Question

7) (Total 20 pts) The figure shows a 20 m thick layer of normally consolidated clay (Y -18.6 kN/m3) that is one-dimensionally loaded by Δσ,-50kPa. The clay layer is below a 3 m thick layer of granular fill (y = 19.6 kN/m3), and a dense, compacted glacial till (impermeable) underlies the clay. The water table is located at the top of the clay layer. A 1-D consolidation test is performed on a 2.20 cm thick, doubly drained specimen from the middle of the clay layer. When the stress conditions from the field (including the Δσ.-50 kPa) are applied to this specimen, it takes 1 minute for 50% average consolidation to occur. a) From the lab test data, determine c, for the soil. (5 pts) b) Compute effective stress at 18 m depth below surface (15m into the clay layer) 4 years after the Δσν is applied to the clay layer. (10 pts) Compute the average degree of consolidation 4 years after Δσν application. (5 pts) c) 50 kPa 3 m Granular fill,ly -19.6 kN/m Clay, 18.6 kN/m3 20 m Dense glacial till

0 0
Add a comment Improve this question Transcribed image text
Answer #1

3m fill, Glay 2 2 a given Laboratory test dada, 50kPa H = 2-20 cm thick = 2:2x10 m double drainage time = 1 minute 50/- Conso

Add a comment
Know the answer?
Add Answer to:
7) (Total 20 pts) The figure shows a 20 m thick layer of normally consolidated clay...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions
  • A 2-m thick of compacted soil of unit weight 20 kN/m3 will be placed on the top of the ground surface. Δσ y...

    A 2-m thick of compacted soil of unit weight 20 kN/m3 will be placed on the top of the ground surface. Δσ y 14.0 kN/m3 3.0 m Sand Y 17.5 kN/m3 2.0 m 3.0m A Soft clay y= 13.5 kN/m3 6.0 m Medium clay y=15.0 kN/m3 B 4.0 m Bedrock a) Before placing the compacted soil, what are the overconsolidation ratios (OCR) for point A and B? b) When placing the compacted soil, what external load Ag would be? c)...

  • 1. An 8-m thick normally consolidated clay layer is doubly drained as shown below. (This means...

    1. An 8-m thick normally consolidated clay layer is doubly drained as shown below. (This means that a very pervious layer compared to the clay exists on top of and under the clay layer) The embankment applied an average vertical stress increase of 100 kPa to the clay layer. The water table is located at the mid depth of the sand layer. Assume the sand above the water table is dry 0 Pore water pressure, u (kPa) 20 40 60...

  • Question 4 (20 marks): A 2-m thick normally-consolidated clay soil is resting on impermeable shale rock;...

    Question 4 (20 marks): A 2-m thick normally-consolidated clay soil is resting on impermeable shale rock; a 20-m thick layer of sandy soil is placed on top of the clay to expedite consolidation process. The unit weight of the sand is 15 kN/m3 and the unit weight of the clay is 10 kN/m3. For the clay layer, the initial void ratio is 2.0, the compression index of the clay is Ce 0.40, the recompression index is C, - 0.10, and...

  • Example 2:3 The soil profile at a site consists of a 3 m thick sand layer...

    Example 2:3 The soil profile at a site consists of a 3 m thick sand layer (Ybulk -16.5 kN/m3 sat18.5 kN/m3) underlain by a 6 m thick clay layer (w-27%, Gs-270, m,-0.31 MPa", cv-2.6 m2/year), which is underlain by a gravel layer. A 3 m compacted fill with a unit weight of 20 kN/m3 is to be placed at ground level. a. What would be the final consolidation settlement? b. How long will it take for 50 mm of consolidation...

  • Problem 7 The soil profile at a site consists of a top 4 m layer of...

    Problem 7 The soil profile at a site consists of a top 4 m layer of dense sand followed by 2 m of clay, which is underlain by a stiff stratum. The water table is at 2 m below the ground level. The following data was obtained from a consolidation test on an undisturbed sample obtained from the middle of the clay layer: water content 5 36%, specific gravity of the clay grains = 2.72, compression index = 0.72, recompression...

  • geotechnical engineering The soil profile at a site consists of a clay layer 10 m thick,...

    geotechnical engineering The soil profile at a site consists of a clay layer 10 m thick, sandwich between two sand layers. The top sand layer has a density of 1.9 Mg/m² and is 5 m thick. Below this layer is a 10 m thick clay layer with a saturated density of 1.8 Mg/m' and a saturated water content 42%. The deeper sand layer has a saturated density of 1.9 Mg/m² and extend to the depth investigated at the site. The...

  • solve Question 8. please show steps [Problems 7-8] A 12 m thick layer of Omaha clay...

    solve Question 8. please show steps [Problems 7-8] A 12 m thick layer of Omaha clay is double drained. (This means that a very pervious layer compared to the clay exists on top of and under the 12 m clay layer). The coefficient of consolidation is Cy = 8.0 x 10-8 m²/s. Problem 7. Estimate the degree of consolidation for the clay layer 5 years after loading at the depth of 6 m. (1) 32% (2) 46% (3) 61% (4)...

  • The time for 50% consolidation of a 25 mm thick clay specimen (drained at top and bottom) in the laboratory is 1...

    The time for 50% consolidation of a 25 mm thick clay specimen (drained at top and bottom) in the laboratory is 150 sec. How long (in days) will it take for a 3 m thick layer of the same clay in the field under the same pressure increment to reach 75% consolidation? There is an impermeable shale layer at the bottom of the clay layer in the field I. 2. Use Figure 1 for the following Compute the vertical effective...

  • The ground profile of a construction site consists of a 3 m thick layer of sand...

    The ground profile of a construction site consists of a 3 m thick layer of sand followed by a 2 m thick layer of clay lying on impervious bedrock. The water table is at a depth of 2 m below the ground surface. The sand has a dry unit weight of 16 kN/m3 and a saturated unit weight of 18 kN/m3. The capillary rise in the sand is 0.5 m. The clay has a bulk unit weight of 19 kN/m3....

  • Two undisturbed clay samples were taken from the middle of the overconsolidated and normally consolidated clay layers in the soil profile shown. The water table is at the top of the overconsolidated c...

    Two undisturbed clay samples were taken from the middle of the overconsolidated and normally consolidated clay layers in the soil profile shown. The water table is at the top of the overconsolidated clay layer. Consolidation tests were carried out on the two samples and the results are summarized in the table below. Assume that the bulk, dry, and saturated unit weights of the sand are 16 kN/m3, 16 kN/m3 and 19 kN/m3, respectively. The specific gravity of the clay soil...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT