The practice of domestic and abroad highway construction and service shows that the damages and the lost of highway service capability have closed relation with subgradedrainage system.
国内外公路建设和运营的实践表明，公路使用性能的衰减与丧失很大程度上与路基地下水和地面水的存在有关。
2
Preventive measures are presented aiming at strengthening the subgrade and pavement drainage and the trench treatment.
从加强路基和路面排水及路槽处理等方面着手，提出防治的对策。
3
It is suitable to calculate the quantities of subgrade protection and drainage project, especially in the draft design and predesign phase of the highway or railway.