WIBOWO, TRI (2011) KAJIAN TEKNIS GEOMETRI PELEDAKAN TERHADAP FRAGMENTASI BATUAN YANG DIHASILKAN DI PIT E PT. BUKIT MAKMUR MANDIRI UTAMA JOB SITE BINUNGAN BERAU KALIMANTAN TIMUR. Other thesis, UPN "Veteran" Yogyakarta.
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Abstract
Pembongkaran over burden oleh PT. Bukit Makmur Mandiri Utama dilakukan dengan metode pemboran dan peledakan. Diameter lubang tembak 7 7/8 inchi dan geometri peledakan adalah burden 8,5 m, spasi 9,5 m, stemming 4,5 m, subdrilling 0,5 m, panjang kolom isian 4,5 m, kedalaman lubang bor 9 m, tinggi jenjang 8,5 m. Bahan peledak 170,1 kg per lubang ledak, powder factor 0,25 kg/m3 dan bahan peledak yang digunakan adalah Emultion Blend buatan PT. DNX dengan komposisi 70 % Emultion dan 30 % AN. Pola peledakan yang diterapkan yaitu Box cut beruntun antar lubang dan baris dengan menggunakan in hole delay 450 ms dan surface delay detonator 17 ms, 25 ms, 42 ms dan 65 ms. Metode peledakan yang digunakan adalah non elektrik. Target fragmentasi boulder yang diharapkan adalah < 15 %. Tingkat fragmentasi batuan hasil peledakan di lapangan untuk ukuran 120 cm (boulder) berdasarkan perhitungan secara teoritis maka persentase boulder sebesar 24,27 % dan secara aktual yaitu 25 %. Faktor penyebab terjadinya bongkah karena belum tepatnya penerapan geometri peledakan. Dengan memperhatikan karakteristik batuan, karakteristik bahan peledak dan metode peledakan, maka dalam rancangan peledakan (Konya, 1990) menghasilkan geometri peledakan yaitu burden 7,1 m, spasi 7,3 m, stemming 6,4 m, kedalaman lubang tembak 10,6 m, tinggi jenjang 8,5 m, subdrilling 2,1 m, panjang kolom isian 4,2 m, bahan peledak 158,76 kg per lubang ledak, powder factor 0,35 kg/m3 dan volume setara 42,04 m3/m. Fragmentasi boulder yang dihasilkan dengan menggunakan rancangan peledakan (Konya,1990) adalah 14,87 % dan boulder nyata di lapangan adalah 13,95%. ABSTRACT PT. Bukit Makmur Mandiri Utama is a company that engages in mining and is one of the mining coal company contractors of Berau Coal, which has operations in the Village Binungan, District Sambaliung, Berau, the Province of East Kalimantan. Mining system that is used by PT. Bukit Makmur Mandiri Utama is a system of surface mining by open pit methods. Over burden demolition by PT. Bukit Makmur Mandiri Utama performed by drilling and blasting method. The hole diameter shoot is 7 7/8 inch and desain of gemetry blasting is space 9.5 m, burden 8.5 m, stemming 4.5 m, subdrilling 0.5 m, length of field 4,5 m, depth of the drill hole is 9 m, High levels is around 8.5 m. Explosive is 170.1 kg per hole, powder factor is 0.25 kg/m3 and explosives that are used are Emultion Blend made by PT. DNX with a composition of 70% Emultion and 30% AN. Blasting pattern is applied to the box cut a row between holes and rows by using a 450 ms delay in the hole and surface delay detonator 17 ms, 25 ms, 42 ms and 65 ms. Blasting method used is non-electrically. Target fragmentation boulder that expected is <15%. Level of fragmentation of rock blasting results in the field to the size of > 120 cm (boulder) based on the theoretical calculation the percentage of boulder of 24.27% and the actual is 25%. Factor contributing to the blocks because it has not exactly blasting the application of geometry. By considering the characteristics of rocks, characteristics of explosives and methods of blasting, blasting it into the design (Konya, 1990) produce a detonation geometry of burden 7,1 m, space 7,3 m, stemming 6,4 m, deep shoot holes 10,6 m, high level of 8,5 m, subdrilling 2.1 m, long field 4.2 m, explosive per hole is 158.76 kg, powder factor 0.35 kg/m3 and equal volume of 42.04 m3/m. Boulder fragmentation generated by using a design of blasting (Konya, 1990) is 14.87% and a real boulder in the field is 13.95%.
| Item Type: | Thesis (Other) |
|---|---|
| Subjects: | T Technology > TN Mining engineering. Metallurgy |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eny Suparny |
| Date Deposited: | 08 Jun 2016 06:38 |
| Last Modified: | 08 Jun 2016 06:38 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/3267 |
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