scholarly journals Analysis of the Coal and Gas Outburst Mechanism from the Perspective of Tectonic Movement

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Qingyi Tu ◽  
Yuanping Cheng ◽  
Sheng Xue ◽  
Ting Ren ◽  
Xiang Cheng
Keyword(s):  
Tectonic Stress ◽  
Coal And Gas Outburst ◽  
Future Research ◽  
Tectonic Movement ◽  
Gas Outburst ◽  
Research Areas ◽  
Dynamic Factors ◽  
Restructuring Process ◽  
Geological Factors ◽  
Inducing Factors

Coal and gas outburst is the extreme instability caused by stress, gas, and coal. In this review article, dominant factors and inducing factors of outburst were summarized; geologic features of typical outburst cases and the effects of tectonic movement on outbursts were analyzed; the outburst stages with considerations to geologic factors were divided. It was found that inducing factors, including buried depth, tectonic movement, gas composition, coal seam conditions, overlying/underlying rock conditions, and mining mode, control the outburst by influencing the dominant factors (stress, gas, and coal). Among them, tectonic movement is the key of outburst. Influenced by tectonic movement, the primary structure of coals is damaged/pulverized due to the tectonic stress and unique tectonic mode, resulting in the formation of tectonic coals. When external dynamic factors are changed, tectonic coals are crucial to outburst control for its evolution of porous structure as well as the unique mechanical behaviors and gas flowing responses. Besides, the preparation stage of outburst includes the tectonic process and mining process. The former one refers to the restructuring process of the original coal-bearing strata by tectonic movement, while the mining process is the prerequisite of outburst and it refers to the disturbance of human mining activities to the initial coal seams. It is suggested that more work is required on geological factors of outburst, and a few research areas are proposed for future research.

Application of Radar Velocity Tomography for Detecting Coal and Gas Outburst in Deep Coal Mining

2014 ◽  
Vol 513-517 ◽  
pp. 3659-3662
Author(s):  
Cui Du ◽  
Xin Jun Xu ◽  
Xing Yu Li
Keyword(s):  
Geophysical Methods ◽  
Coal And Gas Outburst ◽  
Mine Safety ◽  
Gas Outburst ◽  
Safety Production ◽  
Geological Factors ◽  
Radar Velocity ◽  
Mining Coal ◽  
Ground Penetrating ◽  
Velocity Tomography

Among the main geological factors to cause the disasters of mine safety production in deep mining, coal and gas outburst is the first major calamity that restricts colliery exploiting. Aiming at this problem, current geophysical methods were reviewed and compared, and the velocity tomography technology using ground penetrating radar was studied. Two models with ground stress anomaly and collapse columns were built and inverted using LSQR algorithm, respectively. The results show that the proposed method gives very consistent results with respect to the models information, and uncertain features of inverted models were identified accurately. This verified radar velocity tomography is effective and practical.

Research on the Mechanism of Tectonic Stress Field Evolution for Coal and Gas Outburst

2013 ◽  
Vol 325-326 ◽  
pp. 1352-1356 ◽  
Author(s):  
Wei Hua Song ◽  
Hong Wei Zhang
Keyword(s):  
Stress Field ◽  
Regional Distribution ◽  
Storage Condition ◽  
Gas Storage ◽  
Tectonic Stress ◽  
Coal And Gas Outburst ◽  
Tectonic Stress Field ◽  
Gas Outburst ◽  
Regional Tectonic ◽  
Coal And Gas Outbursts

The geological characteristics of Pingdingshan mining area in China is fault block uplift and the depression in all around. The faults in the region are dominated by NW trending faults. Our researches show that most of faults experience different mechanics process and movement character because of the evolution of tectonic stress field. The regional distribution of coal and gas outburst is consequent on the regional distribution of regional tectonic stress, tectonic coal and gas storage. At the action of SW-NE extrusion stress by the effect of Qinling orogeny belt, the NWW strike structure and the NNE composite tectonics are prone to occur coal and gas outburst because of concentrated stress, low penetrability and good gas storage condition. Also incorporated with in situ stress measurements and the numerical simulation of regional tectonic stress field by using self-developed Rock Mass Stress-state Analysis System software, the mechanism of the tectonic stress field on coal and gas outbursts is analyzed. The results indicate that the distribution of rock stress depends upon the faults and is formed again because of superposition of the action of faults. Tectonic stress field and its uneven distribution provide dynamic conditions for the occurrence of coal and gas outbursts.

