Experimental study on improved soil for high-speed railway subgrade

The problem of improved soil is important for hig h-speed railway subgrade. The physico-mechanical properties of cement-improve d soil, lime-improved soil, and lime-flyash-improved soil are studied in laboratoy test. The optimum mix ratio of improved soil is put forward for high-speed ra ilway subgrade in this paper. The result is confirmed by dynastic triaxial test.