Observation of an Expansive Clay Under Controlled Conditions

摘要

Observation of the behavior of a highly expansive clay, heavily fissured by dessication, have been made over extended periods. Measurements were made of soil heave under sustained ponding as a function of time and depth and thus the effects of progressive absorption of water into the clay were directly observed. Moisture content and density were monitored by nuclear probes. With adequate calibration, the nuclear equipment was found to be quite successful in monitoring changes in moisture content and density. The simple and inexpensive heave measurements points, pushed or driven into position, are recommended for regular use in observing movements in highway embankments and foundation soils.