寒区BRT公交专用线路面结构特征与服役性研究  

Pavement structural characteristics and serviceability of BRT bus lanes under cold zone conditions

作　　者：徐震 贾凡[1] Xu Zhen;Jia Fan(School of Traffic and Transportation,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学交通运输学院,兰州730070

出　　处：《青海交通科技》2023年第4期59-69,共11页Qinghai Transportation Science and Technology

基　　金：甘肃省地质灾害防治专项资金计划(2023-02);甘肃省自然资源厅成果培育项目(2022-09)。

摘　　要：为了明确寒区重载客车车道路面结构特征与适用性,本文以兰州市BRT(快速公交系统)专用线为研究对象,利用多层弹性层状体系理论提出三个沥青路面结构方案[方案一(P_(1)):SMA-13+AC-20+AC-25;方案二(P_(2)):SMA-13+AC-20+ATB-25;方案三(P_(3)):砌块砖石+水泥处置层+砂砾土],并基于HPDS2017、GeoStudio 2018,围绕其服役性能(路面永久变形量、路表验收弯沉值)展开研究。结果表明:车辙是该路段的主要病害,BRT车道上更严重;P_(1)和P_(2)的路面结构均符合规范,经路面结构层参数计算和软件验算,P_(1)的抗车辙能力强于P_(2),更适合于该路段;P_(3)的设计永久变形量为28.5mm,P_(1)和P_(2)的设计弯沉值为29.3mm,因此砌块路面抗车辙病害能力优于沥青路面。结合P_(3)提出组合式方案,即BRT车站停靠处铺设P_(3)路面,车道铺设P_(1)路面。In order to clarify the characteristics and applicability of heavy-duty bus pavement structure in cold regions,this paper takes the BRT(bus rapid transit system)special line in Lanzhou as the research object,based on the theory of multi-layer elastic layered system,three schemes of asphalt pavement structure are put forward(scheme 1(P_(1)):SMA-13+AC-20+AC-25;Scheme 2(P_(2)):SMA-13+AC-20+ATB-25;Scheme 3(P_(3)):brickwork+cement treatment layer+sandy gravel),based on HPDS2017 and GeoStudio 2018,the serviceability(permanent deformation of pavement and acceptance deflection of pavement gauge)was studied.The results show that the rutting is the main disease of the road section,and the rutting is more serious in the BRT lane,the pavement structure of P_(1)and P_(2)conforms to the code,and the rutting resistance of P_(1)is better than that of P_(2)after calculating the parameters of the pavement structure layer and checking by the software,the design permanent deformation of P_(3)is 28.5 mm,the design deflection of P_(1)and P_(2)is 29.3 mm,so the rutting resistance of block pavement is better than that of asphalt pavement.Combined with P_(3),a combined plan is put forward,that is,P_(3)pavement is laid at the BRT station and P_(1)pavement is laid on the driveway.

关 键 词：路面结构特征 BRT专用线 多层弹性层状体系 路面结构层 永久变形量 弯沉值 

分 类 号：U416.2[交通运输工程—道路与铁道工程]