Classification of protective pillars toward higher safety and innovation in room-and-pillar coal mining

2020 ◽  
pp. 27-24
Author(s):  
S. A. Prokopenko ◽  
◽  
V. V. Sementsov ◽  
M. S. Dobrovolsky ◽  
E. V. Nifanov ◽  
...  
Keyword(s):  
Coal Mining ◽  
Coal Production ◽  
Room And Pillar Mining ◽  
Geological Conditions ◽  
Pillar Mining

During room-and-pillar mining, protective pillars of coal are usually left standing. The protective pillars differ in shape, size, process properties and extractability ratios of coal. The authors propose a classification of the protective pillars with respect to their structure and shape in order to estimate and predict their properties. The extractability ratios of coal are calculated for the initial rib pillars and panels at different final shapes of protective pillars. The protective pillars are ranked with respects to the coal extractability ratios. Such systematization of pillars enables selecting the best engineering solutions and innovative improvement of room-and-pillar mining in specific geological conditions toward enhanced safety and efficiency of underground coal production. The article is prepared in the framework of the Competitiveness Enhancement Program of the Tomsk Polytechnic University.

scholarly journals MINING BLOCK STABILITY PREDICTION BY THE MONTE CARLO METHOD

2006 ◽  
Vol 1 ◽  
pp. 185
Author(s):  
O. Nikitin
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Oil Shale ◽  
Ground Surface ◽  
Mining System ◽  
Room And Pillar Mining ◽  
The Monte Carlo Method ◽  
Geological Conditions ◽  
Pillar Mining ◽  
Failure Prognosis

This paper analyses the stability of the mining blocks by the Monte Carlo method in Estonian oil shale mines, where the room-and-pillar mining system is used. The pillars are arranged in a singular grid. The oil shale bed is embedded at the depth of 40-75 m. The processes in overburden rocks and pillars have caused the subsidence of the ground surface. Visual Basic for Application was used for the modeling. Through Monte Carlo simulation, room-and-pillar stable parameters can be calculated. Model allows determination of the probability of spontaneous collapse of the pillars and surface subsidence by the parameters of registered collapsed mining blocks. Proposed method suits as an express-method for stability analysis and failure prognosis. It is applicable in different geological conditions, where the room-and-pillar mining system is used.

scholarly journals Novel Segmented Roadside Plugging-Filling Mining Method and Overlying Rock Mechanical Mechanism Analyses

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2073 ◽  
Author(s):  
Wenqiang Mu ◽  
Lianchong Li ◽  
Zhongping Guo ◽  
Zhaowen Du ◽  
Sixu Wang
Keyword(s):  
Coal Mining ◽  
Surrounding Rock ◽  
Equivalent Model ◽  
Mine Pressure ◽  
Mining Method ◽  
Operation Process ◽  
Geological Conditions ◽  
Pillar Mining ◽  
The Stability ◽  
Site Test

The no-pillar mining method is widely used in coal mining engineering because of its superiority in resolving mine pressure hazards and protecting natural resources. In view of the geological conditions of stable strata in a coal mine of the Shandong Coal Zone, a novel segmented roadside plugging-filling mining method is proposed by introducing the filling coefficient into roadside filling. The operation process is designed with a new grouting filling forming device. Based on the relationship between the theoretical deflection of a cantilever beam and geometric settlement and parallel settlement models, strength formulas applicable to the segmented roadside plugging-filling (SRPF) method at different migration stages are obtained, and the deformation formulas of a roadway toward a rock slab are solved by an elastic equivalent model. Further, the determination procedure of the filling mode under the mining method is clarified. The SRPF method was implemented on a test stope, and the test results indicated that the theoretical deformation produced by the SRPF method was small and can meet the mining requirements. Through on-site test monitoring, the deformation of surrounding rock was 0–160 mm and the filling body under the SRPF method could maintain its own strength and the stability of the surrounding rock. In addition, entire successful mining been completed in the working stope, which further proves the applicability of this method. The backfilling cost of the gob-side filling was reduced by approximately 50%, and the backfilling efficiency was improved in the mine. The description of the novel mining method may provide theoretical and practical guidance for coal mining in similar geological conditions.

