土体微结构分析技术在地基处理效果评价中的应用研究

Application of Soil Microstructure Analysis Technology in Estimation of Foundation Treatment Effect

首先介绍了土体微结构分析新技术的基本原理和过程,然后将该技术应用于动力排水固结和挤密碎石桩地基处理效果评价工程实践。动力排水固结和挤密碎石桩加固前后土样的微结构分析结果显示,土体空隙明显减小,地基加固效果明显,与其它常规检测方法相比,土体微结构反映的地基强度增长情况与常规检测方法反映的强度增长情况一致。其中,动力排水固结中土样空隙率减小了4.3%,空隙面积减小了5.47%,挤密碎石桩地基处理中土样空隙率减小了17.6%,空隙面积减小了30.3%。

The principle and procedure of the new technique of soil microstructure analysis are described. The technique is applied in the estimation of the effect of foundation treatment by dynamic drainage consolidation and compacted gravel pile consolidation. The results of microstructure analysis on the soil samples before and after the consolidation show that after the foundation treatment the porosity of the soil samples obviously diminish and the soft soil foundation become stronger than before. Compared to other conventional analysis methods, the soil microstructure analysis presents the same estimation results. For the soil sample of the dynamic drainage consolidated foundation, the voidage and void area decrease by 4.3% and 5.47% respectively. For the soil sample of the compacted gravel pile foundation, the voidage and void area decrease by 17.6% and 30.3% respectively.