For one embankment built by toe-shooting method at deep mud foundation,drilling and geophysical method were used for detecting the replacement effect,then settlement of the embankment were observed and ultimate settlement was predicted by Verhulst model based on the observed data,finally,the settlement calculation method of embankment was established,and was used the settlement of the embankment.The results show that,there is a certain kind of stone-mud mixed layer and pure mud layer at the bottom of this kind of embankment,and the two layers results in a longer time to consolidate and larger settlement;the settlement of the embankment undergone 5 months to be stable,with ultimate settlement between 1366-1556mm;the settlement of embankment is induced by the compression of stone-mud mixed layer,mud layer and silt clay layer,and the total settlement by calculation and prediction are close.