Marine silt is a common foundation material in port and waterway engineering projects,but its high moisture content often leads to unsatisfactory effectiveness when traditional solidifying materials are used.Indoor solidification experiments are conducted on high moisture content marine silt from the Zhoushan area to investigate the mechanical properties and micro-mechanisms of cement and solidifying agents in reinforcing the silt.The effects of the admixture amount of cement and solidifying agents and the curing age on the solidification effectiveness are systematically compared,and the microscopic structure is observed by scanning electron microscopy to analyze the solidification mechanism.The results indicate that the solidified soil exhibits strain-softening behavior.With an increase in curing age and admixture amount of solidifying agents,the unconfined compressive strength,cohesion,and compression modulus significantly improves,reaching 1.70-2.12 times,1.50-2.20 times,and 1.79-2.23 times those of cement-stabilized soil,respectively.The overall solidification performance of the solidifying agent is superior to that of cement,primarily because it produces more hydrated cementitious materials,resulting in stronger soil bonding.Additionally,it generates a higher content of expansive product(ettringite),which effectively fills the void in the high moisture content silt,thereby enhancing the compactness of the solidified soil structure.