Effect of blast designs on rock fragmentation at lafarge kanthan quarry, Chemor, Perak
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Date
2018-05
Authors
Nur Aliah Hazirah Awang Kechik
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Abstract
This study was sought to study the effects of blast design parameters on rock
fragmentation. The field study was carried out at Lafarge Kanthan Quarry, Chemor,
Perak for the duration of 3 weeks. After blasting, the images of muck pile were taken
using suitable camera. The images then were uploaded into the WipFrag software to
analyze the fragmentation generated from the blasting. The particle size distribution
graphs obtained from the software had been correlated with the blast designs. The
percentage cumulative passing for gyratory crusher with the feed size of 1500 mm
ranges between 92.8 to 100 %. Blast design parameters such as bench height, powder
factor, stemming have high correlation with the rock fragmentation. Bench height to
burden ratio (H/B) shows the highest correlation to the mean fragment size with the value
of R2=99.7%. Moreover, it is indicated that as the powder factor increases, the finer the
mean fragment size. Powder factor also has a high correlation with the uniaxial
compressive strength of the rock. The compressive strength of blasted rocks ranges
between 66.01 to 115.81 MPa. The results show that the higher the uniaxial compressive
strength of rock, the higher the powder factor needed. In this study, spacing to burden
ratio (S/B) has a very weak correlation with the rock fragmentation. Even though there
was an occurrence of oversize rocks, all blasting events had generated a good rock
fragmentation with uniformity index varies from 2.09 to 2.28.