公路路面最小合成坡度是路面排水需要的最小坡度.合成坡度过小,路面排水不畅而妨碍行车,这对低等级公路影响较小,对高等级公路影响较为明显.因此公路路基纵坡设计,除考虑路基纵向排水的最小坡度外,还应注意在平曲线超高缓和段满足路面最小合成坡度的要求.近年在实际工作中,感到我国现行《公路路线设计规范》(以下简称“规范”)对最小合成坡度的规定不够确切,加之有的往往对 The minimum synthetic slope of road pavement is the minimum slope required for road drainage.The synthetic slope is too small, poor drainage of the road and impede the traffic, which has less impact on low-grade roads and more obvious impact on high-grade highways.Therefore, In addition to taking into account the minimum slope of the longitudinal drainage of the subgrade, attention should also be paid to meeting the minimum synthetic slope of the pavement in the super-gentle section of the flat curve.In recent years, in our country’s actual work, we feel that the current “Code for Design of the Highway Route” (hereinafter referred to as “the Code” The provisions of the smallest synthetic gradient is not precise enough, plus some tend to be right