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分析了振动频率对饱和软土动孔压变化和累积塑性变形的研究现状,利用美国GCTS开发制造的SPAX-2000动静真三轴测试系统,研究了交通荷载下低频对饱和淤泥质软黏土的孔压以及塑性变形的影响规律。试验结果表明,频率越低,总动孔压值和累积塑性应变越大。当频率低于0.1 Hz时,加载频率对动孔压和塑性应变的增长速率影响较大,若频率大于0.5Hz时,频率的影响可以忽略不计。在高循环应力作用下,高次数的循环荷载能对动孔压和累积塑性应变产生较大影响;若在低循环应力水平下,循环次数的影响可以忽略。
The research status of dynamic pore pressure variation and cumulative plastic deformation of saturated soft soil was analyzed. The SPAX-2000 dynamic and static triaxial testing system developed and developed by GCTS was used to study the low frequency of saturated soft clay clay under traffic load. The effect of pressure and plastic deformation. Test results show that the lower the frequency, the greater the total dynamic pore pressure and cumulative plastic strain. When the frequency is lower than 0.1 Hz, the loading frequency has a great influence on the growth rate of the dynamic pore pressure and the plastic strain. If the frequency is greater than 0.5 Hz, the influence of the frequency is negligible. Under high cyclic stress, the high number of cyclic loads can greatly affect the dynamic pore pressure and cumulative plastic strain; if the level of low cyclic stress is low, the effect of the number of cycles can be ignored.