Selection of a strata pressure reduction method to extract deeper level reserves of Mir pipe

2021 ◽  
pp. 53-57
Author(s):  
V. A. Zaprudin ◽  
A. V. Kotenkov ◽  
I. V. Zyryanov ◽  
A. S. Kulminskiy
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Mine Planning ◽  
Pressure Reduction ◽  
Conceptual Approach ◽  
Ore Body ◽  
Mineralized Water ◽  
Study Results ◽  
Mining Safety ◽  
Research Findings

The article presents the chronology and stages of mining resumption at Mir pipe. The initiatory steps of the conceptual approach to underground mining of ore reserves at the depth greater than 1500 m are described. The primary measures on catchment of highly mineralized water from Metegero-Ichersky aquifer are identified. The exploratory study results on deeper level mining safety in the future underground mine in terms of the strata pressure reduction are given. The authors in detail discuss two methods of rock mass destressing: destressing drilling and formation of protection layers with different parameters at the depths of 1000 m and greater. Natural stress state of rock mass is modeled in Rocscience RS3 environment. The analyses of the mathematical models of ore and enclosing rock destressing show that the safest and the most effective methods of dеstressing of deeper level rock mass in Mir Mine is creation of a protective separation layer both in ore body and in enclosing rock mass on the both sides of the ore body at a distance of 15 m. Such destressing measures can allow safe mining of ore reserves using the sublevel stoping method with sublevels to 50 m high. The research findings will be used in the front-end engineering as the basis for the further mine planning and design.

Physical and mechanical properties of placers and rocks in the Rakovsky and Bolotny stream channels in the Vedugin gold occurrence area

2021 ◽  
pp. 94-101
Author(s):  
G. V. Sergeev ◽  
◽  
A. A. Eremenko ◽  
O. M. Usoltseva ◽  
Yu. N. Shaposhnik ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rock Mass ◽  
Ground Surface ◽  
Physical And Mechanical Properties ◽  
Stream Channels ◽  
Support Design ◽  
Rockburst Hazard ◽  
Gold Occurrence ◽  
Mining Safety ◽  
Research Findings

The information on the rock mass behavior in the course of mineral mining is of vital necessity for exploration and mining companies. In engineering decision-making as well as for the prevention of possible difficulties, it is required to have the most comprehensive data on physical and mechanical properties of rock masses. The aim of this study is determination of physical and mechanical properties of placer rocks in the Rakovsky and Bolotny stream channels in the Vedugin gold occurrence area, as well as assessment of elasticity and brittleness of ore and rocks to define their susceptibility to rockbursting. It is found that bedding rocks in Rakovsky and Bolotny placers down to a depth of 87 m below ground surface are rockburst-non-hazardous. The research findings are usable in elaboration of project documentation for mining Rakovsky and Bolotny placers, as well as in selection of technologies for supporting rock mass and for actual mining of placer reserves. In the latter case, it is possible to make reasonable decisions on support design and geotechnology parameters so that to combine mining safety with the quality of mineral extraction as early as the project design. It is recommended that Burkandya company undertakes continuous monitoring and prediction of rockburst hazard as mining is advanced to deeper levels.

scholarly journals Geotechnical Risk Classification for Underground Mines / Klasyfikacja Poziomu Zagrożenia Geotechnicznego W Kopalniach Podziemnych

2015 ◽  
Vol 60 (1) ◽  
pp. 51-61
Author(s):  
Ritesh Kumar Mishra ◽  
Mikael Rinne
Keyword(s):  
Risk Assessment ◽  
Rock Mass ◽  
Underground Mining ◽  
Mining Operation ◽  
Mining Activity ◽  
Mine Planning ◽  
Underground Mines ◽  
Mining Operations ◽  
Prediction And Prevention ◽  
Geotechnical Risk

Abstract Underground mining activities are prone to major hazards largely owing to geotechnical reasons. Mining combined with the confined working space and uncertain geotechnical data leads to hazards having the potential of catastrophic consequences. These incidents have the potential of causing multiple fatalities and large financial damages. Use of formal risk assessment in the past has demonstrated an important role in the prediction and prevention of accidents in risk prone industries such as petroleum, nuclear and aviation. This paper proposes a classification system for underground mining operations based on their geotechnical risk levels. The classification is done based on the type of mining method employed and the rock mass in which it is carried out. Mining methods have been classified in groups which offer similar geotechnical risk. The rock mass classification has been proposed based on bulk rock mass properties which are collected as part of the routine mine planning. This classification has been subdivided for various stages of mine planning to suit the extent of available data. Alpha-numeric coding has been proposed to identify a mining operation based on the competency of rock and risk of geotechnical failures. This alpha numeric coding has been further extended to identify mining activity under ‘Geotechnical Hazard Potential (GHP)’. GHP has been proposed to be used as a preliminary tool of risk assessment and risk ranking for a mining activity. The aim of such classification is to be used as a guideline for the justification of a formal geotechnical risk assessment.

