High value such as 20% shown by some tests for sensitive clay is related to the high value of ratio of secondarycompression index to compression index caused by soil structure collapse.
Based on the model, the secondarycompression settlement formula is established, which reflects the influence of soft clay characteristics, pre-consolidation pressure and reloading pressure.
A new type of exponential curve model, coupled with rheological term for soft soils, is put forward based on the calculation formula of modified secondarycompression under absolute time coordinates.