please answer both partsa) Point loads of 1000,5000, and 3000 lbs acts on point A, B, and C respectively. Determine theincreases in vertical stress at depth 10ft below D.IA.10ftB10ftD5ftb) You are a geotechnical engineer evaluating the stability of the slope shown in the figure below.You consider that a potential shearing surface could occur at the shear surface plotted in red. Thesoil has a friction angle of 30° and no cohesion. Determine the shear strength at point A along thissurface when the ground water table is at B. and then determine the new shear strength whenthe ground water table rises to a level C. The unit weight of the soil is 120lb/ft and 123lb/ftabove and below the water table respectively.potentialSheaningSurface12ft20H

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a) Point loads of 1000,5000, and 3000 lbs acts on point A, B, and C respectively. Determine the increases in vertical stress at depth 10ft below D.

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter16: Lateral Earth Pressure

Section: Chapter Questions

Problem 16.3P: The soil profile at a site is shown Figure P16.3. Find the total horizontal normal stresses at A and...

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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

please answer both parts
a) Point loads of 1000,5000, and 3000 lbs acts on point A, B, and C respectively. Determine the
increases in vertical stress at depth 10ft below D.
I
A.
10ft
B
10ft
D
5ft
b) You are a geotechnical engineer evaluating the stability of the slope shown in the figure below.
You consider that a potential shearing surface could occur at the shear surface plotted in red. The
soil has a friction angle of 30° and no cohesion. Determine the shear strength at point A along this
surface when the ground water table is at B. and then determine the new shear strength when
the ground water table rises to a level C. The unit weight of the soil is 120lb/ft and 123lb/ft
above and below the water table respectively.
potential
Sheaning
Surface
12ft
20H

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Step 2 Calculate the radial distance between (B to D) and (A to D)

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