平原水网区公路的病害分析

计算分析了平原水网区1级以下公路的病害问题。研究认为,重载交通、不合理的路面结构、较低的路基高度、较高的地下水位,是平原水网区1级以下公路早期病害的关键原因。采用多孔隙骨架密实型水稳碎石基层,或水泥石灰土碎石基层,可有效延长路面结构疲劳寿命。沥青碎石基层并不是最理想的基层结构。考虑重载交通的影响,粉性土路基的最小填土高度应在2 m以上。当路基高度难以满足要求时,应加大地基的处理深度。高地下水位对基层和底基层,尤其是对底基层的疲劳寿命具有很大的影响。

Distress of Highway in Water Net Plain District

The distress of highway except expressway in water net plain district is studied.The main reasons of the damage are unreasonable pavement structure,lower roadbed and higher groundwater.Using meshy dense frame cement macadamix base or cement lime soil base,the life of pavement structure can be extended obviously.Because of the expensive manufacturing cost,and shorter fatigue life,black base is not the most suitable base for highway.The height of the silt roadbed should be over 2 m to bear heavy traffic.The ground base should be compacted deeper to meet the corresponding force influence on the roadbed.As when the water table is higher,the fatigue life of base and sub-base,particularly the fatigue life of sub-base will be shortened obviously.