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: 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. Estimate the secondary compression in each layer? What will be the total settlement after 2 years? Determine the effective stress at point A three months after the application of the fill loads. Fill load (kN/m2)2 mSilty'sand2 m4 mClay2 mPeatDense sandđLayerC.C.c, (cm²/sec)Clay0.360.030.0031.1Peat6.60.2630.0255.9

Consolidation settlement is the method that the volume of soil is decreased by the removal of water…

Answered: soil profile as shown with a silty sand…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A soil profile as shown with a silty sand (ѵ = 15 kN/m³; ѵ_sat = 17 kN/m³) underlain by high- plasticity clay (ѵ_sat = 17 kN/m³) and a peat layer (ѵ_sat = 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.
Estimate the secondary compression in each layer?
What will be the total settlement after 2 years?
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

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