Results 141 to 150 of about 2,553 (189)

Investigation of the effect of caving height on the efficiency of the longwall top coal caving production method applied in inclined and thick coal seams by physical modeling

International Journal of Rock Mechanics and Minings Sciences, 2023
© 2022 Elsevier LtdThe longwall top coal caving (LTCC) production method, applied by forming a face in the horizontal thickness of the seam and also called horizontal section top coal caving, especially in studies originating from China, is widely used ...
Arif Çelik, Y Özçelik
exaly   +2 more sources

Application of a mesh-free continuum method for simulation of rock caving processes

International Journal of Rock Mechanics and Minings Sciences, 2011
Understanding the caving process and material flow is fundamental to block and sublevel cave mining, and also to longwall mining in sedimentary deposits.
Shivakumar Karekal, Raj Das, Paul W Cleary   +2 more
exaly   +3 more sources

Numerical Damping Calibration Study of Particle Element Method-Based Dynamic Relaxation Approach for Modeling Longwall Top-Coal Caving

Energies, 2021
When using the explicit dynamic relaxation approach (DRA) to model the quasi-static rock breakage, fragmentation, and flow problems, especially the top-coal caving question, introducing numerical damping into the solution equation is inevitable for ...
Shen Wang, Xiaokai Xu, Zhang Weiyu
exaly   +2 more sources

Stress analysis of longwall top coal caving

International Journal of Rock Mechanics and Minings Sciences, 2010
Longwall top coal caving (LTCC) is a relatively new method of mining thick coal seams that is currently achieving high productivity and efficiency in application, particularly in China.
Habib Alehossein
exaly   +2 more sources

Study of automated top-coal caving in extra-thick coal seams using the continuum-discontinuum element method

International Journal of Rock Mechanics and Minings Sciences, 2019
In order to investigate top-coal drawing regularity and automated top-coal caving technology in extra-thick coal seams, an approach coupling the particle element and the block element is presented based on the continuum-discontinuum element method (CDEM).
Qunlei Zhang, Jinchao Yue, Chun Feng
exaly   +2 more sources

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Comparison of 222Rn measurement methods in caves

2021
<p>Radon (222Rn) is a naturally inert radioactive gas, originating from the radioactive decay of 226Ra in the 238U radioactive decay chain. 222Rn has a variety of geoscientific applications. 222Rn, however, represents the most significant source of ionizing radiation exposure and can be critical in underground working and living spaces ...
Sara Gil-Oncina, Concepción Pla, Javier Valdes-Abellan, Noé Garcia-Martinez, David Benavente   +4 more
openaire   +1 more source

Cave Art in Context: Methods for the Analysis of the Spatial Organization of Cave Sites

Journal of Archaeological Research, 2011
Investigations of prehistoric cave art have long neglected the surrounding context: space, archaeological objects, and imprints. As a result, an integrative structural approach that analyzes cave art as part of an anthropomorphized landscape has not been available.
Andreas Pastoors, Gerd-Christian Weniger
openaire   +1 more source

Longwall and caving mining methods

1985
The essential geomechanical features of longwall and caving methods of mining were outlined in Chapter 12. Longwall and caving methods are distinguished from other mining methods by the fact that the near-field rock undergoes large displacements so that mined voids become self-filling.
B.H.G. Brady, E.T. Brown
openaire   +1 more source

A preliminary evaluation of Cave's roentgenographic method of fetal cephalometry

American Journal of Obstetrics and Gynecology, 1951
Abstract A brief review of the literature relating to roentgenographic cephalometry has been presented. Particular emphasis has been given to the recent work of Cave, and his so-called precision method has been evaluated. If grossly unsatisfactory roentgenograms are excluded—and we are of the opinion that such roentgenograms can usually be excluded ...
T W, McELIN, S B, LOVELADY, R W, BRANDES, J S, HUNTER, C A, GOOD   +4 more
openaire   +2 more sources

Cave detection using multiple geophysical methods: Unicorn cave, Harz Mountains, Germany

Geophysics, 2011
Abstract Unicorn cave in the southern Harz Mountains of Germany is a show cave in dolomitic rocks of the Zechstein Formation. The cave's trunk passage is interrupted by larger rooms. The overburden is only around 15 m. The passages are filled with sediments that can be up to 50 m thick.
Georg Kaufmann, Douchko Romanov, Ralf Nielbock   +2 more
openaire   +1 more source