A Review of Minimum Quantity Lubrication (MQL) based on Bibliometry

2020 ◽  
Vol 13 ◽  
Author(s):  
Gaurav Gaurav ◽  
Abhay Sharma ◽  
G S Dangayach ◽  
M L Meena
Keyword(s):  
Descriptive Analysis ◽  
Minimum Quantity Lubrication ◽  
Citation Network ◽  
Machining Process ◽  
Cutting Fluid ◽  
Future Research ◽  
Research Directions ◽  
Minimum Quantity ◽  
Research Areas ◽  
Future Research Directions

Background: Minimum quantity lubrication (MQL) is one of the most promising machining techniques that can yield a reduction in consumption of cutting fluid more than 90 % while ensuring the surface quality and tool life. The significance of the MQL in machining makes it imperative to consolidate and analyse the current direction and status of research in MQL. Objective: This study aims to assess global research publication trends and hot topics in the field of MQL among machining process. The bibliometric and descriptive analysis are the tools that the investigation aims to use for the data analysis of related literature collected from Scopus databases. Methods: Various performance parameters are extracted, such as document types and languages of publication, annual scientific production, total documents, total citations, and citations per article. The top 20 of the most relevant and productive sources, authors, affiliations, countries, word cloud, and word dynamics are assessed. The graphical visualisation of the bibliometric data is presented in terms of bibliographic coupling, citation, and co-citation network. Results: The investigation reveals that the International Journal of Machine Tools and Manufacture (2611 citations, 31 hindex) is the most productive journal that publishes on MQL. The most productive institution is the University of Michigan (32 publications), the most cited country is Germany (1879 citations), and the most productive country in MQL is China (124 publications). The study shows that ‘Cryogenic Machining’, ‘Sustainable Machining’, ‘Sustainability’, ‘Nanofluid’ and ‘Titanium alloy’ are the most recent keywords and indications of the hot topics and future research directions in the MQL field. Conclusion: The analysis finds that MQL is progressing in publications and the emerging with issues that are strongly associated with the research. This study is expected to help the researchers to find the most current research areas through the author’s keywords and future research directions in MQL and thereby expand their research interests.

Conclusion

2020 ◽  
pp. 698-719
Author(s):  
Ronald E. Rice ◽  
Simeon J. Yates ◽  
Jordana Blejmar
Keyword(s):  
Digital Technology ◽  
Digital Literacy ◽  
Theory Development ◽  
Policy Implications ◽  
Digital Culture ◽  
Future Research ◽  
Technology And Society ◽  
Ongoing Research ◽  
Positive Effects ◽  
Research Areas

We conclude the Handbook of Digital Technology and Society by identifying topics that appear in multiple chapters, are more unique to some chapters, and that represent general themes across the material. Each of these is considered separately for the ESRC theme chapters and the non-ESRC chapters. In the ESRC theme chapters, cross-cutting research topics include digital divides and inequalities; data and digital literacy; governance, regulation, and legislation; and the roles and impacts of major platforms. Cross-cutting challenges include methods; theory development, testing, and evaluation; ethics; big data; and multi-platform/holistic studies. Gaps include policy implications, and digital culture. In the non-ESRC chapters, more cross-cutting themes include future research and methods; technology venues; relationships; content and creation; culture and everyday life; theory; and societal effects. More unique, these were digitization of self; managing digital experience; names for the digital/social era; ethics; user groups; civic issues; health, and positive effects. The chapter also shows how the non-ESRC chapters may be clustered together based on their shared themes and subthemes, identifying two general themes of more micro and more macro topics. The identification of both more and less common topics and themes can provide the basis for understanding the landscape of prior research, what areas need to be included in ongoing research, and what research areas might benefit from more attention. The chapter ends with some recommendations for such ongoing and future research in the rich, important, and challenging area of digital technology and society.

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