非饱和粘土在冲击试验下的土体参数研究

Study on soil parameters of unsaturated clay under impact test

目前对于地基土体的强夯理论研究相对较少,主要以经验为主,加固效果总体较好,但其强夯机理以及技术的发展与改进仍需进一步完善。针对这一问题,自行设计小型室内模型试验,对冲击载荷下非饱和粘土的土体参数进行研究,以便为强夯法的理论研究提供参考。研究结果表明:试验前土体疏松、含水率较高、密度较小、孔隙较大、饱和度较低;而在冲击试验后,土体颗粒发生重组,含水率略微降低,密度越靠近夯击点增加越多,孔隙比变小,饱和度提高。

At present, the theory of dynamic compaction of foundation soil is relatively small, and it is mainly based on the experience. Although the reinforcement effect is generally good. Both the reinforcement mechanism and improvement of the technology need to be further researched. In this paper, the model test is designed, and the soil parameters are measured to provide references for the theoretical study of the dynamic compaction method. The results show that before the experiment, the soil is loose with high water content, less density, higher porosity and lower saturation. After the impact experiment, the soil particles recombine and the water content decreases slightly. The closer it is to the compaction point, the more the density increases. Porosity gets smaller and the saturation gets enhanced.