THE IDENTIFICATION OF PARAMETERS OF THEORIES USED FOR PROGNOSES OF POST MINING DEFORMATIONS BY MEANS OF PRESENT SOFTWARE / IDENTYFIKACJA WARTOŚCI PARAMETRÓW TEORII PROGNOZOWANIA WPŁYWÓW PRZY WYKORZYSTANIU WSPÓŁCZESNYCH NARZĘDZI INFORMATYCZNYCH

2013 ◽  
Vol 58 (4) ◽  
pp. 1347-1357 ◽  
Author(s):  
Roman Ścigała
Keyword(s):  
Rock Mass ◽  
Land Surface ◽  
Underground Mining ◽  
Transient State ◽  
Computer Programs ◽  
Asymptotic State ◽  
Software System ◽  
Practical Utilization ◽  
Identification Of Parameters ◽  
Graphical Processing

Abstract The characteristic of specialized computer programs has been presented, serving for identification of W. Budryk-S. Knothe theory parameters, used for description of asymptotic state of post-mining deformations, as well as for transient state. The software is the result of several years of authors’ work. It is a part of complete software system designed for forecasting of underground mining influences on the rock mass and land surface and graphical processing of calculations results. Apart from software description, a short example of its practical utilization has been attached.

scholarly journals Simulation of deposit parameters in underground development mining

2018 ◽  
Vol 60 ◽  
pp. 00029 ◽  
Author(s):  
Vladimir Golik ◽  
Yuriy Razorenov ◽  
Volodymyr Morkun ◽  
Nataliia Morkun
Keyword(s):  
System Analysis ◽  
Physical Simulation ◽  
Underground Mining ◽  
Theory And Practice ◽  
Ore Body ◽  
Advanced Experience ◽  
Modern Development ◽  
Complex Criterion ◽  
Economic Indices ◽  
Equipment Application

The article is aimed at improving development mining to prepare an ore body for stoping by access ramps to provide comfortable conditions and high technical and economic indices in underground mining. Efficient parameters of underground mining are chosen in the course of simulating data on the mining theory and practice considering ore losses and dilution on the basis of critical analysis of uranium mining enterprises’ activities. The research provides data on geological and engineering zoning of an ore deposit and physical-mechanical properties of ore bearing rocks. The advanced experience is systemized and there is provided system analysis of modern development mining schemes with access ramps (ring, spiral, one-way inclined, central inclined and across the strike). The research recommends schemes of development mining and substantiates their advantages. There are quantitative indices of physical simulation of development variants as to drawn ore quality according to criteria of soil location in ore draw points. The scientific novelty implies developing the criterion of optimality and ranking variants of development mining according to technical-economic and geomechanical indices considering some technological factors as well as the number of stopes operating simultaneously on the level. The study consists in increasing authenticity of development projects through applying complex schemes of access ramps according to the complex criterion of increasing mining depths, equipment application, ventilation and underground mine capacity.

scholarly journals MODERNIZATION OF THE MINING SYSTEM OF SMALL DEPOSITS OF RICH COPPER PYRITE ORES

2020 ◽  
Vol 12 (3) ◽  
pp. 444-453
Author(s):  
Igor SOKOLOV ◽  
◽  
Yury ANTIPIN ◽  
Artem ROZHKOV ◽  
◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Rock Mass ◽  
Average Length ◽  
Thickness Variation ◽  
Chamber System ◽  
Mining Operations ◽  
Mining System ◽  
Ore Body ◽  
Experimental Block ◽  
Sublevel Caving

The purpose work. Substantiation and selection of a safe and effective option of mining technology of the experimental block in the pilot industrial mining of the Skalistoe deposit. Method of research. Analysis and synthesis of project solutions, experience in mining inclined low-thickness ore bodies, economic and mathematical modeling and optimization of the parameters of options mining systems in the conditions of the experimental block. Results of research. As a result of research it was established: - the sublevel caving mining system with the parameters adopted in the project does not guarantee the completeness of the extraction of reserves and the effectiveness of mining operations. Project indicators of extraction by sublevel caving technology with frontal ore drawing are overestimated and difficult to achieve in these geological and technical conditions (combination of low thickness and angle of ore body); project scheme for the delivery and transportation of rock mass seems impractical due to the significant volume of heading workings and increased transportation costs; - eight technically rational options of various mining systems were constructed, most relevant to the geological and technical conditions of the deposit. Five variants of the sublevel chamber system and pillar caving, a project variant of sublevel caving technology with frontal ore drawing and two options flat-back cut-and-fill system were considered; - for mining the Skalistoe deposit, according to the results of economic and mathematical modeling, optimal by the criterion of profit per 1 ton of balance reserves of ore is a option of the technology of chamber extraction with dual chambers, frontal drawing of ore by remote-controlled load-haul-dump machine and subsequent pillars caving, as having the greatest profit; - the calculations justified stable spans of dual chambers (25.3 m) and the width of panel pillars (3 m). With an allowable span of 25.3 m, the roof of the dual chambers will be stable with a safety factor of 1.41, and a panel pillar with a width of 3 m has a sufficient margin of safety (more than 1.6) in the whole range of ore body thickness variation; - the proposed scheme of delivery and transportation of rock mass, which allows to reduce the volume of tunnel works by 26% and the average length of transportation by 10-15% compared with the project. Findings. Developed in the process of modernization the technology sublevel chamber system with double-chamber, compared with the project technology, it is possible to significantly increase the efficiency of mining of the low thickness deposit of rich ores Skalistoe by reducing the specific volume of preparatory-rifled work by 34%, the cost of mined ore by 12%, losses and ore dilution – by 2 and 2.9 times, respectively.

