为探究复杂三维应力状态下固化淤泥土的力学行为规律与内在特性，采用常规三轴、等中主应力比三轴及平面应变三轴试验，系统分析围压、中主应力比与应力路径对固化淤泥土应力-应变关系、各向应变发展及强度指标的影响。结果表明： 等中主应力比条件下固化淤泥土弹性模量与屈服强度最大，平面应变条件下次之，常规三轴条件下最小；常规三轴下土体表现出显著应变软化，真三轴下应变软化程度随中主应力比增大而减弱，平面应变下屈服后无明显软化特征；土体黏聚力与内摩擦角随中主应力比增大而逐步提高。固化淤泥土力学性能具有明显应力路径依赖性与中主应力效应，隧道基坑开挖、地下结构回填等实际工程应依据地基真实应力状态选取对应的试验方法与力学指标。

To investigate the mechanical behavior and intrinsic characteristics of solidified silt soil under complex three-dimensional stress states, conventional triaxial tests, triaxial tests with constant intermediate principal stress ratio, and plane strain triaxial tests are carried out. The influences of confining pressure, intermediate principal stress ratio, and stress path on the stress-strain relationship, anisotropic strain development, and strength indices of solidified silt soil are systematically analyzed. The results show that the elastic modulus and yield strength of solidified silt soil are the largest under the condition of constant intermediate principal stress ratio, followed by those under plane strain condition, and the smallest under conventional triaxial condition. The soil exhibits obvious strain softening under conventional triaxial condition, while the degree of strain softening under true triaxial condition weakens with the increase of intermediate principal stress ratio, and no obvious softening is observed after yielding under plane strain condition. The cohesion and internal friction angle of the soil increase gradually with the rise of intermediate principal stress ratio. The mechanical properties of solidified silt soil present significant stress path dependence and intermediate principal stress effect. For practical engineering such as tunnel foundation pit excavation and underground structure backfilling, the corresponding test methods and mechanical indices should be selected according to the actual stress state of the foundation.