6.14 A 5-m-thick clay layer, drained at the top only, has some sand drains. A uniform surcharge is applied at the top of the clay layer. Calculate the average degree of consolidation for combined vertical and radial drainage after 100 days of load application, given Cur = C, = 4 mm²/ min, de = 2m, and rw = 0.2m. Use the equal-strain solution.

6.14 A 5-m-thick clay layer, drained at the top only, has some sand drains. A uniform surcharge is applied at the top of the clay layer. Calculate the average degree of consolidation for combined vertical and radial drainage after 100 days of load application, given Cur = C, = 4 mm²/ min, de = 2m, and rw = 0.2m. Use the equal-strain solution.

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 11.8P

See similar textbooks

Related questions

Q: Q5): For the soil profile shown in figure, the piezometer reading at point (A) at time (t) after…

Q: For a laboratory consolidation test on a clay specimen (drained on both sides) the following results…

Q: Problem 5 A layered soil is shown in Figure P4.26. Estimate the equivalent permeability (cm/sec) for…

A: 4 layers of soil having different permeability is given z1 = z2 = z3 = z4 = 3 ftK1cm/s k2 = 2 ×…

Q: A surcharge of 250 kPa is applied over a large area above the soil profile shown below. The clay…

A: Settlement of clay after 40 days is 32.07mm.Explanation:

Q: A test well is to be constructed for dewatering purpose in a planned excavation for foundation. The…

A: To draw the spring and decide the boundaries, we first need to comprehend the idea of drawdown,…

Q: a consolidated drained trial test was conducted on a normally consolidated clay with majo minor…

Q: a. Determine the coefficient of consolidation for the load range in cm squared/min. b. Based on the…

Q: A large building is to be built on a thick layer of normally consolidated clay shown in the figure…

A: For the given soil profile, OCR is known as over-consolidation ratio. It is the ratio of…

Q: A consolidated-undrained test on a normally consolidate clay yield the following results: Confining…

Q: |!;9 ELABORATE Try solving the following problem: Practice Problem: The following are the results of…

Concept explainers

Consolidation parameters

Consolidation is the process of expulsion of pore water present in the voids of soil solids under the pressure of the applied load. This is a quick process in the case of coarse-grained soils since the permeability is high due to the presence of more voids, while it is a slow and gradual process in the case of clayey soil as the permeability of clay is less. An example of consolidation is the settlement of soil under a building due to the load coming from the building.

Question

**Problem Statement:**

A 5-m-thick clay layer, drained at the top only, has some sand drains. A uniform surcharge is applied at the top of the clay layer. Calculate the average degree of consolidation for combined vertical and radial drainage after 100 days of load application, given \( C_{ur} = C_v = 4 \, \text{mm}^2/\text{min}, \, d_c = 2 \, \text{m}, \) and \( r_w = 0.2 \, \text{m}. \) Use the equal-strain solution.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1: State the given data.

VIEW

Step 2: Calculate the average degree of consolidation

VIEW

Solution

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps with 3 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

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

Please solve from the given soil profile Thank you
The results of a laboratory consolidation test on a clay sample are given below: Pressure, p (kN/m²) Void ratio, e 23.94 1.112 47.88 1.105 95.76 1.080 191.52 0.985 383.04 0.850 766.08 0.731 (43) a) Draw an e-log p plot. (44) b) Determine the pre-consolidation pressure, p. . (45) c) Find the compression index, Ce. Appendix For ø=35°, N¸=57.8, N,=41.4, and N,=41.1. o,'=0;'tan²| 45°+ +2c tan| 45°+
Geotechnical
A 5-ft fill is to be placed over the following soil profile shown below. Determine if the clay is normally consolidated or over-consolidated. The pre-consolidation pressure (past maximum consolidation stress) of the clay is 1000 lb/ft3. 5 ft 2 ft 4 ft Proposed Fill, y = 120 lb/ft³ Sand Clay Rock 2 ft A Ydry = 100 lb/ft³ Ground water table Ysat 110 lb/ft³ = o'= Pc = 1000 lb/ft²
three samples of loose sand were tested under consolidated undrained conditions. test results are given below undrained angle of friction = 35 deviator stress = 260 kPa pore water pressure = 30 kpa a. determine the undrained confining pressure in kPa. round off to three decimal places b.determine the drained angle of friction in degress. round off to three decimal places c. determine the drained angle of inclination of failure plane in degrees.
A surcharge of 100 kPa is applied over a large area above the soil profile shown in the figure below. The water table is located at the ground surface. Calculate the settlement developed at the surface in mm when primary consolidation settlement is completed (acceptable tolerance = 2%). Use a single clay layer in your calculations.
A 3-m thick layer of saturated clay (two-way drainage) under a surcharge loadingunderwent 90% primary consolidation in 100 days. The laboratory test’s specimenwill have two-way drainage.a. Find the coefficient of consolidation of clay for the pressure range. b. For a 25 mm. thick undisturbed clay specimen, how long will it take to under-go 80% consolidation in the laboratory for a similar pressure range?
|!;9 ELABORATE Try solving the following problem: Practice Problem: The following are the results of a consolidation test on a sample soil: a. Plot the e-log o' curve b. Using Casagrande's method, determine the preconsolidation pressure. c. Calculate the compression index, Cc e 1.1 1.085 1.055 1.01 0.94 0.79 0.63 Pressure, o' (ton /ft²) 0.25 0.50 1.00 2.00 4.00 8.00 16.00
surcharge of 1000 lb/ft?? Assume C, = 1/6 C. 8.6 A soil profile is shown in Figure 8.23. The preconsolidation pressure is 3400 lb/ft?. Estimate the primary consolidation settlement that will take place as a result of a surcharge Ao = 1500 lb/ft. Assume C, = 1/5 C. %3D %3D Aa Dry sand 90=2 G, = 2.65 10 ft Groundwater table Sand 10 ft- G, = 265 Clay 10 ft W= 30% G,= 2.7 Liquid limit=35 Rock Figure 8.23 aning. All Rights Reserved. May not he copied, scanned or duplicated in whole or in Due to olectrIGK nhu scme third parry COnent may be suppressed inm the eBook andoreChupters
Q: For the soil profile shown in figure. Find: a) Final consolidation settlement. b) Time required for 60% consolidation. c) Pore water pressure after 18 months. d) Piezometer reading above point (A) immediately after applying the load. Surcharge Aq.= 100 kPa Sand y=15kN/m’ 7kN/ m® Piezometer t AT ol g thefity i
11.12 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 2014
A surcharge of 100 kPa is applied over a large area above the soil profile shown in the figure below. Calculate the degree of consolidation at Point A if the time factor Tv is equal to 0.2 (acceptable tolerance = 10%).