摘要
针对半刚性基层沥青路面和刚性基层沥青路面结构中普遍存在的反射裂缝问题,提出了采用开级配大粒径沥青碎石混合料(OLSM)作为裂缝缓解层的方法;利用三维有限元法,对设置普通沥青混凝土与开级配大粒径沥青碎石2种类型裂缝缓解层的贫混凝土基层沥青路面结构进行热-荷载耦合应力对比分析,并进行了试验路观测与理论计算分析。结果表明:OLSM的耦合应力明显小于普通沥青混凝土的应力;OLSM中大粒径矿料多、沥青含量少及空隙率大的结构特点有利于消解及吸收裂缝处路面应力,可有效防止或减缓贫混凝土基层沥青路面的反射裂缝,是一种可以缓解反射裂缝的有效材料。
Aimed at the problem of the reflective cracking in semi-rigid base asphalt pavement and rigid base asphalt pavement structures, a method of using Open-graded Large Stone Asphalt Mi- xes （OLSM） as the crack alleviating layer is proposed, the 3-D finite element method is used to analyze the temperature-load coupling stress for the crack alleviating layer of ordinary asphalt concrete and OLSM. The result indicates that the temperature-load coupling stress of the latter are less than that of the former. The investigation of testing road and result of theoretical calcula- tion indicate that the large mineral aggregate, low asphalt content and a great percentage of voids in OLSM are helpful to dissipate or absorb stress and strain around the crack, and OLSM can prevent lean concrete base asphalt pavement from the reflective cracking effectively, OLSM is an effective material to alleviate the reflective cracking. 3 tabs, 6 figs, 14 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第2期15-19,共5页
Journal of Chang’an University(Natural Science Edition)
基金
国家西部交通建设科技项目(200631800005)
关键词
道路工程
开级配大粒径沥青碎石混合料
数值分析
热一荷载耦合应力
反射裂缝
路用性能
road engineering
open-graded large stone asphalt mixes
numerical analysis
temperature-load coupling stress
reflective cracking
road performance
