At Rest Pressure
At rest lateral earth pressure, represented as K0, is the in situ lateral pressure. It can be measured directly by a dilatometer test (DMT) or a borehole pressuremeter test (PMT). As these are rather expensive tests, empirical relations have been created in order to predict at rest pressure with less involved soil testing, and relate to the angle of shearing resistance. Two of the more commonly used are presented below.
Jaky (1948) for normally consolidated soils:
Mayne & Kulhawy (1982) for overconsolidated soils:
The latter requires the OCR profile with depth to be determined.
To estimate K0 due to compaction pressures, refer Ingold (1979)
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