Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 11, Problem 11.4P
(a)
To determine
Find the primary consolidation settlement of the clay layer.
(b)
To determine
Find the time required for 90% of primary consolidation settlement.
(c)
To determine
Find the temporary surcharge required to eliminate the primary consolidation settlement in 6 months.
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Students have asked these similar questions
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/m2
2m
Yary
= 14 kN/m
Groundwater table
4 m
Yuat18 kN/m
Kat 19 kN/m
Void ratio, e 0.8
35m
LL 40
Sand Clay
What is the settlement (in mm) of the clay layer caused by primary consolidation if the
clay has a preconsolidation pressure of 200 kPa?
Report your answer to the nearest whole number.
О 38
O 68
O 190
O none of the above
The old building (A) is to be removed and replaced by a new building (B), as shown in the Figure.
The vertical pressure at the centre of the clay layer from the building (A) and building (B) is equal to
13.64 kN/m and 23.3 kN/m² respectively. Find:-
1. O.C.R after removing building (A). (Ans: OCR =1.198)
2. The void ratio (e) of the clay layer immediately after removing building (A). (e = 0.7977)
3. Time required to achieve half the final consolidation settlement of building (B). (25.09 years)
Old building (A)
2m
Sand, Yary= 15 kN/m?
W.T.
Clay
Yat - 20 kN /m, e, - 0.81
C- 0.2, C, = 0.04, c, = 0.5 m²/yr
8m
Rock
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
Chapter 11 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- Soil mechanicsarrow_forwardEstimate 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_forward1. 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_forward
- Refer 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_forwardRefer to Figure below. Estimate the primary consolidation settlement in the clay layer. Given: Δσ = 150 kN/m2; H1 = 3 m; H2 = 4 m; and H3= 5 m. Soil characteristics are as follows: • Sand: γdry = 15 kN/m3, γsat = 19 kN/m3 • Clay: LL = 65; e = 0.65; γsat = 18 kN/m3; ; Cs =1/6cc σʹc = 200 kN/m2arrow_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_forward
- 3. Please I want answer of this question. Thanks Note: Y = 8arrow_forwardThe 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.arrow_forwardQ5: 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_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_forwardH.W1: For the raft foundation with dimensions of 20 mx20 m shown in the figure, determine the immediate and consolidation settlement of the clay layer. V = 80 MN W.T 2 m Raft (20 mx20 m) eo=0.9 eF0.8 E=10 MPa 4 m Clay v=0.45 Ysat.= 20 kN/m³ Sand Hint: Ae = e, - efarrow_forward11.12 A 2-m clay layer in the field has a current effective stress, o= 70 kN/m. There is a net stress increase, Ao = 180 kN/m², due to a foundation load. Calculate the expected primary consolidation settlement. The results of a consolidation test on the clay are given below. o' (kN/m?) e 0.98 12 0.94 50 0.82 200 0.73 400 © Cengage Leaming 2014arrow_forward
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