Study On The Typical Structure Of Bed And Pavement Of Rural Road For Highland And Mountainous In Yunnan

Design specifications of Bed and pavement for China are based on research result of secondary road and above of it, which are lack of pertinence to rural road. Therefore, this paper abstractly studied on the typical structure of bed and pavement of rural road for highland and mountainous in Yunnan.Based on analysis of the natural condition in Yunnan province and municipal, state road climate character, we put forward the climate characteristics of Yunnan highway three-level climatic regionalization.Through the analysis of Yunnan natural conditions, traffic conditions, soil base, present construction situation of bed and pavement and construction material, the paper put forward the typical structure of rural highway subgrade in Yunnan province, and give the suggestion of design of subgrade from the perspective of roadbed disease prevention roadbed design proposal, which aims to slove the problem of widely distributed karst road sections, landslide, expansive soil.The study on three main typical structure of rural highway in Yunnan province are the bituminous pavement, the cement concrete pavement and the stone pavement. Based on the analysis of rural highway pavement structure and damage, according to the different level of pavement structure soil base and traffic and combining with the surface of Yunnan forward basic conditions of use, the paper recommend the range of the surface and the basecourse materials of design parameters. Finally taking the accumulated equivalent axle, modulus of soil subgrade resiliency, climatic regionalization as variable, the paper put forward the rural highways typical structure of bituminous pavement, cement concrete pavement and stone pavement used in rural road in Yunnan plateau mountainous country.