... the concept that although the trench was being dug inclay which was not yielding water itself, pore pressures in sand beneath the formation could be the cause of the heave. This is a very detailed case study, including piezometric and ground movement records together with notes on the observed soil fabric...

...R A NICHOLLS; S N WERSCHING; L T HOCK; J A FRAME AIRPORTS INTERNATIONAL SITE INVESTIGATION PRELIMINARY EARTHWORKS DESIGN GROUND TREATMENT SITES PIEZOCONES INSTRUMENTS INSTRUMENTATION SOFT ROTARY DRILLING STATIONARY PISTONS SAMPLING SOILS FABRICS STUDIES HOLES EXPLORATORY...