ANALYSIS OF THE GROUND SURFACE SUBSIDENCE IN THE JIU VALLEY COAL BASIN BY USING THE FINITE ELEMENT METHOD

11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 1, 685-692 pp

ABSTRACT

In the case of this thick and gentle coal seam no.3 of the Jiu Valley coal basin (Romania), the mining methods are by use of the longwall mining technologies with roof control by caving or top coal caving. In this paper, it is presented the analysis of the complex deformations of ground surface, over time, as a consequence of the coal
mining in certain mining fields of the basin. Also, it is analysed the ground surface subsidence phenomenon using the CESAR-LCPC finite element code. The modelling is made in the elasticity and the elasto-plasticity behaviour hypothesis for two significant cases of Livezeni and Uricani mines. The obtained results are compared with the in situ
measurements data basis.

Keywords: subsidence, displacement, longwall mining, finite element method, profile function