Answered: . What is the effective vertical stress…

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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Question

In the deposit shown in the accompanying figure the groundwater level was originally at the ground surface. The water table was lowered by drainage to a depth of 25 ft., whereupon the degree of saturation of the sand above the lowered water table decreased to 20 percent.

1. What is the effective vertical stress at the mid height of the clay layer before lowering the water table?

a. 4350 psf

b. 4560 psf

c. 3500 psf

d. 6400 psf

2. What is the effective vertical stress at the mid height of the clay layer after lowering the water table?

a. 4343 psf

b. 4557 psf

c. 5530 psf

d. 6452 psf

3. What is the effective vertical stress at the mid height of the clay layer after lowering the water table to a depth of 50 ft?

a. 5580 psf

b. 6710 psf

c. 3680 psf

d. 5860 psf

Ground water table
Yary = 116 Ib/ft3
Ysat = 135 Ib/ft3
Sand
50 ft
Clay
25ft
Ysat = 120 Ib/ft3

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