甘肃国际陆港中心区道路路面结构优化设计研究

Study on Optimal Design of Road Pavement Structure in Central Area of Gansu International Land Port

为了确定适用于甘肃国际陆港中心区道路的路面结构,根据当地气候环境、路面类型确定了五种典型路面结构组合。采用路表弯沉、半刚性底基层层底拉应力、沥青层永久变形、低温开裂指数、半刚性基层疲劳寿命、路面造价等参数表征路面性能,通过模糊数学对五种典型路面结构进行综合评价。结果表明:结构三的弯沉值最小,路面整体强度较好;结构一底基层层底拉应力最小,基层抗开裂性能最好;结构一的底基层疲劳寿命最大,具有较高的抗疲劳性能;结构四造价最低,具有较好的经济性。综合评价表明结构五的综合性能最优,综合评价结果为0.95,针对甘肃国际陆港中心区道路所处的气候环境及交通特点,最适用于该区域的路面结构为结构五。

In order to determine the pavement structure applicable to the roads in the central area of Gansu International Land Port,five typical pavement structure combinations are determined according to the local climate and pavement types.The pavement performances are characterized by the parameters such as road surface deflection,bottom tensile stress of the semi-rigid base layer,permanent deformation of the asphalt layer,low-temperature cracking index,fatigue life of the semi-rigid base layer,and pavement cost.Five typical pavement structures are comprehensively evaluated by fuzzy mathematics.The results show that the deflection value of pavement structure III is the smallest,the overall strength of the pavement is better.The bottom tensile stress of subbase layer of structure I is the minimum,and the cracking resistance of base layer is the best.The fatigue life of subbase layer of structure I is the greatest with higher anti-fatigue performance.Structure IV has the lowest cost and better economy.The comprehensive evaluation shows that the comprehensive performance of the structure V is the best,and the comprehensive evaluation result is 0.95.According to the climatic environment and traffic characteristics of the roads in the central area of Gansu International Land Port,the pavement structure most suitable for this area is the structure V.