scholarly journals Monitoring of the stability of underground workings in Polish copper mines conditions

2018 ◽  
Vol 29 ◽  
pp. 00008 ◽  
Author(s):  
Krzysztof Fuławka ◽  
Piotr Mertuszka ◽  
Witold Pytel
Keyword(s):  
Fall Prevention ◽  
Underground Mines ◽  
Observation Methods ◽  
Number Of Factors ◽  
Copper Mines ◽  
Sudden Release ◽  
Roof Falls ◽  
Underground Workings ◽  
The Stability ◽  
Roof Strata

One of the problems associated with the excavation of deposit in underground mines is the local disturbance in a state of unstable equilibrium results in the sudden release of energy, mainly in the form of roof falls. The scale and intensity of this type of events depends on a number of factors. To minimize the risk of instability occurrence, continuous observations of the roof strata condition are recommended. Different roof strata observation methods used in the Polish copper mines have been analysed within the framework of presented paper. In addition, selected prospective methods, which could significantly increase efficiency of rock fall prevention are presented.

scholarly journals Study on the Deformation Mechanism of Soft Rock Roadway under Blasting Disturbance in Baoguo Iron Mine

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Hong-di Jing ◽  
Yuan-hui Li ◽  
Kun-meng Li
Keyword(s):  
Rock Mass ◽  
Deformation Mechanism ◽  
Soft Rock ◽  
Deformation Monitoring ◽  
Underground Mines ◽  
Blasting Vibration ◽  
Iron Mine ◽  
The Stability ◽  
Soft Rock Roadway ◽  
Rock Roadway

In order to study the deformation mechanism of soft rock roadway in underground mines, it is necessary not only to study the influence of the dynamic disturbance caused by the cyclic mining blasting vibration on the stability of the soft rock roadway but also to study the degradation of the roadway surrounding rock itself and other factors. The paper presented a synthetic research system to investigate the factors that influence roadway rock structure deterioration in Baoguo Iron Mine. Firstly, the stability of rock mass was analyzed from the perspective of the physical and structural characteristics of the rock mass. Afterwards, according to monitoring data of mining blasting vibration, a suitable safety blasting prediction model for Baoguo Iron Mine was determined. And then, combining the results of mining blasting vibration monitoring and deformation monitoring, the effect of cyclic mining blasting on the stability of the soft rock roadway was obtained. By systematically studying the intrinsic factors of rock quality degradation and external environmental disturbances and their interactions, this paper comprehensively explores the deformation mechanism of soft rock roadway and provides the support for fundamentally solving the large deformation problems of soft rock roadway in underground mines.

Evaluation of the Effect of Fault on the Stability of Underground Workings of Coal Mine through DEM and Statistical Analysis

2018 ◽  
Vol 92 (6) ◽  
pp. 732-742 ◽  
Author(s):  
Arka Jyoti Das ◽  
Prabhat Kumar Mandal ◽  
Satya Prakash Sahu ◽  
Angad Kushwaha ◽  
Rana Bhattacharjee ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Coal Mine ◽  
Underground Workings ◽  
The Stability

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.

Prospects for the development of underground ore mining geotechnologies at the Talnakh and Oktyabrskoye deep mines

2021 ◽  
pp. 70-75
Author(s):  
I.I. Aynbinder ◽  
P.G. Patskevich ◽  
O.V. Ovcharenko
Keyword(s):  
High Capacity ◽  
Underground Mines ◽  
Total Production ◽  
Stress Concentrations ◽  
Mining System ◽  
Sulphide Ore ◽  
Rock Mass Deformation ◽  
The Rich ◽  
Context Mining ◽  
The Stability

Rich sulphide, cuprous and impregnated ores are currently mined in the underground mines of the Talnakh and Oktyabrskoye deposits at the depths from 250 to 1,700 m. The reserves of rich ores are depleted, and therefore the growth of cuprous and impregnated ores is gaining importance. Their share may reach 80% of the total production by 2030. A distinctive feature of such deposits is the occurrence of cuprous and impregnated ores above the rich sulphide ore, which reserves have been mined out using mining systems with curing backfill mixtures. In this context, mining of impregnated ores will be done in the undermined zones, which will lead to significant rock mass deformation, opening of existing natural and formation of new cracks, will affect the stability of mining structures and will require special measures to control rock pressure in the mines. The paper presents the results of assessing the stress-and-strain condition of the undermined mass of impregnated ores mined using the room-and-pillar cut-and-fill method at the depths of 500, 1000 and 2000 m. The assessment shows that no dangerous stress concentrations arise in the mining structures at great depths which creates preconditions for the safe development of such deposits. A significant increase in ore extraction will require upgrading of existing underground facilities. It is proposed to carry out pre-concentration of the mined ore in the underground conditions using modern crushing complexes, high-capacity mine separators to remove waste rock, which can subsequently be used as the backfill material. In this way, a closed-loop mining system is created that meets the efficiency requirements of mining production and integrated subsoil development.

