公路排水系统设计参数研究

为了解决非单一纵坡条件下沟渠设计纵坡的确定问题，提出了沟渠名义设计纵坡的概念，给出了相应的计算公式。根据各类沟渠的结构重要性、损坏后果、修复可易性、使用要求以及国外的相关规定，提出了路界表面排水设施的设计降雨重现期和安全高度建议值。此外，讨论了沟管冲淤条件和允许最小纵坡的关系，对现行公路排水设计规范中的相应规定提出了修改建议。该成果可用于公路排水设计，也可为以后的规范修订提供技术支持。

Research on Design Parameters of Highway Drainage System

In order to solve the problem of choice of longitudinal gradient for ditch with multiple longitudinal profiles, the concept of namely design longitudinal gradient for ditches was put forward, and corresponding formula was given. According to the structure importance, damage consequence, repair readability, service requirements and relevant overseas stipulations related to various types of ditches, the designed repetition period of rainfall and proposed safety depth values for ground drainage facilities within road margin were proposed. In addition, the relationship between the prerequisite of discharging sediment in ditches or conduits and minimum longitudinal gradient was discussed, and the amendment suggestions to corresponding stipulations as stated in current specification of highway drainage design were advanced. The study can be directly used in the design of highway drainage, and also can provide technical support for sequential amendment to specification.