Abstract
There are a large number of high liquid limit soil distributed in southern China. As one of the special soils commonly seen in highway construction, high liquid limit soil cannot be used in subgrade filling directly due to its special engineering properties. With the idea of saving engineering investment and protecting environment, high liquid limit soil must be improved to be qualified subgrade filling material. First, detailed laboratory tests are carried out to reveal the special properties of high liquid limit soil. Then, based on the characters of high liquid limit soil, the improving tests of liquid plastic limit, unconfined compressive strength, CBR and compaction are completed by adding different percentages of quicklime and white lime to the high liquid limit soil to study the change in the physical and mechanical properties and strength. The results show that, after being improved by lime, the high liquid limit soil can be used as subgrade filling of expressway as its liquid limit, plastic index being reduced, the strength increased and the value of CBR increased remarkably, and modified effectiveness of quicklime is better than that of white lime. Through comparison and analysis of the test results, it is found that high liquid limit soil with 5% quicklime can be used as subgrade filling material for highway since it is not only economical but also qualified to meet the requirement of improvement and strength.
Highlights
High liquid limit soil is a common soil to be met in subgrade filling, and whether it can be used as subgrade filling material has always been a controversial problem to road workers [1]
The curves show: when lime is added into high liquid limit soil, California Bearing Ratio (CBR) value increases obviously, and it increases with the increase of lime ratio
From CBR test result, when lime ratio is 3%, CBR value of quicklime-treated soil is 10.6%, and that of white lime-treated soil is 9.4%, which both can meet the requirement for highway subgrade filling material
Summary
High liquid limit soil is a common soil to be met in subgrade filling, and whether it can be used as subgrade filling material has always been a controversial problem to road workers [1]. For present studies on high liquid limit soil, foreign researches mainly focus on the effect of stability and deformation after engineering. Domestic researches are mainly about the improving treatment, filling technology and basic properties of high liquid limit soil. Cao Yihai [8] carries out the practice to use lime-treated high liquid limit soil as subgrade filling material. If we choose other alternative soil for filling, it must cost greatly It would be of important theoretical significance and remarkable practical value for this research to take indoor experiments on the engineering properties of and lime-treatment effect on the high liquid limit soil from Yunfu-Wuzhou section, and study the change laws of the physical and mechanical properties and strength to make it qualified filling material
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