Expansive soils have several properties that make them problematic:
Here is a downloadable PDF of Chen's book:
Determining the percentage of clay-sized particles (finer than 0.002 mm). Direct Swell Tests Using a consolidometer (oedometer), labs conduct: foundations on expansive soils chen pdf
Existing local structures showing classic diagonal cracking in walls or heaving slabs. Laboratory Index Testing
Design considerations
Perhaps the most technical chapter involves calculating total and differential heave. Chen outlines the method of summing the swell of discrete layers within the active zone.
was not merely an academic; he was a practitioner with decades of experience in the American Southwest and the High Plains—regions plagued by some of the most aggressive expansive soil conditions on earth (such as the Pierre Shale and bentonite clays). Expansive soils have several properties that make them
Searching for usually yields results from academic databases, engineering forums, or digital libraries like Sci-Hub, ResearchGate, or Academia.edu. There are legitimate reasons for this persistent demand:
Structural beams connect the piers and are cast over a void space (often using degradable cardboard forms) so the expanding surface soil cannot push up against the structure. Shallow Foundations Chen outlines the method of summing the swell
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