Abstract
The author is indebted towards the excellent cooperation and support provided by the entire operational crew, staff and management of the BCCL during collection of data for this study.
Highlights
Blasting in underground colliery is controlled by coal mines regulations 1957 and various circulars, issued by Director General of Mines Safety under those regulations
– pull is related to the cross-sectional area
– higher pull can be achieved by improved drilling technique as was used in colliery-A, with modified wedge cut pattern;
Summary
The study conducted in three different underground collieries namely A, B and C located in eastern part of India has been accomplished by solid blasting using milli-second short delay detonators and wedge cut pattern. The trial blasts were conducted in underground mines to investigate the effect of gallery size on blast pull. From the study it was found that the pull is related to the cross sectional area of the drive. It increases as the face size increases. This relation is obtained considering width of the gallery in the range of 3.0 – 4.8 m and height of the gallery in the range of 2.2 – 3 m. Similar studies have been done by various researchers to improve the productivity of the mine for different conditions, the obtained results are condition, machinery, method and mine specific. This study is applicable for underground coal mine but can be extended in underground metal and tunneling projects for improving the blast pull
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