During the construction of a highway bridge, the average permanent load on the clay layer is expected to increase by about 115 kN/m². The average effective overburden pressure at the middle of the clay layer is 210 kN/m². Here, H = 6 m, Ce = 0.28, ep = 0.9, and cv = 0.36m²/mo. The clay is normally consolidated. a. Determine the total primary consolidation settlement of the bridge without precompression.

During the construction of a highway bridge, the average permanent load on the clay layer is expected to increase by about 115 kN/m². The average effective overburden pressure at the middle of the clay layer is 210 kN/m². Here, H = 6 m, Ce = 0.28, ep = 0.9, and cv = 0.36m²/mo. The clay is normally consolidated. a. Determine the total primary consolidation settlement of the bridge without precompression.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter11: Ground Improvement

Section: Chapter Questions

Problem 11.6P

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During the construction of a housing project, it is estimated that the average permanent load on a clay layer located at 6 m below ground surface will increase by about 200 kPa. The average effective overburden pressure at the middle of the 4.5 m thick clay is 100 kPa. The result from soil sample testing givens the consolidation parameters eo = 0.96, Cc = 0.45, Cv = 2.5 m2/year, and the clay is in www normally consolidated condition. Estimate the total consolidation settlement that will happen and the time taken to achieve 90% consolidation stage.
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.
Compressibililty: 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)
Surcharge, 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)
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A normally consolidated clay layer 3 m thick has a void ratio of 1.10. Liquid limit is equal to 40 and the average effective stress on the Clay layer was 80 Kpa The average stress on it is increased to 120 Kpa as a result of construction of a foundation. a. Compute for the consolidation settlement that will occur on the clay layer b. Compute for the consolidation settlement that will occur on the clay layer if preconsolidation pressure is 96Kpa. c. Compute for the consolidation settlement that will occur on the clay layer if preconsolidation pressure is 130 KPa.
A normally consolidated clay layer of 4 m in thikness has overburden stress of 96.7 kPa and final effective stress of 154.3 kPa. If Cr = 0.22 and void ratio = 1.1 the consolidation settlement would be: %3D O A. 173.0 mm O B. 178.3 mm O C. 172.3 mm O D. 175.3 mm QUESTION 12 The liquid and plastic limits of a clay are 48% and 23% respectively. The specific gravity is 2.7. Estimate the following: - Cc - Cr Then select the correct answers. O A. Cc = 0.33 Cr = 0.66 O B. Cc = 0.34 Cr = 0.06 O C. Cc = 0.30 Cr = 0.16 O D. Cc = 0.06 Cr = 0.34
3. A 405 cm³ volume of fully saturated clay weights 8.1 N and the specific gravity of the solids is 2.70. Given the liquid limit and the plastic limit of the clay are LL (w₁) = 40% and PL (wp )= 10.5%, respectively. (1) Find the plasticity index PI of the clay. (2) What is the liquidity index of the clay? (3) Do you expect a brittle type of failure of this soil? Why?
An oedometer test on a saturated clay soil gave the following results: Cc = 0.2 and Cs = 0.04. The in-situ vertical effective stress in the field is 130 kPa. A building foundation will increase the vertical stress in the center of the clay by 150 kPa. The thickness of the clay layer is 2 m and its water content is 28%. Calculate the primary consolidation settlement of the clay layer in the field if: a). OCR = 4.5; b). OCR = 1.5.
2- An undisturbed clay has a preconsolidation pressure of 200 lb/ft. A laboratory consolidation tests yield the following data: o' (lb/ft') e 0.92 3,130 6,270 0.77 a) Determine the void ratio that corresponds to a pressure of 5,800 (Ib/ft). b) Determine the coefficient of volume compressibility for the pressure range stated. c) If C, = 1 x 10* in?/sec, determine hydraulic conductivity, k in in/sec corresponding to the average void ratio within the pressure range.
The laboratory consolidation data for an undisturbed clay specimen are as follows: e1 = 1.12 P₁ = 90 kPa e2 = 0.90 P2 = 450 kPa 1. Compute the value of the compression index. 2. Compute the value of the swell index assuming it is equal to 1/6 the value of the compression index. 3. Compute the void ratio for a pressure of 600 kPa. 4. Compute the coefficient of compressibility. 5. Compute the value of the coefficient of volume compressibility.