Fix Soal Part Of Time Round.docx

Geometri pemboran dan peledakan dengan Normal Profile Blasting H=

m

B=

m (Grafik 5)

lb =

kg/m (Grafik 5)

NB : Khusus untuk Wall dan Roof perhitungan menggunakan cara (2) Penentuan lb tiap round berdasarkan grafik 4 Height Part of time

Burden

Spasi

bottom

round

(m)

(m)

charge (m)

Charge concentration Bottom

Column

(kg/m)

(kg/m)

Height Stemming

Column

(m)

Charge

Q

Bottom(kg)

Column(kg)

Total(kg)

(m)

Floor

1xB

1.1 x B 1/3 x H

lb

1.0 x lb

0.2 x B

H-hb-ho

lb x hb

l c x hc

Qb + Qc

Wall

0.9 x B

1.1 x B 1/6 x H

lb

0.4 x lb

0.5 x B

H-hb-ho

lb x hb

l c x hc

Qb + Qc

Roof

0.9 x B

1.1 x B 1/6 x H

lb

0.3 x lb

0.5 x B

H-hb-ho

lb x hb

l c x hc

Qb + Qc

Upwards

1xB

1.1 x B 1/3 x H

lb

0.5 x lb

0.5 x B

H-hb-ho

lb x hb

l c x hc

Qb + Qc

Horizontal

1xB

1.1 x B 1/3 x H

lb

0.5 x lb

0.5 x B

H-hb-ho

lb x hb

l c x hc

Qb + Qc

Downwawrds

1xB

1.2 x B 1/3 x H

lb

0.5 x lb

0.5 x B

H-hb-ho

lb x hb

l c x hc

Qb + Qc

Stoping