Since the end of 19 century,especially after the World War Two,soil layer improvement has been achieved continuously progress in Hokkaido of Japan.

Experimental study on dynamic performance of red mudstone subgrade of Dazhou-Chengdu Railway under cyclic loads;

According to the settlement of embankment filled with red mudstone as mentioned, this paper carried out indoors centrifugal model testing and date calculation of embankment packed with different compaction degree of red packing material,gained the most feasible degree is 0.

Date indicates that red mudstone is easily pulverized, weathering, intenerated across water, this filling is sensitive to quantity of containing water, it is special filling , characteristic .

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.