Experimental Study on Parameters of Hardening Soil Model with Small Strain Stiffness for Muddy Silty Clay and Silty Sandy Soil in Yangtze Floodplain Area

To obtain test parameters for the hardening soil model with small strain stiffness (HSS) of the muddy silty clay and silty sandy soil in the Nanjing Yangtze River floodplain, the following tests were conducted: consolidation test, consolidated-drained triaxial test, triaxial loading and unloading test, resonant column test and other common geotechnical tests. These test parameters included reference tangent modulus Eoedref, reference secant modulus E50ref, reference unloading and reloading modulus Eurref, failure ratio Rf, etc. A standardized process for determining HSS model parameters of certain types of soils, including relevant laboratory tests procedures, calculations, and analyses, has also been discussed. The test findings conclude with a summary of the model parameters for the typical strata in the Yangtze River floodplain region, providing engineering reference value for the deep foundation excavation and other relevant projects in the Yangtze River floodplain area.