borehole at a site reveals a soil profile shown below. Calculate the effective stress (σ’) in lb/ft2 at the bottom of the soft clay layer. Assume that specific gravity (Gs) of all soil layers is 2.65.

borehole at a site reveals a soil profile shown below. Calculate the effective stress (σ’) in lb/ft2 at the bottom of the soft clay layer. Assume that specific gravity (Gs) of all soil layers is 2.65.

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter2: Geotechnical Properties Of Soil

Section: Chapter Questions

Problem 2.5P

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Concept explainers

Methods to Determine Vertical Stress

The load applied to the soil is transferred to the underground. The presence of water at soil pores and solid grains above the soil are the primary components that are responsible for the effective load transfer. Due to the load acting, the internal component of the soil or the underground formations undergoes deformations or a tectonic shift. The amount of deformation depends upon the amount of load acting on the soil surface, which indeed, depends on the weight of everything present above the soil. Due to this, the underground soil element develops internal stresses which try to resist the tectonic changes.

Question

A borehole at a site reveals a soil profile shown below. Calculate the effective stress (σ’) in lb/ft² at the bottom of the soft clay layer. Assume that specific gravity (G_s) of all soil layers is 2.65.

2 ft
Dry sand, unit weight 108.8 lb/ft
3 ft
Fine sand, water content = 30%
15 ft
Soft clay, water content =40%

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