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为研究频率对结构性软黏土动力特性的影响,以天津滨海新区结构性海积软土为试验材料,基于两种波形,进行了一系列动三轴试验,研究不同振动频率作用下结构性软黏土应力–应变关系、动力塑性累积应变以及孔压特性。试验结果表明,总体上振动频率越低,土体的软化程度越高,土体产生的变形越大,累积应变增速快最终值大,相同条件方波作用下的动应力应变软化程度高于正弦波。频率对孔压有影响,在相同振次下,孔压随频率的增大而减小。振幅对于孔压变化的影响表现为低幅值上升速度快,数值也大于高幅值作用下的孔压值,有明显的高幅滞后现象。
In order to study the effect of frequency on the dynamic characteristics of structural soft clay, a series of dynamic triaxial tests based on two waveforms were conducted using the structural marine soft soil of Tianjin Binhai New Area as a test material to study the structural softness under the influence of different vibration frequencies. Clay stress-strain relationship, dynamic plastic accumulation strain, and pore pressure characteristics. The test results show that the lower the overall vibration frequency, the higher the degree of softening of the soil, the greater the deformation produced by the soil, the faster the cumulative strain growth value is greater, and the dynamic stress-strain softening degree under the same conditions of square wave is higher than Sine wave. The frequency has influence on the pore pressure. Under the same vibration, the pore pressure decreases with the increase of the frequency. The influence of the amplitude on the pore pressure change is that the low amplitude value rises quickly, and the value is also larger than the pore pressure value under the high amplitude effect. There is a significant high amplitude hysteresis phenomenon.