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Lec4_Piled Raft

Settlement (mm)

Settlement (mm) 20-Oct-15 Determination of Soil Modulus (Es) Based on plate load tests (As per IS – 2950, Part 1, 1981 (Reaffirmed1998): ‣ E s = q B 1− μ 2 s I w E s = Modulus of elasticity (Soil modulus) q = Intensity of contact pressure B = Least lateral dimension of test plate S = Settlement μ = Poisson’s ratio I w = Influence factor, = 0.82 for a square plate Prof. V.S.Raju Consultants 23 Field determination of Es based on footing load test conducted at “Delhi International Airport (DIAL)”: Soil type = Sandy silt SPT N = 50 Size of footing = 1.5 m x 1.5 m For q = 40 t/m 2 = 4 Kg/cm 2 , Settlement (S) = 4 mm E s = 4 ∗ 150 1− 0.3 2 0.4 * 0.82 1 st Footing load test: Load Vs Settlement Curve for DIAL FLT 1 0 10 20 30 40 50 60 70 80 90 0 5 10 15 Load Intensity (t/m 2 ) = 1119 Kg/cm 2 As per Shultze and Muhs for SPT N = 50 Es = 800 Kg/cm 2 20 25 Ratio = 1119/800 = 1.4 Prof. V.S.Raju Consultants 24 V.S.Raju Consultants 12

Settlement (mm) 20-Oct-15 Results from DIAL Project: 2 nd Footing load test: Type of soil = Clayey silt with fine sand SPT N = 22 Size of footing = 1.5 m x 1.5 m q = 38 t/m 2 = 3.8 Kg/cm 2 Load Vs Settlement Curve for DIAL FLT 2 Load Intensity (t/m 2 ) 0 10 20 30 40 50 60 70 80 0 Settlement (S) = 5.4 mm 5 E s = 3. 8 ∗ 150 = 787 Kg/cm 2 Prof. V.S.Raju Consultants 1− 0.3 2 0.54 * 0.82 As per Shultze and Muhs for SPT N = 22 Es = 530 Kg/cm 2 Ratio = 787/530 = 1.48 10 15 20 25 25 S. No SPT N Es as per Bowles book Es as per IS Code Es as per Schultze and Muhs From Footing Load test at DIAL 1 50 325 820*** 800 1119 2 22 185 710 +++ 530 787 Note: All E s values are in kg/cm 2 (multiply by 100 for Kpa) E s values calculated from Bowles book are for corrected N values. ***However, for the same N value at a depth of 8 m, the E s value would be only 400 kg/cm 2 as per IS. +++ However, for the same N value at a depth of 8 m, the E s value would be only 320 kg/cm 2 as per IS. Prof. V.S.Raju Consultants 26 V.S.Raju Consultants 13

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