ABSTRACT
Engineering geology conditions. Yun-Gui highspeed railway is the national grade Ι double-track railways, the design speed of 200 km/h. It has expansion road about 129.7 km, accounts for 18.3% of all, expansive soil subgrade about 23.7 km. There are weak, medium and strong expansion soils along with line, and the rainfall and evaporation are larger for in a subtropical humid monsoon climate, it has obvious seasonal characteristics of dry-wet circulation throughout the year.
