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Research on Cement-modified Frost Heave Characteristics of High-speed Railway Subgrade
Pages: 71-75
Year: Issue:  5
Journal: Journal of the China Railway Society

Keyword:  subgradecementgraded broken stonefrost heavefine powder;
Abstract: Seasonal frozen soil are distributed widely along the Harbin-Dalian Railway Line.The problem of frost heaving is so caused with the graded broken stone bed course of the subgrade containing different contents of fine powder,thus the requirements of high-speed railway lines for smoothness cannot be met.The water ab-sorbing quantity and amount of frost heaving can be reduced effectively by adding a certain amount of cement. In this paper,in accordance with the similarity theory,the frost heaving characteristics of the subgrade built of graded crushed stones were studied under the operating conditions of different fine powder contents,different water bearing contents and different cement admixture contents.Tests of the void-cement ratio,dampness and amount of frost heaving were made respectively corresponding to four different fine powder contents and four cement admixture contents.The results show as follows:Addition of cement can significantly reduce the rate of frost heave of graded crushed stones;the in-site rate of frost heave reaches 1%~1 .6 5% without addtion of ce-ment admixture ;along with increasing of the cement content and when going up to more than 5% ,the in-site frost heave and water-migration frost heave caused by fine powder soil are basically eliminated after graded crushed stones get hardened and the in-site rate of frost heave remains less than 0.2%;the rate of frost heave and physical mechanical properties must be considered simultaneously when adding cement;the recommended content of cement admixture is 5%.
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