WAHYUDI, Sugeng (2017) Study of Characteristics of Surface Subsidence in Longwall Coal Mine under Poor Ground Conditions in Indonesia. Earth Science Research, 6 (1). ISSN ISSN 1927-0542 E-ISSN 1927 -0550

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Abstract

This paper aims to study the characteristics of surface subsidence induced by longwall mining under poor ground conditions in Indonesia by means of numerical simulation techniques using finite difference code “FLAC3D”.
The effect of mining depth in cases of single panel and multi-panel longwall mining, the influence of panel and
pillar widths, and the impact of backfilling material, were incorporated into the FLAC3D software. The
simulated results indicated that the angle of draw and maximum surface subsidence were significantly associated
with the depth of mining, the number of extracted panels, the width of panel and pillar, and the type of backfill.
In single panel mining, the largest maximum surface subsidence is observed in case of the shallowest mining
depth, and it gradually decreases as the depth increases. In contrast, the angle of draw increases with increasing
the mining depth. In multi-panel mining, the angle of draw and maximum surface subsidence increase as the
mining depth increases. Moreover, the angle of draw and maximum surface subsidence decrease when the narrow panel and

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