Open AccessProper Selection of Blasting Charges Location in Quarries and Open Cast Mines
Author(s) -
M.A. Ismail
Publication year - 2006
Language(s) - English
Resource type - Journals
ISSN - 1858-7313
DOI - 10.52981/fjes.v2i1.89
Subject(s) - rock blasting , explosive material , dynamite , cement , geotechnical engineering , detonator , rubble , geology , materials science , mining engineering , composite material , chemistry , organic chemistry
The aim of the present study is to assess the effect of the-zone of weakness on blasting efficiency and to determine the correct position of the explosive charge in relation to the suggested soft layers intercalated inclusions of soft materials avoid the escaping of blasting product (heat, pressure) in the contact layer between soft rock and hard rock (ore). Physical models having dimensions (25x25x33cm) were made of cement and sand (1:3) to represent the strong rock deposits which are intercalated by inclusions or layer of soft material which represented by a mixture of cement and clay. The artificial rock models were tested with 5 gm, 10 gm, 15 gm, 20 gm, of gelatine dynamite with detonator No. 6.The charge of 10 gm was more suitable with respect to the distance of throw which is more important for open cast mining with respect to the dimension of working area on a bench. It has found that, the plane of weakness has less effect when the charge is concentrated on the position after the inclusion of soft layer which gave pressure on soft layer and close the possibility of escaping products.