Abstract：Research purposes: According to centrifugal model test on two types of column-net structure，reinforcement principles and engineering effects of soil subgrade reinforced by column-net structure are studied. Also under circumstances of high embankment in Suiyu Railway project，pile-soil interaction characteristics settlement characteristics of soil subgrade of ballastless track column-net structure are analyzed.
Research conclusions: The research results indicate: (1)The geosynthetic reinforcement layer can partially afford bearing capacity but the columns make ground strengthen. The frictional resistance is main in the bearing capacity of the columns and the columns belong to frictional type pile.(2)The distance between adjacent two columns has important effect on the settlement of the subgrade. The distance can be 2 m that is proposed by the test results. The column-net structure can make accumulative settlement during construction and settlement after construction smaller. It can adapt to the ballastless track railway project.(3 ) These results may give references to subgrade design in express railway projects.
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2013, Vol. 30 
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