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## Question:

Foundation engineers are often challenged by the existence of soft compressible soils at the  construction  site. The   a soil  profile with a  silty  sand  (?=  15  kN/m3; ?sat=17 kN/m3) underlain by high?plasticity clay (?sat=17 kN/m3) and a peat layer (?sat=16kN/m3), followed  by  dense  sand.  To  expedite  consolidation  and  minimize  future  settlement, an  additional 2?m?thick fill material, compacted to a unit weight of 19 kN/m3, will be placed on top of the silty sand layer. The plan area of the fill is 10 m X 10 m. The fill load will be left in place  for  2  years,  after  which  construction will  begin  with  the  fill  becoming  part  of  the  permanent foundation. Undisturbed samples collected from the clay and organic layers had the following properties:

1. Estimate the total consolidation settlement under the action of the fill load. Consider both the clay and peat layers to be normally consolidated.
2. Estimate the time for 99% primary consolidation in each layer. Are the layers singly or doubly drained? Explain.
3. Estimate the secondary compression in each layer.
4. What will be the total settlement after 2 years?
5. Determine the effective stress at point A three months after the application of the fill load.

Question 4:
Calculate the settlement of the 3?m thick clay layer (see the following figure) that will result from the load (Q=4000 kg) by a 2?m square footing. The clay is normally consolidated. Using the weight average method to calculate the average increase of effective pressure in the clay layer.
The weight average method is

Question 5:
The results of a standard proctor test are given in the following table.
1. Determine the maximum dry unit weight of compaction and the optimum moisture content. Given: mold volume=953.3 cm3.
2. Determine the void ratio and the degree of saturation at the optimum moisture content. Given: Gs=2.68.

### Cite This Work

[Accessed 21 April 2021].

My Assignment Help. Advanced Geotechnical Engineering [Internet]. My Assignment Help. 2021 [cited 21 April 2021]. Available from: https://myassignmenthelp.com/free-samples/7308eng-advanced-geotechnical-engineering/fill-load.html.

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