why are collapsible soils rarely found in areas with very wet climates?
why are collapsible soils rarely found in areas with very wet climates?
Soil investigation at a site indicated over consolidated collapsible soil extending to a great depth. It is required to construct a footing at the site founded at a depth of 1.0 m below ground level. The site is subjected to flooding. The average unit weight of the soil is 19.5 kN/m3. Two oedometer tests were conducted on two undisturbed samples taken at a depth of 5 m from the ground level (mid depth). One test was conducted in its natural moisture content and the other on a soaked condition. The following test results are available.
Applied Pressure (kPa)
10
20
40
100
200
400
800
2000
Void ratio under natural moisture condition
0.795
0.790
0.787
0.780
0.770
0.740
0.710
0.640
Void ratio under soaked condition
0.775
0.770
0.757
0.730
0.680
0.630
0.540
0.370
The swell index determined from the rebound curve of the soaked sample is equal to 0.08. Answer the following:
a) Plot the e-logp curves for both tests.
b) Determine the average overburden pressure at the middle of the soil stratum
c) Total collapse settlement for an increase in pressure Δ?=710 kN/m2
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