scholarly journals Appraising clinical applicability of studies: mapping and synthesis of current frameworks, and proposal of the FrACAS framework and VICORT checklist

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Quoc Dinh Nguyen ◽  
Erica M. Moodie ◽  
Philippe Desmarais ◽  
Robert Goulden ◽  
Marie-France Forget ◽  
...  
Keyword(s):  
Literature Search ◽  
Internal Validity ◽  
Specific Area ◽  
Clinical Perspective ◽  
General Applicability ◽  
Clinical Applicability ◽  
Study Results ◽  
Target User ◽  
Research Findings ◽  
Framework Development

Abstract Background Not all research findings are translated to clinical practice. Reasons for lack of applicability are varied, and multiple frameworks and criteria exist to appraise the general applicability of epidemiological and clinical research. In this two-part study, we identify, map, and synthesize frameworks and criteria; we develop a framework to assist clinicians to appraise applicability specifically from a clinical perspective. Methods We conducted a literature search in PubMed and Embase to identify frameworks appraising applicability of study results. Conceptual thematic analysis was used to synthesize frameworks and criteria. We carried out a framework development process integrating contemporary debates in epidemiology, findings from the literature search and synthesis, iterative pilot-testing, and brainstorming and consensus discussions to propose a concise framework to appraise clinical applicability. Results Of the 4622 references retrieved, we identified 26 unique frameworks featuring 21 criteria. Frameworks and criteria varied by scope and level of aggregation of the evidence appraised, target user, and specific area of applicability (internal validity, clinical applicability, external validity, and system applicability). Our proposed Framework Appraising the Clinical Applicability of Studies (FrACAS) classifies studies in three domains (research, practice informing, and practice changing) by examining six criteria sequentially: Validity, Indication-informativeness, Clinical relevance, Originality, Risk-benefit comprehensiveness, and Transposability (VICORT checklist). Conclusions Existing frameworks to applicability vary by scope, target user, and area of applicability. We introduce FrACAS to specifically assess applicability from a clinical perspective. Our framework can be used as a tool for the design, appraisal, and interpretation of epidemiological and clinical studies.

scholarly journals Automatic Monitoring System Designed for Controlling the Stability of Underground Excavation

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Piotr MAŁKOWSKI ◽  
Zbigniew NIEDBALSKI ◽  
Łukasz BEDNAREK
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Automatic Monitoring ◽  
Mass Movements ◽  
Support Design ◽  
Automatic Monitoring System ◽  
Underground Workings ◽  
The Stability ◽  
Technical Solutions ◽  
The Given

Ensuring the stability of mining excavations is a crucial aspect of underground mining. For thispurpose, appropriate shapes, dimensions, and support of workings are designed for the given mining andgeological conditions. However, for the proper assessment of the adequacy of the used technical solutions,and the calibration of the models used in the support design, it is necessary to monitor the behavior of theexcavation. It should apply to the rock mass and the support. The paper presents the automatic systemdesigned for underground workings monitoring, and the example of its use in the heading. Electronicdevices that measure the rock mass movements in the roof, the load on the standing support, and on bolts,the stress in the rock mass, are connected to the datalogger and can collect data for a long of time withoutany maintenance, also in hard-to-reach places. This feature enables the system to be widely used, inparticular, in excavations in the vicinity of exploitation, goafs, or in the area of a liquidated exploitationfield.

scholarly journals Kedudukan Pejabat Sementara Notaris dalam Hal Notaris Diberhentikan Sementara dari Jabatannya

Acta Comitas ◽  
2021 ◽  
Vol 6 (02) ◽  
pp. 367
Author(s):  
Komang Teja Pradnyana ◽  
I Ketut Mertha
Keyword(s):  
Research Method ◽  
Conceptual Approach ◽  
Construction Technique ◽  
Material Analysis ◽  
Analysis Technique ◽  
System Technique ◽  
Research Findings ◽  
Card System ◽  
Permanent Work

