Research On Defect Mechanism Of Asphalt Pavement In BRT Dedicated Lanes Of Urban Roads In Seasonal Frozen Area Of Xinjiang Based On Finite Element ANSYS Analysis

In recent years,with the implementation of the "the Belt and Road Initiative",Xinjiang,as its important part,has witnessed rapid development of transportation industry.The traffic volume of in Urumqi,as an important transportation hub in Xinjiang,has greatly increased.Since the establishment of BRT system,its unique features of "large,long and heavy" have added to the complexity of its axial load and load;besides,the complex climate in Xinjiang makes the causes of ill asphalt pavement in BRT special lanes in Urumqi differ from those in other areas of China.Therefore,it is necessary to study the disease mechanism and structural set of asphalt pavement of Urumqi BRT special lanes.On the basis of an overall investigation,this paper particularly examines asphalt pavement of the representative BRT1 special lane in Urumqi,mainly the structural set as well as usage.This paper researches upon the two pavement structure forms of BRT special lane and collects BRT axis coefficient and axle load distribution coefficient as the basis of BRT axle load conversion.In addition,the statistical meteorological data of Urumqi of recent years are made as temperature parameters,and on this basis,the representative high temperature weather in Urumqi is chosen as the basic parameter.Then,thermos-physical parameters of asphalt pavement in Urumqi are determined according to the heat transfer theory,and ANSYS software is applied to analyze the determined asphalt pavement structure,and study the variation law of temperature field inside the pavement.The finite element software ANSYS is adopted to analyze in a simulation condition the stress field of the asphalt pavement of BRT special lane in Urumqi,and study the stress variation law inside pavement in the depth direction of pavement as well as the direction perpendicular to the driving.As for BRT special lanes in Urumqi under standard axle load and traffic load of different overload rates,ANSYS software is also used to study the mechanical response,and bring forth the nonlinear relationship between vertical displacement,vertical compressive stress,tensile stress,shear stress and axle load.Furthermore,by the finite element software ANSYS and through structural combination of different asphalt layers,this paper analyzes the influence of different asphalt layer parameters upon mechanical indexes,and studies the dynamic response of asphalt pavement structures in Urumqi BRT lanes under different structural parameter sets.Finally,from the mechanics and temperature analysis of the mechanism of failure,the structure based on finite element analysis is recommended,giving a reference and basis for future reconstruction of Urumqi BRT special lanes,as well as ideas and directions for the design and maintenance of urban BRT asphalt pavement structure in seasonal frozen areas of Xinjiang.