Abstract：Research purposes: The melioration of expansive soil is one of the important problems in the field of expansive ground treatment, which is commonly concerned by geotechnical workers and engineers. The militancy of the clay along the Hefei-Nanjiang railway is between medium and low grade, so the clay cannot be directly used as the backfill of the subgrade and has to be ameliorated.
Research methods: In combination with the subgrade test project of Hefei-Nanjiang railway, the indoor experimental research is made on improving expansive soil with lime, the comparison and analysis are made of physical and mechanical properties and the swell-shrink characteristics of expansive soil before and after improvement.
Research conclusions: It is feasible to use lime as ameliorant of expansive soil. The component of granule, physical and mechanical properties and the swell-shrink characteristics of expansive soil with lime are obviously ameliorated, the mechanical strength and water stabilization are improved, and the requirement of the backfill of the railway subgrade can be met. The ratio of the lime is 6% in the medium-grade expansive soil and 5% in the weak-grade expansive soil. The higher-grade lime over third-grade should be used and more lime should be used when using low-grade lime.
李小青，张耀庭，邹冰川. 铁路路基膨胀土填料的石灰改良试验研究[J]. 铁道工程学报, 2006, 23(6): 24-28.
LI Xiao-qing, ZHANG Yao-ting, ZOU Bing-chuan. Experimental Study on Improving Expansive Soil Filling of Railway Subgrade with Lime. 铁道工程学报, 2006, 23(6): 24-28.
2006, Vol. 23 
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