冲击压实技术在处治湿陷性黄土地基中的应用

基于冲击压实技术在某高速公路工程中处理湿陷性黄土地基的应用实践,通过土工试验和现场沉降观测试验,对冲击压实前后地基土的湿陷性、干密度、孔隙比、压缩模量及路基的沉降变形随土层深度、碾压遍数的变化规律进行了系统的研究。研究表明,冲击压实能使土的物理力学性质得到很大改善,路基的整体强度得到均匀提高,使得地基产生很大的沉降,是传统压实机械所达不到的。因此,冲击压实技术在处治湿陷性黄土地基中是有效的和实用的,而且生产效率高,有很好的发展和应用前景。

APPLICATION OF IMPACT COMPACTION TECHNOLOGY IN TREATING HIGHWAY SUBGRADE OF COLLPSIBLE LOESS

This paper presents a case study of an impact technology applied in a highway embankment on collapsible loess.Based on soil test and settlement observation,the authors assessed physical and mechanical parameters of subgrade(collapsibility,dry density,void ratio,compression modulus,settlement and other parameters) and their changes with the depth of soil strata and the pressing number before and after the impact compaction..The results show that the physical and mechnical properties of soil were improved greatly by the compaction.The overall strength of highway subgrade can be enhanced.It is concluded that the impact compaction technology is effective and practical for treatment of collapsible loess subgrade.