循环荷载作用下软粘土重塑样的累积变形特性
Cumulative Deformation Characteristics of Soft Clay Remolded Samples under Cyclic Loading

针对循环荷载下软粘土地基的长期累积变形问题，通过室内动三轴试验对不同固结压力下土体的累积变形特性进行了研究，并根据动三轴试验结果，对已有累积应变计算模型进行了改进。结果表明：在固结压力相同的情况下，动应力比越大，土体的累积应变发展越迅速；在动应力比相近的情况下，不同固结压力累积应变曲线较为接近；改进后的计算模型可以明确地反映土体类型和物理状态、土的应力状态、循环振次对累积应变的影响，合理地计算循环荷载作用下的累积变形。
Aimed to predict the cumulative deformation of soft clay foundation under cyclic traffic load, the cumulative deformation characteristics of soil under different consolidation pressures were studied by dynamic triaxial tests. Existing cumulative strain calculation model was improved according to the test results. The results show that under the same consolidation pressure, the greater the dynamic stress ratio is, the more rapid the accumulation strain development is. When the dynamic stress ratio is similar, the cumulative strain curves of different consolidation pressures are close. The improved model can clearly reflect the influence of soil type and physical state, soil stress state and cyclic vibration times on cumulative strain, and reasonably calculate the cumulative deformation under cyclic load.