soil profile as shown with a silty sand (ѵ = 15 kN/m3; ѵsat = 17 kN/m3) underlain by high- plasticity clay (ѵsat = 17 kN/m3) and a peat layer (ѵsat = 16 kN/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:        Estimate the total consolidation settlement under the action of the fill load? Consider both the clay and peat   layers to be normally consolidated. Estimate the time for 99% primary  consolidation in each layer. Are the   layers singly or doubly drained? Explain.

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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A soil profile as shown with a silty sand (ѵ = 15 kN/m3; ѵsat = 17 kN/m3) underlain by high- plasticity clay (ѵsat = 17 kN/m3) and a peat layer (ѵsat = 16 kN/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 loads.  
Fill load (kN/m2)
2 m
Silty'sand
2 m
4 m
Clay
2 m
Peat
Dense sandđ
Layer
C.
C.
c, (cm²/sec)
Clay
0.36
0.03
0.003
1.1
Peat
6.6
0.263
0.025
5.9
Transcribed Image Text:Fill load (kN/m2) 2 m Silty'sand 2 m 4 m Clay 2 m Peat Dense sandđ Layer C. C. c, (cm²/sec) Clay 0.36 0.03 0.003 1.1 Peat 6.6 0.263 0.025 5.9
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