I. Perhitungan1.1 Desain Data

Parameter Bore PileFs = 3Parameter TanahNSPT Pile 1-8 = 17,5

Komponen Skin Resistance (Qs)Qs adalah Daya dukung akibat adhesi tanah dengan tiang (skin resistance)

Qs1 = keliling lingkaran x tinggi x 0,2 x nilai NSPT= x 1,35 x 3,5 x 0,2 x 17.5= 51,928TonQs2 = keliling lingkaran x tinggi x 0,2 x nilai NSPT= x 1,35 x 3,5 x 0,2 x 17,5= 51,928TonQs3 = keliling lingkaran x tinggi x 0,2 x nilai NSPT= x 1,35 x 3,5 x 0,2 x 17,5= 51,928TonQs4 = keliling lingkaran x tinggi x 0,2 x nilai NSPT= x 1,35 x 3,5 x 0,2 x 17,5= 51,928TonQs5 = keliling lingkaran x tinggi x 0,2 x nilai NSPT= x 1,35 x 3,5 x 0,2 x 17,5= 51,928TonQs6 = keliling lingkaran x tinggi x 0,2 x nilai NSPT= x 1,35 x 3,5 x 0,2 x 17,5= 51,928TonQs7 = keliling lingkaran x tinggi x 0,2 x nilai NSPT= x 1,35 x 3,5 x 0,2 x 17,5= 51,928TonQs8 = keliling lingkaran x tinggi x 0,2 x nilai NSPT= x 1,35 x 3,5 x 0,2 x 17,5= 51,928TonQb total = 51,928 x 8 = 415,422 Ton Komponen ujung fondasi (Qb)Qb adalah Daya dukung oleh dasar tiang (base)Qb1 = Luas Lingkaran x (375 + 10(N-15))= 0,25 x x 1,352 x (375 + 10(17,5-15))= 572,265TonQb2 = Luas Lingkaran x (375 + 10(N-15))= 0,25 x x 1,352 x (375 + 10(17,5-15))= 572,265TonQb3 = Luas Lingkaran x (375 + 10(N-15))= 0,25 x x 1,352 x (375 + 10(17,5-15))= 572,265TonQb4 = Luas Lingkaran x (375 + 10(N-15))= 0,25 x x 1,352 x (375 + 10(17,5-15))= 572,265TonQb5 = Luas Lingkaran x (375 + 10(N-15))= 0,25 x x 1,352 x (375 + 10(17,5-15))= 572,265TonQb6 = Luas Lingkaran x (375 + 10(N-15))= 0,25 x x 1,352 x (375 + 10(17,5-15))= 572,265TonQb7 = Luas Lingkaran x (375 + 10(N-15))= 0,25 x x 1,352 x (375 + 10(17,5-15))= 572,265TonQb8 = Luas Lingkaran x (375 + 10(N-15))= 0,25 x x 1,352 x (375 + 10(17,5-15))= 572,265TonQb total = 572,265x 8 = 4578,12 Ton efisiensi pile group (eg) (n - 1)m + (m-1)neg = 1 90.m.n = 1 - tan-1 (1350/3070) x = 0,670 Daya dukung batas (ultimate) (Qu)

Qu1 = Qs1 + Qb1 = 51,928+ 572,265= 624,19275 Ton

Qu2 = Qs2 + Qb2 = 51,928+ 572,265= 624,19275 Ton

Qu3 = Qs3+ Qb3= 51,928+ 572,265= 624,19275 Ton

Qu4 = Qs4 + Qb4= 51,928+ 572,265= 624,19275 Ton

Qu5 = Qs5 + Qb5= 51,928+ 572,265= 624,19275 Ton

Qu6 = Qs6 + Qb6= 51,928+ 572,265= 624,19275 Ton

Qu7 = Qs7 + Qb7 = 51,928+ 572,265= 624,19275 Ton

Qu8 = Qs8 + Qb8 = 51,928+ 572,265= 624,19275 Ton Daya dukung ijin (allowable) (Qa)Qa1 = Qu/Fk = 624,19275/3 =208,06425Qa2 = Qu/Fk = 624,19275/3 =208,06425Qa3 = Qu/Fk = 624,19275/3 =208,06425Qa4 = Qu/Fk = 624,19275/3 =208,06425Qa5 = Qu/Fk = 624,19275/3 =208,06425Qa6 = Qu/Fk = 624,19275/3 =208,06425Qa7 = Qu/Fk = 624,19275/3 =208,06425Qa8 = Qu/Fk = 624,19275/3 =208,06425 Daya dukung Pile GroupQag pile (1-8)= eg . Qa= 0,67 x 208,06425= 139,403Qag pile total = 139,403 x 8 =1115,224 Ton