ASTM International

Swelling Pressure Behavior Under Controlled Suction

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Courtesy of ASTM International

An experimental study has been conducted to study the swelling pressure behavior of expansive soil in both vertical and lateral directions simultaneously under controlled suction. A series of one-dimensional consolidation tests was carried out on compacted soil specimen using a newly developed oedometer with devices for controlling suction and measuring lateral pressure. The test results show that while both vertical swelling pressure and lateral pressure are path dependent, there are lower and upper values of mean effective pressure depending on initial soil conditions. Based on this approach, the safe swelling pressure can be determined. The results of this method were compared with other results and found to be in agreement with the proposed one.

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