中文摘要：

为了揭示黄土振动压实机理，优化黄土压实作业参数，对黄土在振动压实过程中的压应力及压实能量进行研究。根据压应力时域信号，分析黄土各层的压应力分布情况；对压应力频谱信号进行分析，研究压实能量在黄土各层的分布与吸收状况及其在土层内的传递规律。分析结果表明：黄土内各层的压应力随碾压遍数的增加逐渐增大，随土体深度增加而减弱；上层土体压应力增加最快，在碾压到第9遍时达到最大，而中、下层土体在第11遍时压应力达到最大；试验用黄土的固有频率为30№左右，在此频率下振动压实效果最好；土体各层吸收的振动能量随土体密实度增加而减小，上层比中下层可获得更高的能量，并先达到其密实状态。分析结果与试验压实度结果一致。

英文摘要：

To discover the vibrating compaction mechanism and optimize the working parameters during vibrating compaction, the compressive stress and the compaction energy on the loess were studied. The distribution of the compressive stress on each layer in the loess was analyzed according to the stress signals in time domain. And the distribution, absorption and transfer of the compaction energy in the loess were analyzed based on frequency spectrum of the compressive stress signals. The results show that （ 1 ） The value of the compressive stress on each layer in the loess increases with the increasing of the rolling times and decreases with the increasing of the depth. （2） The compressive stress at the top layer increases most quickly and arrives at its maximum value at the ninth rolling time, the middle and bottom layers both arrive at their maximum values at the eleventh rolling time. （3） The natural frequency of the tested loess is 30 Hz. At this vibratory frequency the compaction effect is the best. （4） The vibratory energy absorbed by each layer decreases with the increasing of the soil density. The top layer can get more energy than the middle and the bottom layers and arrives at the density state firstly. The analysis is in ac- cordance with the experimental result of the compactness.