Abstract: In order to avoid the geologic disaster emerging from freezing construction and better apply the freezing method to undergroud construction in Shanghai, the thesis takes on the relational studies for the first time. Through the consolidated-undrained triaxial shear tests on melted and common dark green silty clay of the 6th storey in the passway in Shanghai Fuxing East Road Tunnel by using the instrument SJ-1A, the thesis studies the relationship among axial stress, axial train and pore water pressure. A new constitutive model of the melted dark green silty clay is established based on the disturbed state concept (DSC) theory, which is verified by the test results. The research has shown that the proposed DSC constitutive model can describe the mechanical of the stratum preferably.