A 6 m depth of sand layer has a dry unit weight of 14.9 kN/m' and satura weight of 18.1 kN/m³ overlies a 5 m layer of normally consolidated clay below which is an impermeable stratum. The properties of clay layer are (Gs= 2.7, cc 0.28, e 0.88, c,= 4.3 m²/year). The water table was 1 m below natural ground surface. The ground surface is loaded with uniformly 100 kN/m². Determine: 1) The expected total primary consolidation settlement. 2) Time required for ultimate consolidation settlement. 3) Excess p.w.p and effective vertical stress at point located 1 m below the surface of clay layer after 6 months of applying loading:

A 6 m depth of sand layer has a dry unit weight of 14.9 kN/m' and satura weight of 18.1 kN/m³ overlies a 5 m layer of normally consolidated clay below which is an impermeable stratum. The properties of clay layer are (Gs= 2.7, cc 0.28, e 0.88, c,= 4.3 m²/year). The water table was 1 m below natural ground surface. The ground surface is loaded with uniformly 100 kN/m². Determine: 1) The expected total primary consolidation settlement. 2) Time required for ultimate consolidation settlement. 3) Excess p.w.p and effective vertical stress at point located 1 m below the surface of clay layer after 6 months of applying loading:

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

: A 6 m depth of sand layer has a dry unit weight of 14.9 kN/m³ and saturated unit
weight of 18.1 kN/m³ overlies a 5 m layer of normally consolidated clay below
which is an impermeable stratum. The properties of clay layer are (Gs= 2.7,
cc 0.28, e 0.88, c,= 4.3 m²/year). The water table was I m below natural ground
surface. The ground surface is loaded with uniformly 100 kN/m². Determine:
1) The expected total primary consolidation settlement.
2) Time required for ultimate consolidation settlement.
3) Excess p.w.p and effective vertical stress at point located 1 m below the surface
of clay layer after 6 months of applying loading.
4) Permeability of clay layer.

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