The physico-mechanical properties of soil vary in different regions. There are great differences on engineering properties for soils formed by different geological depositions. Based on the investigation data of Dalian offshore artificial island

the soils could be subdivided into three independent statistical unit according to the geological origin

i.e.

the top marine deposit

middle marine-continental deposit

and deep continental deposit. The physico-mechanical indices of deposits are analyzed by the SPSS software incorporated with mathematical statistics methods. The Gaussian distribution behaviors of deposit soils are hypothesis testing by the skewness and kurtosis method. The shear strength indices are optimized by the Bayesian approach. The results show that there are significant differences in the engineering properties of the deposits and their distribution. The standard deviation and variable coefficient of shear strength indices decrease after Bayesian optimized

and the time-varying predictions of parameters are realized.