****** dentical soil layers profile have the same thickness and under the same applying stress, but the first layer is two-way drainage and the second is one-way drainage, then ........ a) The final volume change of first layer is higher than the second b) The final time to complete consolidation for first layer is higher than the second c) The final time to complete consolidation for second layer is higher than the first d) The final volume change and time of first layer is higher than the second

****** dentical soil layers profile have the same thickness and under the same applying stress, but the first layer is two-way drainage and the second is one-way drainage, then ........ a) The final volume change of first layer is higher than the second b) The final time to complete consolidation for first layer is higher than the second c) The final time to complete consolidation for second layer is higher than the first d) The final volume change and time of first layer is higher than the second

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.17P

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Q: For the soil profile shown in figure. Determine the: a) Final consolidation settlement. b) Time (in month) required for 50% consolidation. c) Time (in month) required for the settlement to be (32) mm. d) Effective stress at the mid of the clay layer immediately after applying the load. e) Pore water pressure at the mid of the clay at the end of consolidation. f) Time (in month) required for full consolidation. g) value of maximum preconsolidation pressure (õp)at which the clay is considered as normally consolidated clay. Note: use yw= 10 kN/m³ Surcharge Aq.= 60 kPa El. 0 XXX Sand y= 15 kN/m³ El. -3 m Sand y= 17 kN/ m³ El. -6 m Clay Y. = 19.5 kN/m³ e = 0.81 C, = 1.5 m²/ yr O.C.R =1.6 C. = 0.15 C, = 0.02 El. -10 m Sand
The layer is subjected to a uniform vertical stress increase of 100 kPa. The singly-drained clay layer has a coefficient of consolidation of 20 ft2 /yr. Determine the value of the excess pore pressure at point A 2 years after the application of the load. Also given is the chart giving the local degree of consolidation. a)4.4 kPa b)44 kPa c)88 kPa d)96 kPa
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a) For the previous problem, calculate the OCR and OCM for the midpoint of the clay layerprior to fill placement. b) Calculate the settlement for the clay layer in the soil profile shown in problem 3, exceptassume the clay is normally consolidated. c) Calculate the settlement for the clay layer in the soil profile shown in problem 3, exceptassume the clay has a preconsolidation stress of 1800 psf. d) Assume the time to primary consolidation is 15 years,and the design life of the project is 50 years. What will the secondary compression of the claylayer be?
A) A soil mass above a certain depth becomes unstable when there is a negative effective stress at the depth (True or False) B) A soil’s effective stress is the sum of the soil’s total stress and its pore water pressure (True or False) C) The consolidation theory is usually applied to estimate a consolidation settlement for sandy soils (True or False)
Indicate all steps and answers I am studying for clss
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.
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)
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A normally consolidated clay layer is 4 m thick (one-way drainage). From the application of a given pressure, the total expected primary consolidation will be 80 mm. (A) What is the average degree of consolidation for the clay layer when the settlement is 30 mm, ( B) If the average value of Cv for the pressure range is 0.003 cm²/sec, how long will it take for 50% settlement to occur ?,(C) How long will it take for 50% consolidate to occur if the clay layer is drained at both top and bottom?
i. A sandstone core sample is saturated 100% with water. Calculate the absolute permeability of the core sample if the water is flowing at 6.21 cubic centimetres per second. The length of the core sample is 14 centimetres and its diameters is 6 centimetres. The pressure differential across the core sample is 15 atmospheric pressure and the water viscosity is 1.2 centipoises. Explain a method of how the permeability of low permeability reservoirs can be ii. improved.
a) Calculate the OCR and OCM for the midpoint of the clay layerprior to fill placement. b) Calculate the settlement for the clay layer in the soil profile shown in problem 3, exceptassume the clay is normally consolidated. c) Calculate the settlement for the clay layer in the soil profile shown in problem 3, exceptassume the clay has a preconsolidation stress of 1800 psf. d) Assume the time to primary consolidation is 15 years,and the design life of the project is 50 years. What will the secondary compression of the claylayer be? Answers3 1.45 ina) OCR = 4.06 OCM = 3014.8 lb/ft2b) 6.0 inc) 3.53 ind) 0.79 in