Bore Pile Design d=1500-41m-Hk8

Job N o :  Project:  Owner:  Item: 

1 5/1/2012 

Rev. No. Date: 

Royal Garden 

Designed by: Lê Ngọc Hiền Checked by: Nguyễn Văn Doãn

BORE PILE DESIGN A. GENERAL DATA Bottom level of pilecap: Diameter of pile: Pile length: Pile length from ground level: Rebar diameter: Rebar number:

Df = d= Lp = f= n=

6 1.5 35.0 41.0 22 20

m m m

Hw =

10

m

type

hi (m) 0.6 5.40 18.0 8.5 8.5

(T/m3) 1.800 2.000 2.000 1.960 2.040

(T/m3) 1.800 1.680 1.680 1.640 1.710

2.040

1.710

mm

cm²

B. SOIL DATA Underground water Position

layer

ABOVE PILECAP

1 2 2 3 5 3 4 5 7 8 9 10 11 5

BELOW PILECAP

END PILE

clay clay clay sand clay sand sand clay sand sand sand sand sand clay

tn

dn

C (T/m2)

SPT

2.00 2.00 0.50 3.70

10.60 10.60 20.00 13.08

11 11 13 35

3.700

13.083

35.000

C. PILE BEARING CAPACITY Ptk = MIN(1,2,3)

=

Ptk = 1. Refer to material Material data : - Concrete grade: Chọn

1072

T

1000

T

- Steel grade: Qvl=

Pile capacity

Rn =

60.00

Kg/cm

A-III

Ra =

3600

Kg/cm2

1329

T

(1)

2. According to soil data (appendix B -TCXD 205-1998) Qa = Allowable pile capacity 1072

T

(2)

Qa = QS / FSs + Qp /FSp Ultimate pile capacity

Qu =

1338

T

Qu = uSfsili + qpAp With: fsi:

skin friction

qp: u: Ap:

end bearing pile di diameter pile cross section

FSs:

safety factor for skin friction

FSp:

safety factor for end bearing FSs =

1

FSp = u= Ap =

2 4.712 1.767

2

C35

m m²

+ fs = Ca + s'h tgja Ca =

C

ja =

3j/4

s'h = kss'v = (1-sinj)s'v s'v = Sgihi

+ qp = cNc + s'vNq + gdNg Nc ,Nq ,Ng sub to j layer 1 2 2 3 5

type clay clay clay sand clay

h m 0.6 5.4 18 8.5 8.5

END PILE

i

(T/m³) 1.8 1.68 1.68 1.64 1.71

Ci (T/m²)

deg.

2 2 0.5 3.7

10.6 10.6 20 13.0833

25.27 6.97 32.54

3.7

13.0833

68.87

1.71

'v (T/m²)

i

fs (T/m²)

fs*li (T/m)

4.88 1.73 8.05

87.8 14.7 68.5

10.15

sum j=

13.08 deg. Nc 11.5 qp =

0.228347244 Nq 3.66 301.22

171.0

Ng 2.50 T/m2

3. Pile bearing capacity according to standard penetration test (TCXD 195-1997) Allow Bearing Capacity:

Qa =

1124

Ton

(3)

Qa = 1.5NTBAp + (0.15NcLc + 0.43NsLs)W - W p With: NTB

SPT index at bottom pile

Ns

SPT index in clay soil layer

Nc

SPT index in sand soil layer

Ls

Length of pile in clay soil layer

Lc

Length of pile in sand soil layer

Area of pile: Parameter of pile: layer 1 2 2 3 5 3 4 5 7 8 9 10 11 END PILE SUM

h (m) 0.6 5.4 18 8.5 8.5

NTB

Ap = W=

1.77 4.71

Nc

Lc (m)

m2 m Ns 11 11

13

Ls (m) 0.6 5.4 18

8.5

NcLc

NsLs

198 110.5

35

8.5

297.5

Wp (T)

26.083 12.918 11.866

35 110.5

495.5

50.867