Study on dynamic constitutive relation and microstructure of melted dark green silty soil in Shanghai

Through lab tests on melted and common dark green silty soil of the passway in Shanghai Fuxing East Road Tunnel by using the typical triaxial test machine-CKC,their dynamic stress and stress-strain relations with different frequencies were studied.In addition,the maximum values of dynamic elastic modulus,dynamic stress and dynamic shear modulus of the silty soil were educed.Moreover,through the contrast analysis of the microstructure pictures,the maximum dynamic stress of this kind of soil would decline after being frozen and melted.