MINIBOREPILE CAPACITY IN CLAY SOILFormula

Ab= miniborepile area section (cm2)Fb= end bearing capacity (kgcm-2)cb= cohesi in bottom pile (kgcm-2)b= friction angle in bottom pile (deg)F= Pile shape factorAs= side cover area of pile (cm2)fs= friction in pile cover (kgcm-2)

Soil data Standar Penetration Test SH-2

Miniborepile area section

cm2 End bearing capacity= 0

kN.m-2Nc5,14

Nq1,00

N0,00

kgcm-2 Side cover area of pile

cm2 Friction in pile cover

kNm2 = 0,575 kgcm2 Miniborepile capacity (push)

kg

kg Miniborepile capacity (pull)

kg

kgPile Capacity Calculation From N-Spt at SH2 With Meyerhof Formula

Pa= allowable compress pile capacity (ton)Pta= allowable tension pile capacity (ton)qc= 20 N for silt/clay (ton) 40 N for sand (ton)N= N-SPTAp= cross section area of pile (m2)Ast= pile perimeter (m)li= length pile section i (m)fi= friction of pile section i= N (maximum 12 ton/m2, for silt/clay)= N/5 (maximum 10 ton/m2 for sand)Wp= selfweight of pileFK1, FK2= safety factor (3 and 5)

Dia. Of pile= 0,051 mCross section area= 0,002 m2Perimeter of pile= 0,160 mFK1= 3FK2= 5Table calculation pile capacity from N-SPT data (SH2)depth (m)li (m)Nsoil typeqc (t/m2)Ap (m2)Ast (m)fi (t/m2)lifi (ton/m)lifi (ton/m)Pall (ton)Pta (ton)

115C1000,0020,1605550,2270,117

2130C6000,0020,1601212170,9480,390

3,51,54C800,0020,16046230,7880,531

51,55C1000,0020,16057,530,51,0410,706

615C1000,0020,1605535,51,2010,822

9,33,39C1800,0020,160929,765,22,2031,502

Pile Capacity Calculation From Sondir at Sondir Number 1 With Guy Sangrelat Formula

Pa= allowable compress pile capacity (kg)Pta= allowable tension pile capacity (kg)qc= cone penetration (kg/cm2)Ap= cross section area of pile (cm2)Ast= pile perimeter (cm)Tf= total friction (accumulated) (kg/cm)Wp= selfweight of pile (kg)FK1, FK2= safety factor (3 and 5)Table calculation pile capacity from Sondir data (Sondir number 1)Depth (m)qc (kg/cm2)Tf (kg/cm)Ap (cm2)Ast (cm)Pall (ton)Pta (ton)

00020,26815,9590,0000,000

0,281220,26815,9590,0920,039

0,482420,26815,9590,1310,079

0,683620,26815,9590,1690,118

0,8124820,26815,9590,2340,157

1155720,26815,9590,2830,187

1,2307220,26815,9590,4320,236

1,4408720,26815,9590,5480,285

1,64010220,26815,9590,5960,333

1,84012220,26815,9590,6600,398

24014220,26815,9590,7230,463

2,213016220,26815,9591,3950,528

2,414018220,26815,9591,5270,593

2,615022220,26815,9591,7220,721

Pile Capacity Calculation Base Material QualityDia. Of pile= 0,051 mCross section area (Ap)= 20,27 cm2Compressive strength of concrete (fc)= 300 kg/cm2Without moment calculation pile capacity can calculate base on axial load. Compressive strength that allocated to receive axial load only 30% from total compressive strength.fc reduction= 300 kg/cm2 0,3= 90 kg/cm2Pile capacity= fc reduction Ap= 90 20,27= 1824,3 kg = 1,82 tonPile tension capacity calculate from strength of yield of rebar (dia. 25 mm)Tension capacity= As fy = 20,26 380 0,6= 4619,28 kg = 4,62 tonPile Capacity ResumeNoPile cap base onCompress Capacity (ton)Tension Capacity (ton)

1N-SPT data (SH2)1,200,82

2Sondir data (Sondir 1)1,720,72

3Material quality1,824,62

Pile capacity from N-SPT (SH2) have lowest result, so pile capacity use is 1,20 ton for compression and 0,72 ton for tension (single mini borepile).