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针对竖向循环荷载作用下软土地基桶形基础的承载特性进行模型试验。首先,采用真空预压的方法制备模型土池,通过土的物理性试验和不固结不排水三轴压缩试验测得土池中土的基本物理力学性质;然后,在确定桶形基础竖向静承载力的基础上进行循环荷载试验,在不同动静荷载组合作用下观测地基的破坏特性,记录循环累积变形与循环振次的关系。结果表明,模型槽内不同位置不同深度土的基本物理力学性质指标相差不大,真空预压制备土池的方法可行;桶形基础在循环荷载作用下的产生的累积变形与蠕变过程相似;软土地基桶形基础的循环承载特性与动、静荷载水平有较大的关系,在其应用过程中要综合考虑动、静荷载作用。
The model test of bearing capacity of bucket foundation on soft soil foundation under vertical cyclic loading is carried out. First, the model soil pool was prepared by vacuum preloading method. The physical and mechanical properties of soil in the soil pool were measured by the physical test of soil and unconsolidated undrained triaxial compression test. Then, Cyclic loading test was carried out on the basis of force, and the failure characteristics of the foundation were observed under the combination of different dynamic and static loads. The relationship between cumulative cyclic deformation and cyclic vibration was recorded. The results show that the indexes of basic physical and mechanical properties at different depths of soil in different positions in the model tank are similar, and the method of preparing prefabricated soil by vacuum preloading is feasible. The cumulative deformation of bucket foundation under cyclic loading is similar to the creep process. The cyclic loading characteristics of the soil-based bucket foundation have a great relationship with the dynamic and static load levels, and the dynamic and static load effects should be considered in the application process.