Sage Journals: Discover world-class research

Abstract

Induced caving by blasting during depillaring of panels in underground coal mines has received limited attention. This technique has become an integral part of a mining operation known as the blasting gallery (BG) method in India. Systematical deep hole (16–30 m) blasting has been successfully carried out from underground split galleries in BG panels. A study of drilling and blasting parameters, gas hazards, strata behaviour and ground vibration was undertaken as part of a research project for the Indian Ministry of Coal and Mines. Strata behaviour during blasting and ground movements were critically investigated. All experiments were conducted using newly developed explosive and detonating cord systems. A new blast damage index is proposed for damage assessment of the underground roof and pillars of BG panels. Useful mathematical formulas are described as an aid to future design.

Keywords

COAL MINING BLASTING DEPILLARING INDUCED CAVING

Get full access to this article

View all access options for this article.

References

ROY

P. PAL

, SINGH

M. M.

and SINGH

R. B.

: ‘Induced caving by long-hole underground blasting—a case study in BG Panel at GDK-10 Incline Mine of SCCL’, Proc. 2nd Natl Conf. on ‘Ground control in mining’, October 1996, 265–276.

DHAR

B. B.

and SHEOREY

P. R.

: ‘Strata control aspects of the blasting gallery method of depillaring thick seam’, J. Min. Met. Fuels, Kolkata, Nov.–Dec. 1991, 398–401, CMRI.

MAITY

S. N.

: ‘Implementation of BG method for extraction of thick seam at Singareni Collieries and strata control investigations to improve productivity’, Proc. Platinum Jubilee Symp. on ‘Productivity improvement in Indian mining industries’, January 1999, IT, Benares Hindu University, Varanasi, India, 175–191.

T. R.

and VONGPAISAL

: ‘New blast damage criteria for underground blasting’, CIM Bull., 1996, 89, (998), 139–145.

DOWDING

C. H.

: ‘Blast vibration monitoring and control’, 288; 1985, NJ, Prentice-Hall.

GHOSH

: ‘A new analytical predictor of ground vibrations induced by blasting’, MS thesis, University of Arizona, USA, 1983, 322.

ROY