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对温度为-1℃的冻结兰州黄土在围压为0.6 MPa和不同动荷载振动频率条件下进行动三轴试验,试验采用分级加载,每一级荷载振动十次,加载波形为正弦波。实验结果表明:冻结兰州黄土的累积应变在整个加载过程中逐渐增大;当动荷载加载级数增加时,累积应变率逐渐变大。动应变幅随加载频率和振次的增加而减小;当频率小于或等于1 Hz时,动应变幅随加载级数的增加而增大;当频率大于1 Hz时,动应变幅随加载级数变化不大。随着加载级数的增加,滞回曲线的面积和密集程度越来越小,整体斜率和不闭合程度越来越大。用动模量来描述滞回曲线的整体倾斜程度。当频率小于或等于7 Hz时,动模量随加载级数的增加而增大;当频率大于7 Hz时,动模量随加载级数没有明显的规律。
The frozen Lanzhou loess with a temperature of -1 ℃ was subjected to dynamic triaxial tests under confining pressures of 0.6 MPa and different dynamic load vibration frequencies. The test was carried out by graded loading, with each load vibrating ten times and the loading waveform being a sine wave. The experimental results show that the cumulative strain of frozen Lanzhou loess increases gradually during the whole loading process, and the cumulative strain rate gradually increases as the dynamic load loading series increases. The dynamic strain amplitude decreases with the increase of the loading frequency and vibration frequency. When the frequency is less than or equal to 1 Hz, the dynamic strain amplitude increases with the increase of the loading order. When the frequency is greater than 1 Hz, Little change. With the increase of loading series, the area and density of hysteresis curves become smaller and smaller, and the overall slope and non-closure are more and more large. Use dynamic modulus to describe the overall inclination of the hysteresis curve. When the frequency is less than or equal to 7 Hz, the dynamic modulus increases with the increase of the loading series; when the frequency is greater than 7 Hz, there is no obvious law of the dynamic modulus with the loading series.