Study On The Compaction Control And Effect Evaluation Of Silt Subgrade

Silt is not the same as clay and sand in the respect of physical and engineering properties.It has its own feature in particle size distribution, compaction principle, compaction craft, compaction control, evaluation of compaction effect. The henan silt alluviated by Yellow River has its own special feature. Its silt content is big, particle distribution is even, clay content is small, plastic index is low, capillary action is active, water stability is poor, it is hard to compact using ordinary compaction method and craft. So it is very constructive for road construction to study physical and engineering properties of henan silt, the technology of economical and reasonable compaction craft and compaction effect evaluation.This paper analyses the physical and engineering propertiesof Henan silt, studies the compaction craft of Henan silt, studies the technology of compaction effect evaluation and detection of Henan silt.This paper analyses three differences(particle size distribution, maximun dry density and the optimum water content, hydrophilicity)between Henan silt and silt in Heze Shandong, emphasis on particle size distribution. The unique physical property of Henan silt is obtained, two parameters are proposed to represent compaction property of Henan silt.The research of compaction craft of Henan silt is carried out in the first and second bid section in Zhengzhou part of 107 national road. A case of compation craft is obtained, suitable for local silt, the influence of silt variance in particle size on the compation is studied, the compaction standard of Henan silt is proposed.CBR test is conducted in the first and second bid section, the relationship between the two.parameter compation standard and CBR is obtained, the standard to evaluate compation effect and its detection method, the directive funtion that the two.parameter standard has on sugrad construction is also obtained.