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Abstract

As one of the most important decision-making problems in fully mechanised mining, the corresponding mining technology pattern is the technical foundation of the working face. Characterised by complexity in a thin seam fully mechanised mining system, there are different kinds of patterns. In this paper, the classification strategy of the patterns in China is put forward. Moreover, the corresponding theoretical model using neural networks applied for patterns decision-making is designed. Based on the above, optimal selection of these patterns under given conditions is achieved. Lastly, the phased implementation plan for automatic mining pattern is designed. As a result of the industrial test, automatic mining for panel 22204 in Guoerzhuang Coal Mine is realised.
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Bibliography

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[17] Daming Yang, Bingjing Li. The Main Adjustment of New Version China’s “Coal Mine Safety Regulations”. International Journal of Oil, Gas and Coal Engineering 7 (2) (2019). DOI: https://doi.org/10.11648/j.ogce.20190702.14
[18] Liu Shouqiang, Wu Qiang, Zeng Yifan. Analysis of revision points of detailed rules for water prevention and control in coal mines. Coal Engineering 51 (03), 1-4 (2019). DOI: https://doi.org/10.11799/ce201903001
[19] R.U. Bilsel, G. Büyüközkan, D. Ruan, A fuzzy preference‐ranking model for a quality evaluation of hospital web sites. International Journal of Intelligent Systems 21 (11), 1181-1197 (2006). DOI : https://doi.org/10.1002/int.20177
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[21] Yang Qian, Improvement of BP neural network prediction method and its application in long-term settlement prediction of tunnels. Journal of Beijing University of Technology. (01), 92-97 (2011). DOI: CNKI: SUN: BJGD.0.2011-01-016
[22] K. Saito, R. Nakano, Extracting regression rules from neural networks. Neural Networks 15 (PII S0893- 6080(02)00089-810), 1279-1288 (2002). DOI: https://doi.org/10.1016/S0893-6080(02)00089-8
[23] Zhang Dongsheng, Zhang Jixiong, Zhang Xianchen, Fuzzy comprehensive evaluation of mining process conditions of coal seam geological conditions in working face. Journal of Systems Engineering (03), 252-256 (2002). DOI: https://doi.org/10.3969/j.issn.1000-5781.2002.03.011
[24] Zhang Lijun, Zhang Le, Comprehensive Evaluation of Adaptability of Thin Coal Seam Fully Mechanized Mining Technology. Coal Science and Technology (06), 43-45 (2006). DOI: https://doi.org/10.13199/j.cst.2006.06.53.zhanglj.016
[25] C. Wang, S. Tian, Evolving Neural Network Using Genetic Algorithm for Prediction of Longwall Mining Method in Thin Coal Seam Working Face. International Journal of Mining and Mineral Engineering 9 (3), 228-239 (2018). DOI: https://doi.org/10.1504/IJMME.2018.096121
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Authors and Affiliations

Chen Wang
1 2
ORCID: ORCID
Yu Zhang
1
ORCID: ORCID
Yong Liu
1
ORCID: ORCID
Chengyu Jiang
1
ORCID: ORCID
Mingqing Zhang
1
ORCID: ORCID

  1. Guizhou University, Mining College, Guiyang 550025, China
  2. Chongqing Energy Investment Group Science & Technology co., LTD, Chongqing 400060, China
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Abstract

In drill and blast tunneling method (D&B), non-electric detonators are the most commonly used initiation system. The constant development of excavation technology provides advanced tools for achieving better results of excavation. The research presented in this paper was focused on the attempt to evaluate the influence of electronic detonators, which nowadays are unconventional in tunnelling engineering, on the quality of the excavated tunnel contour. Based on the data form Bjørnegård tunnel in Sandvika, where electronic detonators were tested in five blasting rounds, detailed analysis of drilling was performed. The analysis was made based on the data from laser scanning of the tunnel. 103 profile scans were used for the analysis: 68 from non-electric detonators and 35 from electronic detonators rounds. The results analyzed in terms of contour quality showed that comparing to the results from rounds blasted with non-electric detonators, there was not significant improvement of the contour quality in rounds with electronic detonators.
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Authors and Affiliations

Anna Monika Skłodowska
1 2
ORCID: ORCID
Monika Mitew-Czajewska
1
ORCID: ORCID

  1. Warsaw University of Technology, Faculty of Civil Engineering, Al. Armii Ludowej 16, 00-637 Warsaw, Poland
  2. Now at: Instituto Nazionale di Oceanografia e di Geofisica Sperimentale – OGS, Borgo Grotta Gigante 42/C - 34010 - Sgonico, Italy & University of Trieste, Piazzale Europa 1, Trieste, Italy
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Abstract

In many practical situations fluids are normally blended with additives (viscosity index improvers, viscosity thickeners, viscosity thinners) due to which they show pseudoplastic and dilatant nature which can be modelled as cubic stress model (Rabinowitsch model). The cubic stress model for pseudoplastic fluids is adopted because Wada and Hayashi have shown that the theoretical results with this model are in good agreement with the experimental results. The present theoretical analysis is to investigate the pseudoplastic effect along with the effect of rotational inertia on the pressure distribution, frictional torque and fluid flow rate of externally pressurised flow in narrow clearance between two curvilinear surfaces of revolution. The expression for pressure has been derived using energy integral approach. To analyse and discuss the effects of pseudoplasticity and fluid inertia on the pressure distribution, fluid flow rate and frictional torque, the examples of externally pressurised flow in the clearance between parallel disks and concentric spherical surfaces have been considered.

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Authors and Affiliations

Udaya Singh
Ram Gupta
Vijay Kapur
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Abstract

This article analyses the conditions affecting the incoming global solar radiation in Hornsund (Spitsbergen) in spring of 2015. Incoming solar radiation turned out to be average for the season under analysis, as compared with longer-term data. The clearness index (KT) was 0.46, and was mainly determined by the extent of cloudiness. As a result of differences in the length of day, sunshine duration in May was greater than in April. Incoming solar radiation to the earth's surface is also affected by the atmospheric optical properties. The average value of aerosol optical depth (AOD) at 500 nm in Hornsund in spring of 2015 was 0.087. In the analysed period, increased values of AOD at 500 nm (up to 0.143) were observed, although these are not record values. Over April and May, the greatest part of optical depth was comprised of anthropogenic aerosols (41%), followed by marine aerosols (26%), desert dust (21%) and biomass-burning aerosols (12%). This indicates the significant role of the anthropogenic factor in the climatic conditions of Spitsbergen.
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Authors and Affiliations

Joanna Uscka-Kowalkowska
Rajmund Przybylak
Krzysztof M. Markowicz
Andrzej Araźny

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