MODIFICATION OF BLASTING GEOMETRY TO INCREASE BLASTING EFFECTIVENESS IN QUARRY

B Sulistiyono^[1]*, F Nugraheni², M A Wibowo³, A Musyafa²

¹ PT. Wijaya Karya

² Universitas Islam Indonesia

³ Universitas Diponegoro

[1]^* Corresponding author’s email: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol2.art10

ABSTRACT

It is thought that a technique for carrying out blasting operations for rock extraction must be both effective and secure. It is intended that the blasting will be both safe and able to meet the needs of the stockpile material because the blasting area is adjacent to residential areas. This study intends to determine the cost and duration of the rock excavation work by blasting at the Trenggalek Tugu Dam Construction Project, as well as the effectiveness brought about by the implementation of modified blasting geometry. The inquiry was supported by descriptive and comparative methodologies. For this study, both quantitative and qualitative data were required. Quantitative data was gathered using working drawings, tool specifications, and material specifications; qualitative data was gathered using work procedures, specifications, and islands for related jobs. Quantitative information is obtained through the analysis of papers written by consultants and service providers. To acquire qualitative power, interviews with subject-matter experts and literature research were conducted. Because the work can be done more rapidly than with the prior geometry and because doing so has a lower cost analysis, the results reveal that using the modified geometry is more cost-effective than using the prior blasting geometry. Utilizing a combination of blasting geometry using the CJ Konya method and ICI-Explosive, there was a 9.3% acceleration in task execution and a 1.133% cost efficiency of the contract value (Trial & Error).

Keywords: Blasting, Construction; Cost-effective; Geometry

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