.M.I

Keyword(s):

Winter Wheat ◽

Field Experiments ◽

Yellow Rust ◽

Biological Efficiency ◽

Chemical Preparation ◽

Seed Growth ◽

Biological Farming ◽

The Given ◽

Farming Efficiency

The article is focused on the data of the carried works on studying biological efficiency of fungi Triazole 50% on sowing the winter wheat against yellow rust as well as on the height, development and fertility of the wheat. On May 5, 2019 from 9 to 10 o’clock under the temperature 21-23 field experiments of Triazol 50% CS manufactured by the firm “Agroximstar” (Uzbekistan) were carried out on winter wheat as a protector of seeds of winter wheat of Pervitsa sort against the disease of yellow rustin the irrigated conditions in an experimental field of the Institute “Istiklal” of Andijan district of Andijan region. The aim of the given research is to study biological-farming efficiency and determination of optimal norms of preparation expenses and to study the influence of fungicide on the height and development as well as on the fertility of the wheat. The received data showed that the preparation Triazole 50% CS effected on the pathogen of yellow rust favorably and besides that it didn’t effect on seed growth and energy of growth negatively.

Download Full-text