It briefs the basic properties of cement improving soil,analyses the reason of the quality problems in road foundation improving soil,summarizes the construction experience of cement improving soil,and analyses the problem reason of cement improving soil and the things that should be paid attention in construction,which accumulates the construction experience of cement improving soil.

Test Study on the Effect of Cyclic Dry-wet Process on the Fatigue Strength of Cement-soil;

Research purposes:Cement and lime-improved loess are used as the backfill of the subgrade in Zheng-Xi passenger dedicated railway line,the partial compactions of cement-soil are very difficulty satisfy the design request,but its mechanics satisfied the design request all.

Cement-soil is an important filling material used in the railway subgrade engineering.

The cement improved soil is a kind of important fill material used widely in construction of railway subgrade.

In order to enlarge the usage extent of base materials of rapid transit railway foundation, the dynamic triaxial test is made on cement-improved soil.

In result,test data were obtained of permeability coefficient of reconstituted specimens of cement-improved soil,frost-heave ratio and thaw settlement ratio under open-system freezing conditions for 9 cement mixing amount.