Environmental Engineering Reference
In-Depth Information
FIGURE 10.23
Fine-grained valley fill near Tucson, Arizona. The steep-sided gullies form in easily eroded collapsible soils.
FIGURE 10.24
Subsidence after 3 months caused by ground saturation around test plot in San Joaquin Valley, California.
(From Curtin, G.,
Geology, Seismicity and Environmental Impact, Special Publication
Association Engineering,
Geology, University Publishers, Los Angles, 1973. With permission.)
than 50% passing the 220 sieve. Dry density ranges from 57 to 110 pcf with a porosity
range of 43 to 85%. The predominant clay mineral is montmorillonite, and the clay content
of collapsing soils was reported to be from 3 to 30%. The observation was made that soils
