1. A soil deposit is shown in the figure below. The ground water table, initially at the ground surface, waslowered to a depth 25ft below the ground. After such lowering, the degree of saturation of the sand abovewater table was lowered to 20%.Water tableGround surfaceYsat = 135 pcfYa = 116 pcfSand50 ft25 ftClayYsat = 120 pcfa) What is the vertical effective pressure at the midheight of the clay layer before lowering of the watertable, in psf.b) What is the vertical effective pressure at the midheight of the clay layer after lowering of the watertable, in psf.c) What is the vertical effective pressure when there is no water in the sand layer, in psf.

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1. A soil deposit is shown in the figure below. The ground water table, initially at the ground surface, was lowered to a depth 25ft below the ground. After such lowering, the degree of saturation of the sand above water table was lowered to 20%. Water table Ground surface Ysat = 135 pcf Ya = 116 pcf Sand 50 ft 25 ft Clay Ysat = a) What is the vertical effective pressure at the midheight of the clay layer before lowering of the water table, in psf. b) What is the vertical effective pressure at the midheight of the clay layer after lowering of the water table, in psf. c) What is the vertical effective pressure when there is no water in the sand layer, in psf.

1. A soil deposit is shown in the figure below. The ground water table, initially at the ground surface, was lowered to a depth 25ft below the ground. After such lowering, the degree of saturation of the sand above water table was lowered to 20%. Water table Ground surface Ysat = 135 pcf Ya = 116 pcf Sand 50 ft 25 ft Clay Ysat = a) What is the vertical effective pressure at the midheight of the clay layer before lowering of the water table, in psf. b) What is the vertical effective pressure at the midheight of the clay layer after lowering of the water table, in psf. c) What is the vertical effective pressure when there is no water in the sand layer, in psf.

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

Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.

Question

1. A soil deposit is shown in the figure below. The ground water table, initially at the ground surface, was
lowered to a depth 25ft below the ground. After such lowering, the degree of saturation of the sand above
water table was lowered to 20%.
Water table
Ground surface
Ysat = 135 pcf
Ya = 116 pcf
Sand
50 ft
25 ft
Clay
Ysat = 120 pcf
a) What is the vertical effective pressure at the midheight of the clay layer before lowering of the water
table, in psf.
b) What is the vertical effective pressure at the midheight of the clay layer after lowering of the water
table, in psf.
c) What is the vertical effective pressure when there is no water in the sand layer, in psf.

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