Experimental results were also simulated and interpreted using a computation program, PEI (i.e. Such a phenomenon can be attributed to pile shaft friction reduction in the active zone associated with suction reduction due to water infiltration and volume expansion of the soil. Experimental results suggest pile settlement increases due to water infiltration. In this paper, a single model pile mechanical behavior variations associated with suction changes in an unsaturated expansive soil under a service load were investigated. The mechanical behavior of in-situ pile foundations are significantly influenced by suction changes associated with water infiltration. effective stress) even in expansive soil deposits despite the fact the soil around the pile is in a state of unsaturated condition. Pile foundations are widely designed extending principles of saturated soil mechanics assuming drained conditions (i.e.
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