[To constructure a composite foundation with sand column with the property of sand as follows: the natural dry density of Pa = 1.41g/cm³ the specific gravity of soil particle Gs = 2.43 the maximum dry density Pmax = 1.82g/cm³ the minimum dry density Pmin = 1.33g/cm³. The hammering method (no vibration) is used to form the sand column with a diameter of d=650mm and equilateral triangle distribution. The requirement of the relative density 85%>Dr≥70% (a) What is the range of the required porosity after treatment?

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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To constructure a composite foundation with sand column with the property of sand
as follows:
the natural dry density of Pa = 1.41g/cm³
the specific gravity of soil particle Gs = 2.43
the maximum dry density Pmax = 1.82g/cm³
the minimum dry density Pmin = 1.33g/cm³.
The hammering method (no vibration) is used to form the sand column with a
diameter of d=650mm and equilateral triangle distribution. The requirement of the
relative density 85%>Dr≥70%
(a) What is the range of the required porosity after treatment?
(b) If the porosity after treatment el = 0.6, please calculate the distance of columns.
Tips: s=0.955d
1+%
eo - G
Transcribed Image Text:To constructure a composite foundation with sand column with the property of sand as follows: the natural dry density of Pa = 1.41g/cm³ the specific gravity of soil particle Gs = 2.43 the maximum dry density Pmax = 1.82g/cm³ the minimum dry density Pmin = 1.33g/cm³. The hammering method (no vibration) is used to form the sand column with a diameter of d=650mm and equilateral triangle distribution. The requirement of the relative density 85%>Dr≥70% (a) What is the range of the required porosity after treatment? (b) If the porosity after treatment el = 0.6, please calculate the distance of columns. Tips: s=0.955d 1+% eo - G
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