不同沥青路面力学响应与室内试验分析  

Mechanical Response and Indoor Test Analysis of Different Asphalt Pavements

作　　者：杨涛 黎官福 蒙琼宗 张磊 李伏军 陶茂林 YANG Tao;LI Guanfu;MENG Qiongzong;ZHANG Lei;LI Fujun;TAO Maolin(Guangxi Guizhong Engineering Consulting Co.,Ltd.;Guilin University of Science and Technology,School of Civil Engineering;ENN Gas(Guigang)HOldings Limited;Zhongjiao Road Bridge South Engineering Co.,Ltd.)

机构地区：[1]广西桂中工程咨询有限公司 [2]桂林理工大学土木工程学院 [3]贵港新奥燃气有限公司 [4]中交路桥南方工程有限公司

出　　处：《广东建材》2025年第2期9-15,共7页Guangdong Building Materials

摘　　要：为解决我国沥青路面使用寿命普遍偏短问题,探索新的沥青路面形式。选取传统半刚性路面结构(S1)、大厚度+水稳碎石结构(S2)和大厚度+大粒径级配碎石结构(S3)三种沥青路面,计算三种结构的沥青面层、水稳基层疲劳开裂累计轴当量及各层剪应力和剪应变;用自研成型设备在室内成型出三种路面结构,并在各个层间埋设沥青应变计和土压力盒;对三种沥青路面结构进行静压分级循环加载,采用自研路面冲击设备对S1、S2进行冲击动载试验,观察各个结构破坏位置和所需荷载大小,分析两种工况下沥青路面的力学响应规律。结果表明:三种结构中,S1结构面层疲劳开裂轴当量最小,最容易疲劳开裂;S3结构的剪应力、剪应变最大,更容易产生车辙病害;静力加载后S3的破坏荷载最大,S1最小,破坏位置也不尽相同;随着冲击次数的增加,各层间的应变也随之增加,两者在沥青面层层间间的应变相差不大,但在上基层底处,S1结构应变明显大于S2结构,故S1更容易在水稳上基层处产生破坏。In order to solve the problem of generally short service life of asphalt pavement in China,new forms of asphalt pavement are explored.Select three types of asphalt pavements:traditional semi-rigid pavement structure(S1),large thickness+water stable crushed stone structure(S2),and large thickness+large particle size graded crushed stone structure(S3).The cumulative axial equivalent of fatigue cracking for the asphalt surface layer and water stable base layer of the three structures,as well as the shear stress and strain of each layer were calculated;Three types of pavement structures were formed indoors using self-developed molding equipment,and asphalt strain gauges and soil pressure boxes were buried between each layer;Perform static pressure graded cyclic loading on three types of asphalt pavement structures,and use self-developed pavement impact equipment to conduct impact dynamic load tests on S1 and S2.Observe the failure positions and required load sizes of each structure,and analyze the mechanical response laws of asphalt pavement under two working conditions.The results show that among the three structures,the S1 structure has the smallest fatigue cracking axis equivalent and is most prone to fatigue cracking;The S3 structure has the highest shear stress and strain,making it more prone to rutting damage;After static loading,S3 has the highest failure load and S1 has the lowest,and the failure location is also not the same;As the number of impacts increases,the strain between each layer also increases.Among them,the strain difference between the two structures is the largest at the bottom of the upper base layer,so S1 is more prone to damage at the upper base layer compared to S2 structure.

关 键 词：沥青路面结构 力学响应 疲劳开裂 应力应变 

分 类 号：U416.217[交通运输工程—道路与铁道工程]