山区道路在我省现有道路中约占70％。近几年来,由于洪水较大,某些地段常被冲毁,其中以沿溪线最为严重。今后我省公路发展重点,仍以山区为主。因而总结这些区域的道路水毁原因,对改善提高道路设计,是十分有意义的。本文将根据近年来水毁的情况,探讨沿溪线路基采用何种洪水频率作为设计高程的 Mountain roads in our province about 70% of existing roads. In recent years, due to the floods, some areas are often destroyed, of which the most serious is the Yanxi River line. In future, the focus of highway development in our province is still dominated by mountains. Therefore, it is of great significance to summarize the causes of road damage in these areas and to improve and enhance the road design. Based on the situation of water damage in recent years, this paper discusses what kind of flood frequency along Yanxi subgrade is used as design elevation