Abstract
Subsidence investigations were conducted over three superimposed longwall panels in the Kamptee coalfield of Central India. The extracted contiguous seams were lying below a water bearing unconfined aquifer. Filling of voids with sand hydraulically was practised to avoid a sudden inrush of water into the under-ground workings through ground-movement induced cracks. The non-effective width of extraction varied between 0.55 and 0.61 times the thickness of intact rockmass in the overburden. The maximum subsidence, slope, compressive and tensile strains were 9% of extraction thickness, 6.1, 6.6 and 5.3mmm−1, respectively. The angle of draw was influenced by the presence of a fault and composition of superincumbent strata. The ground movements lowered water table by 6.5m in the unconfined aquifer due to the mining.
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