A half-closed clay layer is 8m thick and it can be assumed that the coefficients of consolidation in both the verticaland horizontal directions are the same. Vertical sand drains 300 mmin diameter, spaced at 3mcentres in a squarepattern, are to be used to increase the rate of consolidation of the clay under the increased vertical stress due to theconstruction of an embankment. Without sand drains the degree of consolidation at the time the embankment isdue to come into use has been calculated as 25%. What degree of consolidation would be reached with the sanddrains at the same time?

Q: When the soil layer is subjected to upward seepage, what is the effective stress of the soil layer…

A: Seepage is the flow of water within the soil due to the effect of gravity. The seepage flow…

Q: A half-closed clay layer is 8 m thick and it can be assumed that cv ¼ ch. Vertical sand drains 300…

A: The given data is: Clay layer thickness=8 m Sand drains diameter=300 mm sand drains spacing=3 m

Q: A recently constructed long Embankment is shown in the figure. It was made from compacted (Rolled)…

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Q: A cohesive fill has unit weight of 20 kN/m3 and has cohesion = 5 kN/m², P3D0°. The soil can stand…

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Q: .A layer of saturated clay is 10 m thick, the lower boundary being impermeable; an embankment is to…

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Q: When calculating secondary compression (Ss) the value H is either the initial height of the clay…

A: While calculating secondary compression (Ss) the value H is

Q: A 3-m-thick layer (two-way drainage) of saturated clay under a surcharge loading underwent 90%…

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Q: Knowing that the compression index, Cc = 0.333, and the preconsolidation pressure s’c = 140 kPa with…

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Q: . The undrained cohesion of a remoulded clay soil is 10 kN/m². If the sensitivity of the clay is 20,…

A: Undrained cohesion C=10 kN/m2,Sensitivity of clay S=20,The value of the remoulded compressive…

Q: 1.5m thick clay layer commences at a depth of approximately 2.5m below the ground surface and it is…

A: Given: Thickness of clay layer =1.5mCoefficient of consolidation = 4mm2/minNote that the depth of…

Q: Assuming the bedrock is impermeable, determine the time it took the clay layer to reach 90%…

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Q: A strata of 3.5 m thick fine sand has a void ratio of 0.7 and Gof 2.7. For a quick sand condition to…

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Q: Question-3: A soil profile is shown in Figure 3.1. If a uniformly distri kPa, is applied at the…

A: Given, Compression index Cc=0.27  Recompression index Cr=0.045 Uniformly distributed load∆σ=100…

Q: a. How long will it take for 50% settlement to occur? Cv = 0.002 cm2 /sec. b. How long will it…

A: Given: consolidated clay layer = 3m = 300cm settlement  =  80 mm Cv = 0.002 cm2

Q: A strata of normally consolidated clay of thickness 10 ft is drained on one side only. It has…

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Q: clay layer, whose total settlement under a given loading is expectedto be 13cm settles 3 cmat end of…

A: Given- ∆H=13 cm∆h=3cm after 1 month

Q: 1. A fill is placed at the ground surface over the entire site and the weight of the fill is…

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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.