Community Research and Development Information Service - CORDIS


This research project aims to study the mechanisms of ground failure caused by coal mines operating with roof caving method in very steep seams. As the major part of subsidence studies have been applied for sub-horizontal coal seams, there is a need to analyse the theories and methods for the case of sub-vertical orebodies. Due to the diversity of the intervenient variables, a versatile user-friendly numerical model to run in microcomputers was developed.

This models is based in the mechanisms of solid flow, considering the rock mass above the coal mine as very much fractured, and applying the superposition principle to the surface displacements resulting from the propagation of rupture phenomena in the rock mass located above most openings whose roofs have caved. In terms of mathematical algorithm, one based on air diffusion out of the underground openings and up to the ground surface was chosen, which seems to adequately simulate the occuring phenomena.

The model is validated by means of its application to the Germunde coal mine, providing a good agreement with the real values of subsidence. ce.

Additional information

Authors: MENDONÇA ARRAIS C, Empresa Carbonífera do Douro SA, Castelo de Paiva (PT);MENDONCA ARRAIS C, Empresa Carbonifera do Douro SA, Castelo de Paiva (PT)
Bibliographic Reference: EUR 15356 PT (1997) 193pp., FS, ECU 20.00
Availability: Available from the (2)
ISBN: ISBN 92-827-9380-X
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