Investigation into the influence of air-decking on blast performance in opencast mines in India: A study

2012 ◽  
pp. 121-126
Keyword(s):  
Opencast Mines ◽  
Blast Performance

Modeling of Near-Field Blast Performance

2013 ◽  
Author(s):  
Barrie E. Homan ◽  
Matthew M. Biss ◽  
Kevin L. McNesby
Keyword(s):  
Near Field ◽  
Blast Performance

scholarly journals The Influence of Opencast Lignite Mining Dehydration on Plant Production—A Methodological Study

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1917
Author(s):  
Benedykt Pepliński ◽  
Wawrzyniec Czubak
Keyword(s):  
Brown Coal ◽  
Crop Production ◽  
Plant Production ◽  
External Costs ◽  
Opencast Mines ◽  
Temporal And Spatial ◽  
Potato Yields ◽  
Burning Coal ◽  
Depression Cone ◽  
The Cost

In many circles, brown coal continues to be viewed as a cheap source of energy, resulting in numerous investments in new opencast brown coal mines. Such a perception of brown coal energy is only possible if the external costs associated with mining and burning coal are not considered. In past studies, external cost analysis has focused on the external costs of coal burning and associated emissions. This paper focuses on the extraction phase and assesses the external costs to agriculture associated with the resulting depression cone. This paper discusses the difficulties researchers face in estimating agricultural losses resulting from the development of a depression cone due to opencast mineral extraction. In the case of brown coal, the impacts are of a geological, natural-climatic, agricultural-productive, temporal, and spatial nature and result from a multiplicity of interacting factors. Then, a methodology for counting external costs in crop production was proposed. The next section estimates the external costs of crop production arising from the operation of opencast mines in the Konin-Turek brown coal field, which is located in central Poland. The analyses conducted showed a large decrease in grain and potato yields and no effect of the depression cone on sugar beet levels. Including the estimated external costs in the cost of producing electricity from mined brown coal would significantly worsen the profitability of that production.

Numerical investigation on the dynamic response of foam-filled corrugated core sandwich panels subjected to air blast loading

2017 ◽  
Vol 21 (3) ◽  
pp. 838-864 ◽  
Author(s):  
Yuansheng Cheng ◽  
Tianyu Zhou ◽  
Hao Wang ◽  
Yong Li ◽  
Jun Liu ◽  
...  
Keyword(s):  
Total Energy ◽  
Energy Absorption ◽  
Sandwich Panels ◽  
Blast Loading ◽  
Front Face ◽  
Back Side ◽  
Air Blast ◽  
Foam Filled ◽  
Blast Performance ◽  
Air Blast Loading

The ANSYS/Autodyn software was employed to investigate the dynamic responses of foam-filled corrugated core sandwich panels under air blast loading. The panels were assembled from metallic face sheets and corrugated webs, and PVC foam inserts with different filling strategies. To calibrate the proposed numerical model, the simulation results were compared with experimental data reported previously. The response of the panels was also compared with that of the empty (unfilled) sandwich panels. Numerical results show that the fluid–structure interaction effect was dominated by front face regardless of the foam fillers. Foam filling would reduce the level of deformation/failure of front face, but did not always decrease the one of back face. It is found that the blast performance in terms of the plastic deflections of the face sheets can be sorted as the following sequence: fully filled hybrid panel, front side filled hybrid panel, back side filled hybrid panel, and the empty sandwich panel. Investigation into energy absorption characteristic revealed that the front face and core web provided the most contribution on total energy absorption. A reverse order of panels was obtained when the maximization of total energy dissipation was used as the criteria of blast performance.

Mesh area vis-à-vis blast performance in a limestonequarry of the Philippines

Fragblast ◽  
2005 ◽  
Vol 9 (4) ◽  
pp. 219-232 ◽  
Author(s):  
P. Rai ◽  
F. L. Imperial
Keyword(s):  
The Philippines ◽  
Blast Performance

Blast performance of RC panels with waste steel fibers

2015 ◽  
Vol 94 ◽  
pp. 536-546 ◽  
Author(s):  
Marek Foglar ◽  
Radek Hajek ◽  
Martin Kovar ◽  
Jiří Štoller
Keyword(s):  
Steel Fibers ◽  
Blast Performance

scholarly journals A study of vibration exposure and work practices of Loader and Dozer operators in opencast mines

2012 ◽  
Vol 2 (2) ◽  
pp. 3-7 ◽  
Author(s):  
Bibhuti Bhusan Mandal ◽  
Krishnendu Sarkar ◽  
Veena Manwar
Keyword(s):  
Health Risk ◽  
Occupational Safety ◽  
Vertical Direction ◽  
Control Measures ◽  
Whole Body ◽  
Reverse Direction ◽  
Work Practices ◽  
Continuous Change ◽  
Background Exposure ◽  
Opencast Mines

Background: Exposure to whole body vibration (WBV) at work and development of musculoskeletal disorders are well linked. Vehicle vibrations are usually perceived to occur in vertical direction and are likely to cause lumbar disorders in operators. Vibration characteristics of the machines need to be studied and compared with work practices which may indicate nature of health risk to operators. This may help in developing specific action plans to control vibration related health risk. Objective: The objectives of the study were, to measure and analyze vibration magnitudes, observe work practices of Loaders and Dozers, evaluate health risk to their operators and to formulate recommendations for control measures. Methods and Material: Frequency weighted Root Mean Square values of acceleration data was collected as per guidelines in ISO 2631-1:1997 using human vibration analyzers. WBV exposure of 40 (Forty) Loader and Dozer operators in eight opencast mines were evaluated to assess health risk using vibration magnitude and corresponding daily exposure durations. Results and Conclusion: The dominant axis of vibration in dozers was found to be X (front to back) in 80% of the equipments. This is different from transporting equipment like Dumpers which have Z axis as dominant axis of vibration. A continuous change of movement in forward and reverse direction and rash driving were found to be contributory factors for increased vibration intensity along X- axis. It was observed that 27(68%) of them showed moderate whereas 12(30%) equipment showed high health risk. It is suggested that vibration control measures should be designed and adopted based not only on the intensity but also on the dominant axis typical to the equipment and work practices.DOI: http://dx.doi.org/10.3126/ijosh.v2i2.6144 International Journal of Occupational Safety and Health, Vol 2. No 2 (2012) 3-7 

Metalliferous potential of the United Kingdom

1974 ◽  
Vol 339 (1618) ◽  
pp. 289-297 ◽  
Keyword(s):  
United Kingdom ◽  
Mechanical Equipment ◽  
Potential Production ◽  
Ore Deposit ◽  
The United Kingdom ◽  
Future Production ◽  
Ore Bodies ◽  
Vein Type ◽  
Opencast Mines ◽  
Vein Deposits

The total estimated value of past non-ferrous metalliferous production, as well as that of fluorspar, barytes and witherite, in the United Kingdom, as a whole, is £5.95 x 10 9 at assumed average 1973 metal and mineral prices. Southwest England produced roughly 70% of this value. The outlook for future production appears to be best in Wales and Scotland. At least one large unmined ore deposit of disseminated type is known, although vein-type ore bodies are more likely to be found. The effects of the development of high-tonnage mechanical equipment favour opencast mines and imply that vein deposits must be rich in order to compete economically. The estimated value of potential production from England and Wales is put in the range of £6.3 x 10 8 to £1.3 x 10 9 at assumed average 1973 prices. No quantified estimate is considered possible for Scotland.

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