Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 5, Problem 5.8P
(a)
To determine
Find the primary consolidation settlement.
(b)
To determine
Find the magnitude of the temporary surcharge which does not cause post construction consolidation settlement.
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A 3.0 m thick singly drained normally consolidated claylayer has eo =0.89, Cc = 0.46, and cv =3.5 m2/year. Theeffective overburden pressure at the middle of the layeris 105.0 kN/m2. It is proposed to build a large warehousethat is expected to impose a pressure of 50.0 kN/m2 at theground level.
What would the primary consolidation settlement be?
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 total consolidation settlement considering primary and secondary settlement.
Select the correct response:
2.6425"
2.5631"
2.8866"
2.3856"
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
Chapter 5 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- Estimate the primary consolidation settlement in the clay layer. Given: Ao= 85 kN/m²; H1 = 2 m; H2 = 4 m; and H3 = 6 m. Soil characteristics are as follows: Sand: e = 0.65; Gs = 2.66 • Clay: LL = 54; e = 0.98; Gs = 2.74 ; Cs = 1/6 Cc.arrow_forwardCompressibililty: Consolidation and Settlement of Soil 500 kN 4m x 3m 3.5m Dry Sand = 15 kN/m Yary Sand Y = 17 kN/m³ 1.5m Clay = 19 kN/m Ysat e. = 1.0 LL = 50% 4.5m 2. Find the total consolidation settlement of the clay 4 years after the completion of primary consolidation settlement. The time for the completion of the primary consolidation settlement is 3 years. Ca = 0.020 (E; = 18 MPa, Poisson's Ratio = 0.20, I = 1.0)arrow_forwardFor a given consolidated clay: Gs= 2.71; LL= 45; In situ average effective overburden pressure = 120 kPa; In situ void ratio= 0.80 ; Thickness of clay layer = 4m ; average increase of effective stress on clay layer= 40 kPa; Effective pressure at the mid-height of clay layer= 60 kPa; Swell Index (Cs)= 1/5 Cc. Compute the primary consolidation settlement in mm. a.87.64 b.49 c.92.9 d.100.5arrow_forward
- 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 Sandarrow_forwardEstimate the primary consolidation settlement in the claylayer. Given: Δσ = 100 kN/m2; H1 = 4.0 m; H2 =5.5 m; and H3 = 9.5m. Soil characteristics are as Sand, e = 0.60; Gs = 2.55 Clay, LL = 60; e = 0.85; Gs = 2.65; σ'c = 200 kN/m2, Cs = 0.2 Cc Is there any difference if σ'c = zeroarrow_forwardA stratum of normally consolidated clay of thickness 10 ft is drained on one side only. It has a hydraulic conductivity of h = 1.863 x 10^-8 in/sec and a coefficient of volume compressibility mv = 8.6 x 10-^4 in2/lb. Determine the time required for 80% consolidation by assuming a uniformly distributed load of 5250 lb/ft2.arrow_forward
- 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"arrow_forwardThe soil is acted upon by a uniformly distributed load of 60 kPa at the ground surface. 60 kPa Yary = 16.5 kN/m^3 4 m Sand GWT Sand 8 m Y= 18.0 kN/m^3 Yeat =20.0 kN/m^3 6 m Clay e=0.85 LL = 48% 1. Compute the settlement of the clay layer caused by primary consolidation if the soil is normally consolidated. [ Select ] 2. Compute the settlement of the clay layer caused by primary consolidation if the preconsolidation pressure of clay is 230 kPa. Use Cs = Cc/5. [Select ] 3. Compute the settlement of the clay layer caused by primary consolidation if the preconsolidation pressure of clay is 200 kPa. Use Cs = Cc/5. [ Select ]arrow_forwardSurcharge, Aq-50 kN/m Sand 3 m Groundwater table V Tary-16 kN/m Sand 6m TR-18.5 kN/m Clay Tie-19 kN/m Void ratio, e=0.95 LL-50 6 m Sand FIGURE 02C)arrow_forward
- The following technical data are given below: Overburden pressure = 180KPa Increase in pressure = 140KPa Clay thickness = 8m Compression Index = 0.315 Void ratio = 1.132 What is the total settlement in clay?arrow_forwardIn a reclamation project, the middle of a clay layer is under an initial effective vertical stress of 200 kPa and initial void The clay is ratio (eo) of 0.90. overconsolidated with OCR of 1.4, compression index of 0.34 and expansion index of 0.07. With an applied load of 299 kPa, what will be the final void ratio (e1) for the clay?arrow_forwardFor a given consolidated clay: Gs= 2.71; LL= 45; In situ average effective overburden pressure = 120 kPa; In situ void ratio= 0.80 ; Thickness of clay layer = 4m ; average increase of effective stress on clay layer= 40 kPa; Effective pressure at the mid-height of clay layer= 60 kPa; Swell Index (Cs)= 1/5 Cc. Compute the pre-consolidation pressure in kPa. Show free body diagram a.92.9 b.100.5 c.49 d.87.64arrow_forward
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