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

Fundamentals of Geotechnical Engineering (MindTap Course List)
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Author:Braja M. Das, Nagaratnam Sivakugan
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Chapter9: Consolidation
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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
%3D
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.
Transcribed Image Text: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 %3D 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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