Improvement of Filling Technology Research for High Liquid Limit Soil Bed 

Gao WANG

School of Civil Engineering, Chongqing Jiaotong University, Chongqing, 400074, China

Abstract: There are a series of problems when high liquid limit soil is directly used as subgrade filling. For example the compaction difficulty and poor water stability are of these kinds of problems. Aiming at prob-lems will occur at the process of filling the roadbed, some tests are carried out to study the compaction, water content, California bearing ratio of high liquid limit soil and the study of intensity attenuation is included. These tests are carried out to mimic the process of construction. According to the results we can find out that there will have a lot of problems when the high liquid limit soil is directly used as the subgrade filing. In view of these problems, I put up a method to solve these problems. The proposition is that high liquid limit soil can be directly used as the road bed filling and some problems can be solved by modifying high liquid limit soil with sand. The properties of high liquid limit soil can be greatly improved by using this kind of method and these problems will not occur any more. In addition to these results, I consult the related documents for fur-ther study on high liquid limit soil. The results of these documents are concurred with what I have found and the method I proposed are in line with what they have proposed. The results show that the properties of high liquid limit soil can be greatly improved by modifying it with sand. After modifying with sand, it can be di-rectly used in upper and lower embankment. Regions which are full of this kind of soil can benefit a lot by us-ing this method in the process of construction and the quality of the project can be improved easily.

Keywords: Road engineering; High liquid limit soil; Subgrade filling; California bearing ratio; Improved by sand