Principles Of Geotechnical Engineering, Si Edition
9th Edition
ISBN: 9781305970953
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 4, Problem 4.6P
Refer to the soil in Problem 4.5. Using the Casagrande plasticity chart, graphically estimate the shrinkage limit of the soil as shown in Figure 4.22.
4.5 The following data were obtained by conducting liquid limit and plastic limit tests on a soil collected from the site.
Liquid limit tests:
Plastic limit test: PL = 19.3%
a. Draw the flow curve and determine the liquid limit.
b. Using the Casagrande plasticity chart (Figure 4.21), determine the soil type.
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A flexible circular area is subjected to a uniformly distributed load of 148 (see the figure below). The diameter of the load area is 2 . Estimate the average stress increase () below the center of the loaded area between depths of 3 and 6 . Use the equations:
and
(Enter your answer to three significant figures.)
=
A square flexible foundation of width B applies a uniform pressure go to the underlying ground.
(a) Determine the vertical stress increase at a depth of 0.625B below the center using Aσ beneath the corner of a uniform rectangular load given by Aσ =
Variation of Influence Value I
qoI. Use the table below.
n
0.8
1.0
m 0.2 0.4 0.5
0.6
0.2 0.01790 0.03280 0.03866 0.04348 0.05042 0.05471
0.4 0.03280 0.06024 0.07111 0.08009 0.09314 0.10129
0.5 0.03866 0.07111 0.08403 0.09473 0.11035 0.12018
0.6 0.04348 0.08009 0.09473 0.10688 0.12474 0.13605
0.8 0.05042 0.09314 0.11035 0.12474 0.14607 0.15978
1.0 0.05471 0.10129 0.12018 0.13605 0.15978 0.17522
(Enter your answer to three significant figures.)
Ασ/90
=
(b) Determine the vertical stress increase at a depth of 0.625B below the center using the 2 : 1 method equation below.
90 x B x L
Aσ =
(B+ z) (L + z)
(Enter your answer to three significant figures.)
Ασ/90 =
(c) Determine the vertical stress increase at a depth of 0.625B below the center using…
Point loads of magnitude 100, 200, and 360 act at , , and , respectively (in the figure below). Determine the increase in vertical stress at a depth of 6 below point . Use Boussinesq's equation.
(Enter your answer to three significant figures.)
=
Chapter 4 Solutions
Principles Of Geotechnical Engineering, Si Edition
Ch. 4 - During Atterberg limit tests in the soil mechanics...Ch. 4 - Prob. 4.2PCh. 4 - Prob. 4.3PCh. 4 - Results from a liquid limit test conducted on a...Ch. 4 - The following data were obtained by conducting...Ch. 4 - Refer to the soil in Problem 4.5. Using the...Ch. 4 - Following results are obtained for a liquid limit...Ch. 4 - Prob. 4.8PCh. 4 - Prob. 4.9PCh. 4 - Prob. 4.10P
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