Abstract The purpose of this writing is to determine the ratio legis for the position of Temporary Notary Officer in the event that the Notary is temporarily suspended from his/her position and to understand the reformulation of the regulation of the position of the Notary's Temporary Officer in the event that the Notary is temporarily suspended from his/her position. The research method used is the normative research method, which departs from the absence of norm on the regulation of the position of Temporary Notary Officer in order to carry out the position of a temporarily suspended Notary as stipulated in Article 1 point 2 of the UUJN-Amendment, with a statutory approach and a conceptual approach. The technique of collecting legal material is in the form of card system technique and legal material analysis technique in the form of descriptive technique and construction technique. The research findings are as follows: Ratio Legis for the position of a Notary's Temporary Officer in the event that a Notary is temporarily suspended from his/her position is to maintain the continuity of the Notary's position, even though the Notary (official) cannot carry out his/her duties for a while because of being temporarily suspended, but persist because it is a permanent work sector. Regulatory reformulation of the position of Temporary Notary Officer in the event that the Notary is temporarily suspended from office is by establishing a norm that revises the norm of Article 1 point 2 UUJN-Amendment.   Abstrak Tujuan penulisan ini adalah untuk mengetahui ratio legis kedudukan Pejabat Sementara Notaris dalam hal Notaris diberhentikan sementara dari jabatannya dan memahami reformulasi pengatuan atas kedudukan Pejabat Sementara Notaris dalam hal Notaris diberhentikan sementara dari jabatannya. Metode penelitian yang dipergunakan yaitu metode penelitian normatif, yang beranjak dari kekosongan norma atas pengaturan kedudukan Pejabat Sementara Notaris guna menjalankan jabatan Notaris yang diberhentikan sementara sebagaimana ditentukan dalam Pasal 1 angka 2 UUJN-Perubahan, dengan jenis pendekatan perundang-undangan serta pendekatan konseptual. Teknik pengumpulan bahan hukum berupa teknik sistem kartu dan teknik analisisa bahan hukum berupa teknik deskriptif dan teknik konstruksi. Adapun temuan penelitian adalah sebagai berikut: Ratio legis kedudukan Pejabat Sementara Notaris dalam hal Notaris diberhentikan sementara dari jabatannya adalah untuk mempertahankan keberlangsungan jabatan Notaris itu sendiri, meskipun Notaris (pejabat) tidak dapat melaksanakan tugas jabatannya untuk sementara waktu karena diberhentikan sementara, namun jabatan Notaris harus tetap ada karena merupakan lingkungan pekerjaan tetap. Reformulasi pengaturan atas kedudukan Pejabat Sementara Notaris dalam hal Notaris diberhentikan sementara dari jabatannya adalah dengan pembentukan norma yang merevisi norma Pasal 1 angka 2 UUJN-Perubahan.  

scholarly journals Determination and quality classification of rock mass of the Diatomite mine, Algeria

2021 ◽  
Vol 1 ◽  
pp. 17-24
Author(s):  
Abdessattar LAMAMRA ◽  
◽  
Dmitriy Leonidovich NEGURITSA ◽  
Samir BEDR ◽  
Ariant A. REKA ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rock Mass ◽  
Underground Mining ◽  
Physical And Mechanical Properties ◽  
Friction Angle ◽  
Classification Systems ◽  
Natural Phenomenon ◽  
Underground Structures ◽  
Dilatancy Angle ◽  
Mining Work

Reserch relaevance. Most ground movements are generally due to rock instability, this natural phenomenon poses a risk to humanity. The properties of the rock mass directly influence the type of movement especially in underground structures. Research aim. Our goal is to characterize and classify the rock mass of diatomite from the sig mine using geomechanical classification systems such as the RQD and RMR in order to determine the quality of the rocks in the sig mine Western Algeria from the determination of the physical and mechanical properties. Methodology. In this article, the characterization analysis of the diatomite rock mass of the sig mine was carried out. First, determinations of the physical properties and carried out the triaxial test to determine the mechanical properties (young’s modulus, the friction angle, the dilatancy angle, the cohesion, the poisson’s ratio). Secondly to classify the deposit and give a recommendation to avoid stability problems. Research results. The results from physical and mechanical analyzes, it can be said that the nature of the rock present in the diatomite (underground mine) does not have enough resistance. Conclusion. Our study definitively proves that the rock mass of sig diatomite is of very low quality and it will be very dangerous for the underground mining work of the mine especially in places where the mineralized layer is very deep. And we suggest to replace the mining technique room and pillar currently used in the diatomite mine and put another mining method which includes roof support system to ensure the safety both of the miners and the equipment.

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