Exercise:=A 15m-thick soft clay layer has following characteristics: Ysat16 kN/m³, C₁ = Cy = 0,001 cm²/s, Co = 0.3, e = 1.46.Ground water level is at the ground surface. Soft ground ispreloaded by a uniform load of 100 kPa combined with sanddrains. Sand drains have following characteristics: diameter =30 cm, spacing 2.5m, square pattern, length 15m. Thereare sand layers at the top & bottom of soft clay layer.Determine the time of preloading to reach the degree ofconsolidation U₁ = 90%.==

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Answered: A 15m-thick soft clay layer

Engineering

Civil Engineering

A 15m-thick soft clay layer

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter16: Soil Improvement And Ground Modification

Section: Chapter Questions

Problem 16.8P

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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

Exercise:
=
A 15m-thick soft clay layer has following characteristics: Ysat
16 kN/m³, C₁ = Cy = 0,001 cm²/s, Co = 0.3, e = 1.46.
Ground water level is at the ground surface. Soft ground is
preloaded by a uniform load of 100 kPa combined with sand
drains. Sand drains have following characteristics: diameter =
30 cm, spacing 2.5m, square pattern, length 15m. There
are sand layers at the top & bottom of soft clay layer.
Determine the time of preloading to reach the degree of
consolidation U₁ = 90%.
=
=

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