SETTLEMENTSPROBLEM 11:A 2m clay layer has values of e = 0.92,Gs = 2.72 and a compression index Cc= 0.333. Above the clay is a sandlayer of 3 m thick with e = 0.50 and Gs= 2.62. Water table is located 1.5 mbelow the ground surface (sand layer).If a 3 m thick back fill is placed over theexisting ground surface, determine theconsolidation settlement of the softclay layer. Unit weight of back fill is17.3 kN/m?.a. 118 mmC. 81 mmb. 56 mmd. 107 mm

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Answered: PROBLEM 11: A 2m clay layer has values…

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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6 m thick silty sand filling was laid on a 12 m thick compressible clay layer with controlled compression technique. Under this clay layer, there is a 4 m thick pebbly sand layer. Assuming that the settlement of the embankment and gravel-sand layer is insignificant compared to the settlement of the clay layer, calculate the consolidation settlement of the clay layer and when 50% of this settlement will occur. NOTE: You can make the settlement calculation as a single layer calculation.
1. A soil profile is shown in the figure. A uniformly distributed load of 75kPa is applied at the ground surface. The clay is normally consolidated. Compute the secondary settlement 8 years after the completion of primary consolidation. Time for completion of primary settlement is 2 years. Assume secondary compression index = 0.025
1. A soil profile is shown in the figure. A uniformly distributed load of 75kPa is applied at the ground surface. The clay is normally consolidated. Compute the compression index Compute the primary consilidation settlement
2.2 A consolidated-drained triaxial test was conducted on a normally consolidated clay. The results are: 03=140 kN/m? (Aga) f=104KN/m2 Please determine oi and 3.
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).
A layer of soft clay having an initial void ratio of 1.5 is 15 m thick. Under a compressive load applied above it, the void ratio decreased by one half. Evaluate the reduction in the thickness of the clay layer in m.
Problem 7.19 only.
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.
The thickness of a saturated specimen of clay under a consolidation pressure of 100 kN/m2 of is 24 mm and its water content is 20%. On increase of the consolidation pressure to 200 kN/m2, the specimen thickness decreases by 3 mm. Determine the compression index for the soil if the specific gravity of the soil grains is 2.70. a.0.92 b.0.56 c.0.63 d.0.52

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