复合式基层沥青路面结构的荷载响应分析  

Analysis on the load response of compound base asphalt pavement structures

作　　者：韩海峰 李新伟 李思强 田小革[2] 吴栋[2] 

机构地区：[1]广州市高速公路有限公司,广东广州760000 [2]长沙理工大学交通运输工程学院,湖南长沙410114

出　　处：《交通科学与工程》2017年第1期18-22,99,共6页Journal of Transport Science and Engineering

摘　　要：针对3种不同基层结构型式的沥青路面结构,采用基于弹性层状体系理论的结构分析程序BISAR3.0,对荷载效应进行了分析。研究了不同ATB模量、厚度及层间粘结状态对复合式基层沥青路面结构的影响。研究结果表明:这3种结构的主承载层都是半刚性层,但是,在半刚性基层与沥青稳定碎石(ATB)间设置的级配碎石层可能会导致ATB层与沥青混凝土下面层处于受拉状态,而采用ATB与半刚性基层的复合式基层更为合理、可行。ATB层模量和厚度的变化对各层应力的影响非常有限,欲通过增加ATB层厚度来减小半刚性层底的拉应力是非常不经济的。对于ATB层的作用,应从抑制反射裂缝的角度来分析。ATB层与半刚性基层间的粘结状态对结构的响应具有显著的影响,应确保其层间处于连续状态。The load response of three different pavement structures witcourses was studied using the program BISAR3.0 based on the layered elastic structure theory.The effects of the modulus and thickness of ATB and the interfacial state on the pavement structure with the compound base courses were analyzed. The results reveal that the main bearing courses in all the structures are the semi-rigid layer, but the intro-duction of unbound graded base between the semi-grade base （SGB） and asphalt treated base （ATB） will result in tension stress at the bottom of ATB course and the lowest as-phalt concrete course.Therefore,the compound of ATB and SGB is more reasonable and practical. The results indicate that the effect of thickness and modulus of ATB course on the responses is limited, so it was pointed out that it is very uneconomic to increase the ATB layer thickness to reduce the tensile stress in the bottom of the semi-rigid layer,the role of ATB layer should be analyzed from the perspective of inhibitory action on refrac-ting crack,the bonding state between SGB and ATB has a significant impact on the re-sponse of the structure, so the continuous bonding state should be ensured.

关 键 词：沥青路面 复合式基层 荷载响应 弹性层状体系 

分 类 号：U416.217[交通运输工程—道路与铁道工程]