A soil profile is shown in figure (1) along with the standard penetration numbers at each 1.5m. The numbers of blows required of three 150-mm intervals are recorded. Use united state safety hammer with E, =90 percent, the borehole diameter is 110 mm, the drill rod length is 8 m and the sample is without liner. The water table at 1.5 m. Calculate the measured SPT N values, N70, in depths (1.5 and 3 m). W Comments (%) Soil description Depth (m) Soil sample type and number 0 1 1.5 4,4,6 SS-I 8.2 2 Y 16.5 kN/m² "G.WT. Y y= 19 kN/m 3 5.5.6 SS-2 17.6 LL-38 PI-11 4 Ya 19 kN/m 2.4,5 ST-1 20.4 LL 36 4- 112 kN/m² 6,7,1 55-3 20.6 Y=19.5 kN/m 7,8,9 SS-4 9
A soil profile is shown in figure (1) along with the standard penetration numbers at each 1.5m. The numbers of blows required of three 150-mm intervals are recorded. Use united state safety hammer with E, =90 percent, the borehole diameter is 110 mm, the drill rod length is 8 m and the sample is without liner. The water table at 1.5 m. Calculate the measured SPT N values, N70, in depths (1.5 and 3 m). W Comments (%) Soil description Depth (m) Soil sample type and number 0 1 1.5 4,4,6 SS-I 8.2 2 Y 16.5 kN/m² "G.WT. Y y= 19 kN/m 3 5.5.6 SS-2 17.6 LL-38 PI-11 4 Ya 19 kN/m 2.4,5 ST-1 20.4 LL 36 4- 112 kN/m² 6,7,1 55-3 20.6 Y=19.5 kN/m 7,8,9 SS-4 9
Principles of Foundation Engineering (MindTap Course List)
8th Edition
ISBN:9781305081550
Author:Braja M. Das
Publisher:Braja M. Das
Chapter10: Drilled-shaft Foundations
Section: Chapter Questions
Problem 10.9P
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Question
Please solve the example, explaining the solution steps and writing by hand
Transcribed Image Text:A soil profile is shown in figure (1) along with
the standard penetration numbers at each 1.5m. The
numbers of blows required of three 150-mm intervals are
recorded. Use united state safety hammer with E, =90
percent, the borehole diameter is 110 mm, the drill rod
length is 8 m and the sample is without liner. The water
table at 1.5 m. Calculate the measured SPT N values,
N70, in depths (1.5 and 3 m).
W
Comments
(%)
Soil
description
Depth
(m)
Soil
sample
type and
number
0
1
1.5
4,4,6
SS-I
8.2
2
Y 16.5 kN/m²
"G.WT. Y
y= 19 kN/m
3
5.5.6
SS-2
17.6 LL-38
PI-11
4
Ya 19 kN/m
2.4,5
ST-1
20.4
LL 36
4- 112 kN/m²
6,7,1
55-3
20.6
Y=19.5 kN/m
7,8,9
SS-4
9
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