In order to solve the problems,such as weak bearing capacity and difficult construction of collapsible loess subgrade,the study adopts the method of engineering practice and theory to study the construction technology of collapsible loess subgrade.Based on the characteristics of collapsible loess on the site of the case project,the study proposes to treat the collapsible loess subgrade with lime soil compaction pile method.Results of site monitoring show that the maximum settlement value of lime soil compaction pile after construction is 2 mm in the 6 th month,and the maximum cumulative settlement value is 6.3 mm in the 9th month.The dry weight,porosity ratio,compression coefficient,compression modulus and collapsibility coefficient of the roadbed after construction have been significantly improved,which not only effectively improves the bearing capacity and stability of the collapsible loess roadbed,but also has a relatively large treatment depth(up to 10 m)and relatively low cost,which has good application value in the collapsible loess roadbed.
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