Sawmliana, C and Pal Roy, P. (2012) A New Blastability Index for Hard Roof Management in Blasting Gallery Method. Geotechnical and Geological Engineering , 30 (6). pp. 1357-1367. ISSN 0960-3182

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Abstract

The presence of hard and massive sandstone above the coal seam in underground coal mines often leads to delay in caving of overlying rock beds thereby causing excessive load on supports and posing danger to underground workings. The problem is more prominent in blasting gallery (BG) as well as longwall mining methods in Indian coal mines. Induced caving by blasting is a promising means for hard roof management in underground coal mines. Based on extensive studies and data collected from different mines in India, a Blastability Index (BI) has been developed which can be used for the classification of roof according to the degree of ease in caving by induced blasting. Different charge factors have also been suggested based on the Blastability Index. Due to wide change in the method of extractions, ‘Cavability Index’ for longwall panel was found ineffective in case of BG method of working as well as bord and pillar working. For this reason, this proposed Blastability Index would be of immense help for caving of hard roof by induced blasting.

Item Type:	Article
Uncontrolled Keywords:	Blasting gallery, Longwall mining, Blastability Index, Induced caving, Cavability Index, Rib-pillar, Adjustment factor, Powder factor
Subjects:	Blasting
Divisions:	UNSPECIFIED
Depositing User:	Dr. Satyendra Kumar Singh
Date Deposited:	01 Jan 2013 07:03
Last Modified:	01 Jan 2013 07:03
URI:	http://cimfr.csircentral.net/id/eprint/1399

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