A 5m thick saturated soil stratum has a compression index of 0.25 and coefficient of permeability 3.2x10 3 mm/sec. if the void ratio is 1.9 at vertical stress of 0.15 N/mm2, The void ratio when the vertical stress is increased to 0.2 N/mm2. Choose... The consolidation settlement (mm) due to stress increase of 0.2 N/mm2 is: Choose...

A 5m thick saturated soil stratum has a compression index of 0.25 and coefficient of permeability 3.2x10 3 mm/sec. if the void ratio is 1.9 at vertical stress of 0.15 N/mm2, The void ratio when the vertical stress is increased to 0.2 N/mm2. Choose... The consolidation settlement (mm) due to stress increase of 0.2 N/mm2 is: Choose...

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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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

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A 5m thick saturated soil stratum has a compression index of 0.25 and coefficient of permeability 3.2x103
mm/sec. if the void ratio is 1.9 at vertical stress of 0.15 N/mm2,
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The void ratio when the vertical stress is increased to 0.2 N/mm?.
Choose...
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The consolidation settlement (mm) due to stress increase of 0.2 N/mm2 is:
Choose...
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The layer is subjected to a uniform vertical stress increase of 100 kPa. The singly-drained clay layer has a coefficient of consolidation of 20 ft2 /yr. Determine the value of the excess pore pressure at point A 2 years after the application of the load. Also given is the chart giving the local degree of consolidation. a)4.4 kPa b)44 kPa c)88 kPa d)96 kPa
The void ratio of 4 m thick consolidated clay is 1.3. The compression index and coefficient of consolidation of the clay is 0.6 and 1m2/year respectively. It is observed that the increase in vertical pressure is equal to the effective overburden pressure. Determine the change in the thickness of the clay layer (in mm).
ASAP
Example 9.2: A clay soil, tested in a consolidometer, showed a decrease in void res •m 1.20 to 1.10 when the presure was increased from 0.25 to 0.50 kgflem?. Calculate to. efficient of compressibility (a) and the coefficient of volume compressibility (m). If t •ficient of consolidation (c,) determined in the test for the given stress increment u m?/year, calculate the coefficient of permeability in cm/s. If the sample tested at the site was taken from a clay layer 3.0 m in thickness, determin consolidation settlement resulting from the given stress increment. lution:
First time post
13. Situation 13 - The soil is acted upon by a uniformly distributed load ΔP = 60 kPa at the ground surface. a. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the preconsolidation pressure of clay is 230 kPa. Use Cs = Cc/5. Round off to the nearest whole number. b. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the clay is normally consolidated. Round off to the nearest whole number. c. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the preconsolidation pressure of clay is 200 kPa. Use Cs = Cc/5. Round off to the nearest whole number.