季冻区沥青路面横向裂缝分布规律研究

RESEARCH ON TRANSVERSE CRACKS DISTRIBUTION OF ASPHALT PAVEMENT IN SEASONAL FROST REGIONS

半刚性基层沥青路面非荷载型裂缝大量存在,特别是在季冻区,沥青路面的横向裂缝形成原因、形态特征和发育扩展情况更复杂,对路面的寿命和服务水平产生重要影响。在哈尔滨绕城高速公路西环段选择典型路段,对其横向开裂情况进行连续六年观测后,分析了横向裂缝演化规律,指出裂缝间距服从对数正态分布。建立的模型对沥青路面裂缝主动控制具有启发意义,也可用于评价路面的服务水平,制定相应的养护策略。

Non-load-type cracks exist on semi-rigid asphalt pavement in quantity,especially in the seasonal frozen zone,the causes,morphological features and developmental expansion of transverse cracks in asphalt pavement are more complex,which have an important impact on life and service levels of the road.A typical section of the West Central section on Ring Expressway in Harbin was selected,based on observation of its transverse cracking for six consecutive years,a statistical analysis on evolution of transverse cracks was made and the research indicates that crack spacing complies with lognormal distribution.The model created in this paper may be enlightening for active control of asphalt pavement cracks as well as can be used to evaluate the level of roads service and develop appropriate conservation strategies.