An undisturbed soil sample was taken from themiddle of a clay layer (i.e., 1.5 m below GL), asshown in figure. The water table was at the topof clay layer. Laboratory test results are as follows:Natural water content of clay: 25%Precdonsilidation pressure of clay : 60 kPaCompression index of clay: 0.50Recompression index of clay: 0.05Specific gravity of clay: 2.70Bulk unit weight of sand: 17 kN/m3A compacted fill of 2.5 m height with unit weightof 20 kN/m3 is placed at the ground level.1 mSandGWT1 mClayHard stratumAssuming unit weight of water as 10 kN/m³, theultimate consolidation settlemnet (expressed inmm) of the clay layer is

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Engineering

Civil Engineering

Assuming unit weight of water as 10 kN/m³, the ultimate consolidation settlemnet (expressed in mm) of the clay layer is

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

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

Question

An undisturbed soil sample was taken from the
middle of a clay layer (i.e., 1.5 m below GL), as
shown in figure. The water table was at the top
of clay layer. Laboratory test results are as follows:
Natural water content of clay
: 25%
Precdonsilidation pressure of clay : 60 kPa
Compression index of clay
: 0.50
Recompression index of clay
: 0.05
Specific gravity of clay
: 2.70
Bulk unit weight of sand
: 17 kN/m3
A compacted fill of 2.5 m height with unit weight
of 20 kN/m3 is placed at the ground level.
1 m
Sand
GWT
1 m
Clay
Hard stratum
Assuming unit weight of water as 10 kN/m³, the
ultimate consolidation settlemnet (expressed in
mm) of the clay layer is

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Refer to Figure below. Estimate the primary consolidation settlement in the clay layer. Given: Δσ = 150 kN/m2; H1 = 3 m; H2 = 4 m; and H3= 5 m. Soil characteristics are as follows: • Sand: γdry = 15 kN/m3, γsat = 19 kN/m3 • Clay: LL = 65; e = 0.65; γsat = 18 kN/m3; ; Cs =1/6cc σʹc = 200 kN/m2
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In a drained triaxial test on consolidated clay the stress and angle are as follows: Deviator stress is 20 lb/in2 and friction angle is 21°. Calculate the effective confining pressure at failure.? a) 21 lb/in2 b) 22.2 lb/in2 c) 25.4 lb/in 2 d) 17.9 lb/in2
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During the construction of a housing project, it is estimated that the average permanent load on a clay layer located at 6 m below ground surface will increase by about 200 kPa. The average effective overburden pressure at the middle of the 4.5 m thick clay is 100 kPa. The result from soil sample testing givens the consolidation parameters eo = 0.96, Cc = 0.45, Cv = 2.5 m2/year, and the clay is in www normally consolidated condition. Estimate the total consolidation settlement that will happen and the time taken to achieve 90% consolidation stage.
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