Soil Pile Capacity

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CALCULATION SPEC. : NO. SOIL BEARING & PILE CAPACITY REV. No : 0 PAGE : : Reference (PRINCIPLES OF FOUNDATION ENGINEERING, BRAJA M. DAS) 1) Boring Hole No BH-02 2) 2.620 D R I L L L O G 3) 1.800 0.00 4) Breadth of foundation 3.00 m 1.50 5) Length of foundation ( 3.00 m 3.00 6) 1.50 m 4.50 7) Allowable settlement ( 25.4 mm 6.00 8) Cohesion (c) 0.00 7.50 9) 33 deg 0.00 0.00 10) Average N-value (N) 17 0.00 11) Safty factor (FS) 3 10 20 30 40 50 Allowable capacity (qa 16.81 2. CORRECTED N-VALUE : By Peck & Bazaraa' Formula, 1969 1) depth 2) (m) 1.50 7 3.930 X Fill Materi 3) 3.00 10 7.860 O 9 Fill Materi 4.50 7 11.790 O 6 Fill Materi - 2.620 6.00 24 15.720 O 18 Residual So - 7.50 50 19.650 O 34 Residual So - 0.00 0 0.000 X - 0.00 0 0.000 X 0.00 0 0.000 X 1 17 3. ALLOWABLE SOIL BEARING CAPACITY 16.81 : Mayerhof's Formular 1. INPUT DATA (BORE HOLE NO. 2) Unit weight of soil (r ton/m 3 Unit weight of soil (r ton/m 3 Depth of foundation (D ton/m 2 Friction angle (φ) : Φ = √[20N] + 15 ( 19 ~ 45 deg.) ton/m 2 In case of σv' < 7.32 ton/m 2 Ncor = (4*NF) / (1+0.40984*σv') NF σv' Ncor In case of σv' > 7.32 ton/m 2 (ton/m 2 ) Ncor = (4*NF) / (3.25+0.13661*σv') In case of σv' = 7.32 ton/m 2 Ncor = NF Unit weight of soil (r ton/m 3 σv' : Effective stress (ton/m 2 ) NF : N-value in field Ncor : Corrected N-value average Ncor < 25 Allowable Bearing Capacity (q ton/m 2

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pile capacity sheet

Transcript of Soil Pile Capacity

data1N = [20N]+15NcNrNq11911913.934.685.8022122014.835.396.4032332115.826.207.0742442216.887.137.8252552318.058.208.6662662419.329.449.6072772520.7210.8810.6682882622.2512.5411.8592892723.9414.4713.201029102825.8016.7214.721130112927.8619.3416.441230123030.1422.4018.401331133132.6725.9920.631432143235.4930.2223.181532153338.6435.1926.091633163442.1641.0629.441733173546.1248.0333.301834183650.5956.3137.751934193755.6366.1942.922035203861.3578.0348.932135213967.8792.2555.962236224075.31109.4164.202336234183.86130.2273.902437244293.71155.5585.3825372543105.11186.5499.0226382644118.37224.64115.3127382745133.88271.76134.8828392939Vesic (1973)303931403240334134413541364237423843394340434144424443444445454546454746484649465047

21CALCULATIONSPEC.:NO.SOIL BEARING & PILE CAPACITYREV. No.:0PAGE:: Reference (PRINCIPLES OF FOUNDATION ENGINEERING, BRAJA M. DAS)1. INPUT DATA (BORE HOLE NO. 2)1)Boring Hole No =BH-022)Unit weight of soil (rs1) =2.620ton/m3D R I L L L O G3)Unit weight of soil (rs2) =1.800ton/m30.004)Breadth of foundation (B) =3.00m1.505)Length of foundation (L) =3.00m3.006)Depth of foundation (Df) =1.50m4.507)Allowable settlement (S) =25.4mm6.008)Cohesion (c) =0.00ton/m27.509)Friction angle () =33deg0.00: = [20N] + 15 ( 19 ~ 45 deg.)0.0010)Average N-value (N) =170.0011)Safty factor (FS) =31020304050Allowable capacity (qall) =16.81ton/m22. CORRECTED N-VALUE: By Peck & Bazaraa' Formula, 19691)In case of v' < 7.32 ton/m2Ncor = (4*NF) / (1+0.40984*v')depthNFv'Ncor2)In case of v' > 7.32 ton/m2(m)(ton/m2)Ncor = (4*NF) / (3.25+0.13661*v')1.5073.930X0Fill Material13)In case of v' = 7.32 ton/m23.00107.860O9Fill Material2Ncor = NF4.50711.790O6Fill Material3-Unit weight of soil (rs1) =2.620ton/m36.002415.720O18Residual Soil4-v' : Effective stress (ton/m2)7.505019.650O34Residual Soil0-NF : N-value in field0.0000.000X00-Ncor : Corrected N-value0.0000.000X000.0000.000X0041average Ncor < 25173. ALLOWABLE SOIL BEARING CAPACITYAllowable Bearing Capacity (qall) =16.81ton/m2: Mayerhof's Formular3.1 By Terzaghi's Formula, 1963qall = qu / FS = {(*c*Nc) + (*r1*B*Nr) + (r2*Df*Nq)} / FS =60.36ton/m2where,Unit weight of soil (r1) =2.620ton/m3Unit weight of soil (r2) =1.800ton/m3Df : Depth of foundation =1.50mB : Breadth of foundation =3.00mFactorSquareCircularStripRectangle : Shape factor =1.301.31.31.01.0+0.3x(B/L) : Shape factor =0.400.40.30.50.5-0.1x(B/L)c : Cohesion =0.00ton/m2Nc : Bearing factor =38.64(by Vesic)Nr : Bearing factor =35.19(by Vesic)Nq : Bearing factor =26.09(by Vesic)FS : Safty factor =3 : Friction angle =33deg3.2 By Bowle's Formula, 19771)In case of B 1.22mqnet(all) = 1.954*N*Fd*(S / 25.4) =Noneton/m22)In case of B 1.22mqnet(all) = 1.22*N*((3.28*B + 1) / (3.28*B))2*Fd*(S / 25.4) =29.45ton/m2where,N = Average S.P.T value =17S : Allowable settlement =25.4mmB : Breadth of foundation =3.00mDf : Depth of foundation =1.50mFd : Depth factor =1.17; 1+0.33(Df / B) =1.17< 1.333.3 By Mayerhof's Formula, 19561)In case of B 1.22mqnet(all) = 1.22*N =Noneton/m22)In case of B 1.22mqnet(all) = 0.815*N*((3.28*B + 1) / (3.28*B))2 =16.81ton/m2where,N = Average S.P.T value =17S : Allowable settlement =25.4mmB : Breadth of foundation =3.00m4. ELASTIC SETTLEMENT (Harr, 1966)Se = {(B*qo) / Es} * (1-s2) * r =16.9mm