Kumar, Rakesh and Mishra , A.K. and Singh, Amit Kumar and Singh, Arun Kumar and Singh , Rajendra (2015) Cable Bolting Based depillaring of a Thick Coal Seam in Single Lift : A case Study. MGMI Transactions , 111.

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Abstract

This paper provides basics of “cable bolting based thick seam depillaring” developed at CSIR-CIMFR to meet the technical challenges arising during underground extraction of a thick coal seam of India. It also summaries results of its application at Madhusudenpur 7 Pit and Incline colliery of Eastern Coalfield Limited (ECL). More than fifteen panels of nearly 7 m thick kajora Top seam at this mine are successfully depillared by this method. The seam is developed on pillars along the floor to an average height of 3.0 m leaving a coal band of 3.5 to 4.5 m in the roof. The coal seam is located at shallow depth of cover and the thickness of burden over these worked out panels varied from 20 to 70 m only. A study of the nature of overlying strata through procured core samples found it easily caveable. Although rate of extraction remained, relatively, slow due to semi-mechanised approach of coal winning and evacuation, underground instrumentation and monitoring of strata movement did not experience and strata control problem. Presence of easily caveable overlying strata and shallow depth of cover of madusudanpur arrested the envisaged chances of strata control problems during underground mining of total thickness of a thick seam in single lift. However, differential subsidence and tensile cracks on surface are observed during the depillaring.

Item Type:	Article
Subjects:	Thick Seam Mining
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	03 Nov 2022 06:46
Last Modified:	03 Nov 2022 06:46
URI:	http://cimfr.csircentral.net/id/eprint/2541

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