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 5.10P
(a)
To determine
Find the primary consolidation settlement.
(b)
To determine
Find the required duration for the preload surcharging.
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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.
If the engineer proposes to preload the site with a pressureof 90.0 kN/m2, how long should this surcharge beleft to ensure there is no postconstruction settlementwhen the warehouse is built?
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.
The saturated NC clay is 8 meters deep. The moisture content is 40% and the specific gravity is
2.5. If we know that loading increased the effective stress in the middle of the layer by 270 kpa,
then answer the following questions. (cc = 0.2, Cs = 0.05)
1. Calculate the settlement after the consolidation.
2. Calculate the void ratio after consolidation.
3. Calculate the volume compressibility coefficient in terms of Kpa
4.
If we unload the load that we applied, calculate the swelling and final void ratio.
5.
If the effective stress increases after loading the soil again by 570 Kpa in the middle of the
soil layer, calculate the consolidation settlement.
Chapter 5 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- 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= 0.022arrow_forwardA layer of soft clay 4 m thick under construction building, the overburden pressure over the center of the clay layer is 300 kPa, Cc = 0.5, G = 2.7, w = 50%. Final consolidation settlement if the increase in pressure due to construction of 100 kPa Pease answer correct and fast but no wrong answerarrow_forwardFor 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"arrow_forward
- 1. A soil profile is shown in the figure.A uniformly distribute d load of 50 Kpa is applied at the ground surface. Assume Cs= 1/5 Cc. What is the settlement of the clay layercaused by primary consolidation if: a. The clay is normally consolidate d b. The preconsolidation pre ssure, de= 210 Kpa c. The preconsolidation pressure, o.= 150 Kpa Ap = 50 kPa Sand 3 m Yay = 16 kN/m? Ground water table 6 m Sand Ya = 18.5 kN/m Clay Yar = 19 kN/m e = 0.95 LL = 50 8 m Sand Figure 06.4arrow_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 (eo) = 0,8 Compression index (C.) = 0.28 • Average effective pressure on the clay layer (ob) = 2650 lb/ft • Ao' = 970 lb/ft? • Secondary compression index (C.) = 0.02 What is the total consolidation settlement of the clay layer five years after the completion of primary consolidation settlement? (Note: Time for completion ofarrow_forwardWeight of structure W.T. Sand layer H2 Clay layer Н as Compacted sand- gravel layer figure 1arrow_forwardRefer to Figure 2, estimate the primary consolidation settlement in the clay layer. Given: Ag = 85 kN/m²; Hi = 2 m; H2 = 4 m; and H3= 6 m. Soil characteristics are as follows: Sand: ydx 14 kN/m³, Ysat 18 kN/m³ Clay: LL = 54; e = 0.98; Ysat 19 kN/m'; Cs =- Cc 150 kN/m? H3 Sand Clay ョ→arrow_forward
- Estimate the primary consolidation settlement of the clay. Assume the soil above the water table to be saturated, Cc = 0.3, and Gs = 2.7arrow_forwardThe 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_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
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