Foundation treatment and shield construction disturbance are the causes of squeezing soil which damages the initial structure and state

leads to the disturbance of soil

and changes the property of secondary consolidation. According to the squeezing disturbance of different levels caused by different preloads

a series of step-loading consolidation tests are conducted. The results indicate that

with the increase of preloads

the structure yield stress increases

compression index is almost the same when preload is less than structure yield stress

and decreases suddenly when preload is larger than structure yield stress; then it comes to a steady value. The secondary consolidation coefficient increases firstly

then decreases

finally gets to steady with the increase of pressure; and the secondary consolidation coefficient would decrease when disturbance increases; and a computational model for secondary consolidation coefficient is put forward; and the model coincides well according to the several testing data

and does well in predicting

which is useful for the prediction of post-load settlement.