黄土室内振动压实特性试验

Indoor test on physical-mechanical properties of loess under vibration compaction

室内振动压实是室内击实成型试件的一种新方法,能较好地模拟振动压实的特点。研究了静面压力、频率、激振力和振幅等振动压实参数对黄土压实效果的影响规律,提出了一组压实效果好并且与现有振动压路机的技术参数相符的黄土振动压实的推荐参数;对黄土的振动成型方法和成型后的物理、力学性能进行了探讨,并与击实试验做了对比分析。研究结果表明:振动压实黄土得到的最佳含水质量分数、最大干密度均比室内击实的要小,振动压实黄土的回弹模量比室内击实黄土的回弹模量要大;不同成型方式对材料的物理、力学性能影响很大。

Vibratory compaction in room is a new method of forming specimen by compressive force,which can simulate the characteristics of vibratory compaction in real construction of road. The regularities of the influence of the vibratory parameters, such as amplitude, frequency, centrifugal force, intensity on loess compaction are analyzed. The vibration parameters for good compaction are put forward; they are consistent with the parameters of the current vibratory roller. The methods for forming specimen of loess are presented, and the physical-mechanical properties of the specimens are studied, and they are compared with those of heavy rammer test. The results show that the best water content and the largest dry density for vibration compaction of loess are less than those of heavy rammer, the modulus of resilience for vibration compaction of loess is larger than that of heavy rammer. It is proved that the different methods of forming specimen have great effect on the physical-mechanical properties of loess. 7 tabs, 5 figs, 8 refs.