Title: Investigation in to the causes of severe roof problems in some Indian coal mines and formulation of guidelines to reduce ground control problems

Authors: S. Sengupta; R.K. Sinha; D.S. Subrahmanyam; D. Joseph

Addresses: Geotechnical Engineering Department, National Institute of Rock Mechanics, ITI Bhavan Annex Building, Old Madras Road, Doorvani Nagar, Bangalore 560 016, Karnataka, India. ' Geotechnical Engineering Department, National Institute of Rock Mechanics, ITI Bhavan Annex Building, Old Madras Road, Doorvani Nagar, Bangalore 560 016, Karnataka, India. ' Geotechnical Engineering Department, National Institute of Rock Mechanics, ITI Bhavan Annex Building, Old Madras Road, Doorvani Nagar, Bangalore 560 016, Karnataka, India. ' Engineering Geophysics Department, National Institute of Rock Mechanics, P.O. Champion Reefs, Kolar Gold Fields, Karnataka, India

Abstract: Severe roof stability problems are encountered in many of the Indian Coal Mine the cause of which could not be understood properly and thus no preventive measure could be taken. The discontinuous and random roof failure in the same stretch of level galleries/dip rises under the same geological conditions defied any logic. Actual stress measurement in two mines having such problems revealed perturbed stress condition which backed by numerical modelling helped in understanding the cause and pattern of failure. Based on the study a broad guideline of support system to deal with the roof failure problem could be evaluated.

Keywords: hydrofracturing; in-situ stress; level galleries; dip rises; stress perturbation; severe roof problems; India; coal mines; mining; roof stability; roof failure; numerical modelling; roof support systems; guidelines.

DOI: 10.1504/IJMME.2011.045471

International Journal of Mining and Mineral Engineering, 2011 Vol.3 No.4, pp.290 - 302

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 14 Feb 2012 *

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