Approach For Assessing Time Of Preload And Surcharge Removal Of Embankments On Soft Soils

The process of preload release involves a review of the instrumentation and monitoring data. Back analysis is carried out to match field measurements with numerical predictions by adjusting relevant geotechnical model, parameters and construction sequence. Once a match is achieved, the calibrated geotechnical model is used for the prediction of long- term settlement. The removal of preload and surcharge fill is only allowed via the release of a Hold Point, when the predicted long term settlement satisfies the design criteria. This paper provides technical advice and guidance to undertake geotechnical review of preload performance as part of the Hold Point release process.