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以宁波轨道交通1号线②、③和④层海相沉积软土为对象,进行GDS单向振动三轴试验,研究了不同动应力幅值和频率作用下软土的动强度与孔压特性。结果表明:相同动应力状态下,等向固结时的强度要比K0固结时的强度大;在相同动应力幅值条件下,频率越高,强度越高;动应力越大,试样强度越大,发生硬化现象。随着振动次数的增加,孔隙水压力也不断增大,仅③层粉质黏土夹砂层在应力幅值为5 kPa时孔压有稳定趋势。最后,通过对动三轴试验数据进行拟合,得到了模型参数,其结果可以用来预测循环荷载作用下土体的累计孔压。
Three-axis GDS uniaxial vibration tests were carried out on the ②, ③ and ④ layers of marine soft soil under the condition of different dynamic stress amplitude and frequency. The dynamic strength and pore pressure properties of soft clay under different dynamic stress amplitudes and frequencies . The results show that under the same dynamic stress, the strength at the time of consolidation is higher than that at the time of K0 consolidation. Under the same dynamic stress amplitude, the higher the frequency, the higher the strength. The higher the dynamic stress, The greater the intensity, the phenomenon of hardening occurs. With the increase of vibration frequency, the pore water pressure also increases continuously, and only pore pressure of silty clay sand layer with 5 kPa stress has a steady trend. Finally, by fitting the moving triaxial test data, the model parameters are obtained, and the results can be used to predict the cumulative pore pressure of soil under cyclic loading.