Failure process and modes of rockfall induced by underground mining: A case study of Kaiyang Phosphorite Mine rockfalls

2015 ◽  
Vol 197 ◽  
pp. 145-157 ◽  
Author(s):  
D. Zheng ◽  
J.D. Frost ◽  
R.Q. Huang ◽  
F.Z. Liu
Keyword(s):  
Underground Mining ◽  
Failure Process

scholarly journals The influence of para-seismic vibrations, induced by blasting works, on structures: a Case Study

2018 ◽  
Vol 36 ◽  
pp. 02001 ◽  
Author(s):  
Wacław Andrusikiewicz
Keyword(s):  
Land Surface ◽  
Underground Mining ◽  
Control Point ◽  
Control Room ◽  
Mining Operations ◽  
Blasting Operation ◽  
Seismic Vibrations ◽  
Harmful Effects ◽  
Seismic Impacts

Underground mining operations are often associated with the necessity to use explosives. Several hundreds of kilograms of explosives, subdivided into small charges suitable for a specific mining job, are used each time in a blasting operation. In many cases, mining engineers carry out remote central blasting works, which means that all the charges placed at faces are initiated from one control point (usually, a control room in the mine) at the same time. Such coordinated explosions generate para-seismic movements whose consequences can be felt on land surface, with subsequent effects identified in buildings and structures. This paper discusses briefly selected standards applicable to the harmful para-seismic impacts. The author presents the results of the research conducted with the intention to identify harmful effects of the basting works carried out in the “Kłodawa” Salt Mine.

scholarly journals Adjusting the Influence Function Method for Subsidence Prediction

2013 ◽  
Vol 553 ◽  
pp. 59-66 ◽  
Author(s):  
Ali Saeidi ◽  
Olivier Deck ◽  
Marwan Al Heib ◽  
Thierry Verdel ◽  
Alain Rouleau
Keyword(s):  
Efficient Method ◽  
Influence Function ◽  
Function Method ◽  
Underground Mining ◽  
Building Damage ◽  
Ground Movement ◽  
Ground Movements ◽  
Influence Function Method ◽  
Vertical Displacements

Theextraction of ore and minerals by underground mining may induce groundsubsidence phenomena. These phenomena produce several types of ground movement likehorizontal and vertical displacements, ground curvature and horizontal groundstrain at the surface, and associated building damage in urban regions. Theinfluence function is a well-known and efficient method for the prediction ofthese movements, but its application is restricted to mining configurationswith the same influence angle around the mine. However, this angle may displaydifferent values when the mine is not horizontal or when other subsidenceevents already occurred near the considered mine.In this paper a methodology and analgorithm are developed, based on the traditional influence function method inorder to take into account different influence angles. This methodology isimplemented in the Mathematicasoftware and a case study is presented with data from the Lorraine iron minefield in France. Ground movements calculated with the developed methodologyshow a fair concordance with observed data.

The Nature of Organizational Mechanisms

2008 ◽  
Vol 29 (11) ◽  
pp. 1449-1468 ◽  
Author(s):  
Kalle Pajunen
Keyword(s):  
Failure Process ◽  
Process Research ◽  
Research Strategies ◽  
Organizational Decline ◽  
Organizational Processes ◽  
Organizational Mechanisms ◽  
Organization Research

One of the basic objectives in organization research is to examine how some organizational occurrence or outcome comes about or, even more fundamentally, to explain how things work. I argue that we can shed more light on these issues by examining the mechanisms driving the organizational processes. In this article I attempt to elucidate the nature of organizational mechanisms, thereby providing a coherent explanatory foundation for process research and processual research strategies. In order to illustrate the nature of mechanisms and explanations by mechanisms, a case study of the organizational decline and failure process of the Finnish conglomerate Tampella is reported.

scholarly journals Techno-Economic Feasibility of the Longwall Top Coal Caving Method Based on the FTCD Index: A Parametric Case Study in India

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6115
Author(s):  
Nasina Balasubrahmanyam ◽  
Gnananandh Budi
Keyword(s):  
Underground Mining ◽  
Economic Feasibility ◽  
Geotechnical Parameters ◽  
Financial Assessment ◽  
High Resource ◽  
Coal Recovery ◽  
Mining Conditions ◽  
Coal Grade ◽  
Longwall Top Coal Caving

An extraction method for deep-seated thick seam deposits by underground mining with high resource recovery has remained a great challenge for Indian mining engineers, whereas the longwall top coal caving (LTCC) method has evolved as an effective method for various geo mining conditions in China and other counties. The percentage of top coal recovery (TCR) plays a predominant role in determining the feasibility of LTCC, which relies on the First Top Coal Caving Distance (FTCD). In this paper, the critical geotechnical parameters are identified, numerically simulated, and statistically analyzed, and the FTCD for Indian geo-mining conditions is developed and validated. A financial assessment is conducted, considering 70% top coal recovery at 85% performance level, cost of production escalated by 20% and fall in coal grade by two grades. The internal rate of return (IRR) for LTCC is 30.24% as per the sensitivity analysis where it is only 18% in single pass longwall method. This study contributes to evaluating both the technical and economic feasibility of introducing LTCC in Indian geo-mining conditions.

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