Results 171 to 180 of about 79,646 (225)

Geotechnical Evaluation of the Support of Coal Pillars in Underground Coal Mines

Environmental & Engineering Geoscience, 1982
Failure of the mine floor supporting coal pillars frequently occurs when the subcoal strata include “underclays” or other low strength strata. The failure process has been studied to define the response of these materials to applied coal pillar loads and to determine the applicability of bearing capacity analysis to evaluate unsafe conditions.
J.D. Rockaway, R.W. Stephenson
openaire   +1 more source

Underground lighting in coal mines

Proceedings of the IEE Part A: Power Engineering, 1956
The importance of lighting below ground is emphasized and the difficulties associated therewith are outlined. Inadequate or inferior lighting produces nystagmus, and mention is made of the decline in the incidence of new cases since better lighting has been introduced. Changes in portable lamps, with improvements in technique and to suit alterations in
openaire   +1 more source

Floor design in underground coal mines

Rock Mechanics and Rock Engineering, 1989
Floor failure and excessive heave in underground coal mines can jeopardize the stability of the whole structure, including the roof and pillars, due to differential settlements and redistribution of stress concentrations. Besides, floor failure is detrimental to haulageway operation and can lead to unacceptable conditions of high deformation. Thus, the
C. Faria Santos, Z. T. Bieniawski
openaire   +1 more source

Modeling of Underground Coal Mining Processes

Optoelectronics, Instrumentation and Data Processing, 2019
This paper presents a comprehensive simulation model of underground coal mining processes in a fully mechanized longwall mining face. A number of simulation experiments were performed. The face productivity is estimated as a function of various factors such as the technical parameters of mining machines, face length, gas factor, shearer operation mode,
V. V. Okolnishnikov, A. A. Ordin, S. V. Rudometov   +2 more
openaire   +1 more source

Explosion hazards in underground coal mines

Toxicological & Environmental Chemistry, 1993
A review of the incidence, causes and prevention of coal dust explosions is given in this paper. A statistical summary of fire and explosion incidents in Nova Scotia coal mines over the last century is presented. Techniques for explosion prevention which are discussed include avoidance of ignition sources, use of ventilating air, and rock dusting ...
Paul R. Amyotte, Michael J. Pegg
openaire   +1 more source

Time studies in underground coal mining

2012
Kenilworth is situated in Carbon County, Utah, three miles east of Helper and is served by a branch line of the Denver and Rio Grande Western Railroad that Joins the main line at Helper, Utah. The coal mine was first established by the Utah Fuel Company and has been operated since 1907. Geology The rocks exposed in this area belong to the Cretaceous,
openaire   +2 more sources

Research on the Capacity of Underground Reservoirs in Coal Mines to Protect the Groundwater Resources: A Case of Zhangshuanglou Coal Mine in Xuzhou, China

Water (Switzerland), 2023
Chenghang Zhang, Zhimin Xu
exaly  

UNDERGROUND MINING OPERATIONS IN ZONGULDAK COAL MINES

1966
The object of this article is to present all the aspects of underground mining activities in Zonguldak coal mines, the history of the mines, geological conditions, coal seam characteristics and general layout of the districts. Emphasis has been paid to mining methods, old and new, the available machinery and rates of output.
openaire   +1 more source

Underground Explosions in Coal Mines

Medicine, Science and the Law, 1976
openaire   +2 more sources

Study on the Interaction Mechanism between Residual Coal and Mine Water in Goaf of Coal Mine Underground Reservoir

Sustainability, 2023
Zhiguo Cao, Dingcheng Liang
exaly