EXPERIENCE OF IMPROVING COAL MINING RECOVERY FACTOR IN ROOM-AND-PILLAR MINING SYSTEM

Ugol ◽  
2018 ◽  
pp. 55-59
Author(s):  
A.V. Aikin ◽  
◽  
I.P. Trandin ◽  
A.S. Pozolotin ◽  
M.V. Lysenko ◽  
...  
Keyword(s):  
Coal Mining ◽  
Recovery Factor ◽  
Mining System ◽  
Room And Pillar Mining ◽  
Pillar Mining

Chances and Threats of Hard Coal Mining Development in Poland – The Results of Experts Research/Szanse I Zagrożenia Dla Rozwoju Górnictwa Węgla Kamiennego W Polsce – Wyniki Badań Eksperckich

2014 ◽  
Vol 59 (2) ◽  
pp. 395-411 ◽  
Author(s):  
Józef Dubiński ◽  
Marian Turek
Keyword(s):  
Coal Mining ◽  
Present Situation ◽  
Hard Coal ◽  
Coal Production ◽  
Actual Situation ◽  
Mining Sector ◽  
Energy Carriers ◽  
Hard Coal Mining ◽  
Adverse Influence ◽  
Other World

Abstract The actual situation of hard coal mining in Poland has been presented. In particular, these factors, which have impact on the competiveness of mining sector were highlighted and need of its improving has been stressed. Outlining present situation of hard coal mining an attention was paid to its specific threats. The primary analytical material is based on the results of questionnaire conducted among 92 specialists and experts from the mining sector. The questions were related to chances and threats for development of hard coal mining in Poland. The factors determining them were grouped in such domains as economy, technology, geology, social and law aspects. Moreover, the special attention was paid to the problem of increasing and high costs of coal production which constitute significant threat for the financial and economic situation of the mining enterprises. Also the adverse influence of these high cost on the competitiveness of Polish hard coal with other world producers and with other energy carriers was emphasized. The conclusions summarize the achieved results of analysis.

ENVIRONMENTAL IMPACT OF COAL MINING

2020 ◽  
Author(s):  
Наталья Алексеевна Бойко ◽  
Наталья Владимировна Ромашева
Keyword(s):  
Environmental Impact ◽  
Organizational Structure ◽  
Coal Mining ◽  
Negative Impact ◽  
Coal Industry ◽  
Coal Production ◽  
Atmospheric Air

Представлена характеристика угольной отрасли России по таким направлениям как организационная структура, объем и регионы добычи, потребители угля. Выявлены положительные тенденции, определены проблемы в развитии угольной промышленности. Исследованы негативное воздействие угольного производство на такие компоненты окружающей среды, как атмосферный воздух, водные ресурсы, земная поверхность. The characteristic of the Russian coal industry in such areas as the organizational structure, volume and regions of production, coal consumers has been presented. Positive trends and problems in the development of the coal industry have been identified. The negative impact of coal production on environmental components such as atmospheric air, water, the earth’s surface has been investigated.

Classification of Mason’s Skills by Analysis of Selected Churches of the Broumov Group

2021 ◽  
Vol 109 ◽  
pp. 15-20
Author(s):  
Pavel Kuklík ◽  
Martin Valek ◽  
Charalampos Paschopoulos
Keyword(s):  
Cultural Heritage ◽  
Bearing Capacity ◽  
Construction Industry ◽  
Economic Situation ◽  
Historical Events ◽  
Baroque Architecture ◽  
Current State ◽  
Geological Conditions ◽  
Local Construction

The churches of the Broumov region are renowned for their unique baroque architecture, their distinct shapes, and sizes. They are an integral part of the Czech cultural heritage. If you analyze the churches, it becomes evident that both the local geological conditions and the municipal economic situation have played an important role in their current condition. Moreover, the local construction industry has been significantly affected by historical events. In this article we would like to present the effects of those factors on the current state of selected churches, namely on the bearing capacity of their walls. Besides being very interesting, it also plays a key role in the maintenance and the potential reconstruction of the churches.

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