Predicting the stability of the mined-ore quality when planning underground mines

1978 ◽  
Vol 14 (4) ◽  
pp. 389-393
Author(s):  
M. D. Fugzan ◽  
D. R. Kaplunov ◽  
I. A. Manilov
Keyword(s):  
Underground Mines ◽  
The Stability

Advances in Ambient Temperature Creep Deformation Behavior of Two-Phase Titanium Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 779-784 ◽  
Author(s):  
A. Jaworski ◽  
Sreeramamurthy Ankem
Keyword(s):  
Titanium Alloys ◽  
Creep Deformation ◽  
Deformation Behavior ◽  
Creep Resistance ◽  
Volume Fraction ◽  
Beta Phase ◽  
Two Phase ◽  
Number Of Factors ◽  
Strength Difference ◽  
The Stability

In recent years, significant advances have been made in regard to the creep deformation behavior of two phase titanium alloys. It has been shown that the creep resistance depends on a number of factors, including the shape of the component phases, the strength difference between the phases, and the stability of the beta phase. For example, in two-phase materials with a similar volume fraction and morphology of phases, if the beta phase is less stable, then the creep resistance is lower. These developments will be reviewed and the reasons for such effects will be suggested.

Reliability in the structure of professional and personal qualities of a specialist of the Ministry of Emergencies of Russia

2020 ◽  
pp. 7-17
Author(s):  
Stanislav N. Savinkov ◽  
Nina A. Koval
Keyword(s):  
Scientific Development ◽  
Professional Activity ◽  
Special Importance ◽  
Factors Affecting ◽  
Training Support ◽  
Number Of Factors ◽  
Moral Qualities ◽  
Personal Qualities ◽  
The Stability ◽  
Pedagogical Literature

In the modern conditions of fulfilling professional duties, the issue of studying the personal and professional qualities of specialists of the Ministry of Emergencies of Russia has a special importance. Today, issues related to the study of the specifics of the professional qualities of specialists of the Ministry of Emergencies of Russia within the framework of scientific issues of modern psychology are of increasing importance. This is due to a number of factors, both the need for a deeper study of the principles of the formation of special skills and abilities, professionally important personal qualities of specialists of the Ministry of Emergencies of Russia, and insufficient scientific development, which puts these issues among the most relevant. We carried out analytical understanding of psychological and pedagogical literature on the topic. The theoretical and methodological analysis of the reliability problem indicates that it is not considered as an independent problem and is not established in the traditionally existing systems of selection, training, support of specialists. We considered the structure of reliability in the context of professional and personal qualities of specialists of the Ministry of Emergencies of Russia working in conditions involving danger to life. We gave an analysis of factors affecting the professional and personal reliability of a specialist of the Russian Emergencies Ministry. Personal and professional reliability of a specialist of the Ministry of Emergencies of Russia is a characteristic of personal features and qualities that determine the stability of reference normative behavior by indicators of personal reliability in professional activity. At the same time, another important parameter of personal-professional reliability is the moral and moral qualities of the specialist, his spiritual and moral maturity. We presented the results of research on the study of personal and professional qualities conducted with specialists of the Ministry of Emergencies of Russia.

scholarly journals Assessing the Structure of the Ways of Coping Questionnaire in Fibromyalgia Patients Using Common Factor Analytic Approaches

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Charles Van Liew ◽  
Maya S. Santoro ◽  
Larissa Edwards ◽  
Jeremy Kang ◽  
Terry A. Cronan
Keyword(s):  
Visual Analysis ◽  
Common Factor ◽  
Ways Of Coping ◽  
Ways Of Coping Questionnaire ◽  
Number Of Factors ◽  
Oblimin Rotation ◽  
The Stability ◽  
Context Specific ◽  
Study Participants ◽  
Variance Explained

The Ways of Coping Questionnaire (WCQ) is a widely used measure of coping processes. Despite its use in a variety of populations, there has been concern about the stability and structure of the WCQ across different populations. This study examines the factor structure of the WCQ in a large sample of individuals diagnosed with fibromyalgia. The participants were 501 adults (478 women) who were part of a larger intervention study. Participants completed the WCQ at their 6-month assessment. Foundational factoring approaches were performed on the data (i.e., maximum likelihood factoring [MLF], iterative principal factoring [IPF], principal axis factoring (PAF), and principal components factoring [PCF]) with oblique oblimin rotation. Various criteria were evaluated to determine the number of factors to be extracted, including Kaiser’s rule, Scree plot visual analysis, 5 and 10% unique variance explained, 70 and 80% communal variance explained, and Horn’s parallel analysis (PA). It was concluded that the 4-factor PAF solution was the preferable solution, based on PA extraction and the fact that this solution minimizes nonvocality and multivocality. The present study highlights the need for more research focused on defining the limits of the WCQ and the degree to which population-specific and context-specific subscale adjustments are needed.

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