Abstract
The cutting bedding defect of expansive soli is one of the most difficult problems in railway constructions. Based on analysis results of the character and mechanism of subgrade disease, semi-rigid waterproof and drainage structure layer is researched, fully-enclosed subgrade is designed. Based on work of predecessors, the article simplify the train load equation and study the dynamic characters of new cutting and bedding. The results show that laying waterproof and drainage structure can increase the speed of decay of dynamic stress in the bedding, decrease the dynamic displacement of bedding surface substantially, and make the standard of high speed railway.
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