Q.3. Calculate the total primary consolidation settlement of the soil layres as showr Figure Q3 below. ( 607 )kN EGL Sand Y = 18 kN/m 2m 2 m x 3 m 1 m Assume, Ysat = 18.5 kN/m³ C. = (1/6) Cc for both layers Clay layer-1 eo = 0.92 2 m Cc = 0.154 OCR=1 Silty Sand layer, Ysat = 19 kN/m³ Ysat = 19.5 kN/m³ eo = 0.564 Cc = 0.104 Clay layer-2 3 m OCR=1.6 Pervious Rock layer Figure Q3: Soil Layers E

Q.3. Calculate the total primary consolidation settlement of the soil layres as showr Figure Q3 below. ( 607 )kN EGL Sand Y = 18 kN/m 2m 2 m x 3 m 1 m Assume, Ysat = 18.5 kN/m³ C. = (1/6) Cc for both layers Clay layer-1 eo = 0.92 2 m Cc = 0.154 OCR=1 Silty Sand layer, Ysat = 19 kN/m³ Ysat = 19.5 kN/m³ eo = 0.564 Cc = 0.104 Clay layer-2 3 m OCR=1.6 Pervious Rock layer Figure Q3: Soil Layers E

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A CU triaxial test was carried out on a silty clay that was isotopically consolidated using a cell pressure of 125 kPa. The following data were obtained: Axial load (kPa) 0 5.5 11.0 24.5 28.5 35.0 50.5 85.0 105.0 120.8 Axial strain, E₁ (%) 0 0.05 0.12 0.29 0.38 0.56 1.08 2.43 4.02 9.15 Au (kPa) 0 4.0 8.6 19.1 29.3 34.8 41.0 49.7 55.8 59.0 (a) Plot the deviatoric stress vs. axial strain and excess porewater pressure vs. axial strain, respectively. (b) Determine the undrained shear strength (su). (Note: we assume that the sample reaches failure). (c) Determine the total principal stresses (0₁,03) and the effective principal stresses (0₁, 03') at the failure, respectively.
For soil profile shown in Figure below. If the clay is normally consolidated, a) Estimate the consolidation settlement under the 5 m diameter circular footing, and comment on the result. b) How long will it take for 25 mm of consolidation settlement (in months)? P = 5000 kN y = 17 kN/m³ Ysat Sand 19 kN/m³ = Clay Ysat = 20 kN/m³ Cc = 0.32, e = 0.8 Cv C₂ = 2.6 m² year-1 Bed rock W.T E 6 m 6 m
A 3.75m clay layer in the field (drained on one side) is normally consolidated. When the pressure is increased from 50 kPa to 150 kPa, the void ratio decreases from 0.9 to 0.75. The coefficient of permeability of the clay was 6 x 10^-7 cm/s.• How long (days) will it take to reach 50% consolidation?• What is the settlement when the soil reaches 50% consolidation?Final answer should be in 3 decimal places.
For a normally consolidated clay layer in the field, the following values are given: Thickness of clay layer = 8.5 ft Void ratio = 0.8 • ● Compression index (Cc) = 0.28 Average effective pressure on the clay layer is 2650 lb/ft² Additional Overburden Pressure is 970 lb/ft² Secondary compression index (Ca) is 0.02 Determine the secondary compression settlement of the clay layer five years after the completion of primary consolidation settlement? (Note: Time for completion of primary settlement is 3 years.) Select the correct response: 0.7621" 0.4932 0.2363" 0.5524"
surcharge of 1000 lb/ft?? Assume C, = 1/6 C. 8.6 A soil profile is shown in Figure 8.23. The preconsolidation pressure is 3400 lb/ft?. Estimate the primary consolidation settlement that will take place as a result of a surcharge Ao = 1500 lb/ft. Assume C, = 1/5 C. %3D %3D Aa Dry sand 90=2 G, = 2.65 10 ft Groundwater table Sand 10 ft- G, = 265 Clay 10 ft W= 30% G,= 2.7 Liquid limit=35 Rock Figure 8.23 aning. All Rights Reserved. May not he copied, scanned or duplicated in whole or in Due to olectrIGK nhu scme third parry COnent may be suppressed inm the eBook andoreChupters
Н.W 1. For the one-dimensional consolidation test result shown in Figure below, determine my. 1.0 0.9 0.8 Void ratio 0.7 0.6 0.5 0.4 10,000 Vertical effective stress (log scale) - psf 100 1000 100,000 2- The following readings were taken for an increment of vertical stress of 400 psf in a one-dimensional consolidation test on a saturated clay sample 3 in diameter and 0.75 in thick. Drainage was permitted from the top and bottom boundaries. Determine the coefficient of consolidation using the root time method. Time (min) 0.25 ΔΗ (in) 1 2.25 4 9. 16 25 36 64 144 24 hours 0.0047 0.009 0.0133 0.0169 0.023 0.0268 0.0291 0.03 0.032 0.033 0.035
Q5: Figure below shows a soil profile. The uniformly distributed load on the ground surface is Ao. Estimate the primary consolidation settlement of the clay layer given these values: HI = 1.5 m, H2 = 2 m, H3 = 2.5 m Sand: e = 0.62, Gs 2.62 Clay: e = 0.98, Gs = 2.75, LL = 50 Ao = 110 kN/m2 Sand Groundwater table Sand Clay Void ratio =e Hy Normally consolidated Sand
I For soil profile shown in Fig. Calculate the amount of ultimate consolidation settlement( 2 m 0.5 m 3.5 m W.T Q=2000 KN 6 m - 3 m y=22 kN/m² Ce=0.805 C₁ = 0.3 e=0.753 OCR = 1.4 G. s Dense Sand Y = 22 kN/m³ Silty Clay Silty Sand y = 18 kN/m²
Given the following data for the normally consolidated clay layer in the field. Compute the primary consolidation settlement. Thickness of clay layer= 3.0m Cc= 0.30 e= 0.70 Overburden pressure= 250 Kpa ΔP= 46 kPa Cα= 0.022
Refer to Figure Q3. Estimate the primary consolidation settlement in the clay layer. Given: Δ? = 85 ??/?2 ?1 = 2 ? ?2 = 4 ? ?3 = 6 ?. Soil characteristics are as follows (use appropriate relations):• Sand: ? = 0.65; ?? = 2.66• Clay: ?? = 54;? = 0.98; ?? = 2.74; ?'c = 150 ??/?2; ?? = 1/6 ?c
Use unit weight of water = 10kN/m3 in the following questions. A soil profile is shown in Figure Q2(c). If a uniform distributed load of 50 kN/m2 is applied at the ground surface, compute the average settlement of the clay layer caused by primary consolidation if; i)Determine the existing overburden effective stress at mid of clay layer ii) Settlement in clay if, the clay is normally consolidated, given Cc = 0.0085(LL-10) iii) Settlement in clay if, the preconsolidation pressure, pc’=200 kN/m2, given Cr=1/5Cc. Use Cc obtained in part (ii).
A soil profile is shown in the figure below. A uniformly distributed load, Ao ; is applied at the ground surface equal to 100 kPa. Ao 100 kN/m 2m Yary - 14 kN/m Groundwater table 4 m Yat 18 kN/m Kat 19 kN/m Void ratio, e=0.8 3.5 m L=40 Sand E Clay What is the settlement (in mm) of the clay layer caused by primary consolidation if the clay is normally consolidated? Report your answer to the nearest whole number. O 68 O 190 O 38 O none of the above