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Discontinuous Modelling of Stratum Cave-in in a Longwall Coal Mine in the Arctic Area
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. Group of Engineering Geology and Geophysics.
2014 (English)In: Geotechnical and Geological Engineering, ISSN 0960-3182, E-ISSN 1573-1529, Vol. 32, no 5, 1239-1252 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents a discontinuous numerical approach for studying roof cave-in mechanisms and obtaining the required support capacity of longwall shields in a case study site, the Svea Nord coal mine in Svalbard. The block size in the roof strata and the mechanical parameters of the discontinuities for the numerical model were obtained through back-calculations. The back-calculations were conducted with a statistical method of design of experiment. Numerical simulations revealed that voussoir jointed beams are formed before the first cave-in occurs. The maximum deflection of a roof stratum in the study site prior to the first cave-in is about 70 % of the stratum thickness. The maximum span of the roof strata prior to the first cave-in depends upon the in situ horizontal stress state. The roof beams have a large stable span when they are subjected to high horizontal stress; but horizontal stress would increase the possibility of rock crushing in deflected roof beams. The simulations and field measurements show no periodic weighting on the longwall shields in the study site. Stiff and strong roof beams would result in large first and periodic cave-in distances. As a consequence of having large cave-in distances, the longwall shields must have high load capacity, which can be calculated by the presented numerical approach.

Place, publisher, year, edition, pages
2014. Vol. 32, no 5, 1239-1252 p.
Keyword [en]
Cavability, Cave-in, Coal mining, Longwall mining, Longwall shield, Numerical modelling, Voussoir beam
National Category
Geotechnical Engineering
URN: urn:nbn:se:kth:diva-161531DOI: 10.1007/s10706-014-9795-yScopusID: 2-s2.0-84907592761OAI: diva2:794680

QC 20150312

Available from: 2015-03-12 Created: 2015-03-12 Last updated: 2015-03-12Bibliographically approved

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Jing, Lanru
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