TUGAS DAN PERHITUNGAN

PRAKTIKUM TEKNIK PELEDAKAN ACARA I KRITERIA PENGGALIAN

Pembacaan Kecepatan seismic :

BATUBARA ANDESIT MUD STONESAND STONE

811 3773 2086 1048829 3773 2097 1048836 3773 2097 1046851 3773 2101 1048831 3773 2101 1049

831,6 3773 2096,4 1047,8

Berdasarkan Grafik metoda kecepatan seismic untuk penentuan penggalian (Atkinson,1971)

Kesimpulannya adalah :

Batubara,Kec.Seismik rata-rata = 831,6 m/d- Stripping shovel : no blasting = Marginal- Walking dragline : no blasting = Marginal- Dragline (crawler) : no blasting = Impossible- Bucket wheel excavator = Impossible- Bucket chain excavator = Impossible- Loading shovel : no blasting = Rippable- Tractor scrapper : after ripping = Rippable- Tractor scrapper : after ripping and etc = Marginal- Labourer with pick & shovel = Marginal

Andesit,Kec.seismik rata-rata = 3773 m/d- Stripping shovel : no blasting = Impposible- Walking dragline : no blasting = Impossible- Dragline (crawler) : no blasting = Impossible- Bucket wheel excavator = Impossible- Bucket chain excavator = Impossible- Loading shovel : no blasting = Impossible- Tractor scrapper : after ripping = Impossible- Tractor scrapper : after ripping and etc = Impossible- Labourer with pick & shovel = Impossible

Mud Stone,Kec.Seismik rata-rata = 2096,4 m/d- Stripping shovel : no blasting = Impposible- Walking dragline : no blasting = Impossible- Dragline (crawler) : no blasting = Impossible- Bucket wheel excavator = Impossible- Bucket chain excavator = Impossible- Loading shovel : no blasting = Impossible- Tractor scrapper : after ripping = Impossible- Tractor scrapper : after ripping and etc = Impossible- Labourer with pick & shovel = Impossible

Sand Stone,Kec.Seismik rata-rata = 1047,8 m/d- Stripping shovel : no blasting = Marginal- Walking dragline : no blasting = Impossible- Dragline (crawler) : no blasting = Impossible- Bucket wheel excavator = Impossible- Bucket chain excavator = Impossible- Loading shovel : no blasting = Marginal- Tractor scrapper : after ripping = Rippable- Tractor scrapper : after ripping and etc = Marginal- Labourer with pick & shovel = Impossible

Berdasarkan grafik criteria penggaruan dengan D9R,Kesimpulanny adalah :

Batubara,Kec.Seismik rata-rata = 831,6 m/d Coal = Rippable

Andesit,Kec.Seismik rata-rata = 3773 m/d Andesit = Impossible

Mud Stone,Kec.Seismik rata-rata = 2096,4 m/d Mud Stone = Rippable

Sand Stone,Kec.Seismik rata-rata = 1047,8 m/d

Sand Stone = Rippable

Perhitungan Point Load Index

Batubara

Is = F. P

De² = 0,452 . 30 6,14² = 0,3596 . 0,1 = 0,03596 Mpa

F = D0,45

5 = 6,1400,45

5 = 0,452

RQD = 100 e -0,1 (λ) ( 0,1 (λ) + 1 ) = 100 e

Andesit

Is = F. P

De²

= 0,390 . 800 4,42² = 15,97 . 0,1 = 1,59 Mpa

F = D0,45

5 = 4,420,45

5 = 0,390

Mud Stone

Is = F. P

De²

= 0,4526 . 50 6,14² = 0,60 . 0,1 = 0,06 Mpa

F = D0,45

5 = 6,140,45

5 = 0,4526

Sand Stone

Is = F. P

De²

= 0,4516 . 70 6,11² = 0,847 . 0,1 = 0,0847 Mpa

F = D0,45

5 = 6,110,45

5 = 0,4516

Berdasarkan grafik criteria penggalian menurut kolleth (1990), Kesimpulannya adalah :

Perhitungan UCS ( Uniaxial Compressive Strength – Mpa )

Batubara

Is = 0,00000101 Mpa

UCS = 0,00000101 Mpa . 23 = 0,0000233 Mpa

Penggaliannya dapat menggunakan :- Dragline,Shovel,Backhoe- Scraper- Surface Miner- Bucket Wheel Excavator

Andesit

Is = 0,0000450 Mpa

UCS = 0,0000450 Mpa . 23 = 0,001035 Mpa

Penggaliannya dapat menggunakan :- Dragline,Shovel,Backhoe- Scraper- Surface Miner- Bucket Wheel Excavator

Mud Stone

Is = 0,0000168 Mpa

UCS = 0,0000168 Mpa . 23 = 0,0000387 Mpa

Penggaliannya dapat menggunakan :- Dragline,Shovel,Backhoe- Scraper- Surface Miner- Bucket Wheel Excavator

Sand Stone

Is = 0,000002385 Mpa

UCS = 0,000002385 Mpa . 23 = 0,0000548 Mpa

Penggaliannya dapat menggunakan :- Dragline,Shovel,Backhoe- Scraper- Surface Miner- Bucket Wheel Excavator