基于可靠度的冻融循环下沥青路面性能  

Analysis of asphalt pavement performance under freeze-thaw cycles using reliability method

作　　者：司伟[1] 马骉[1] 任君平[1] 汪海年[1] 格桑泽仁 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,西安710064 [2]西藏自治区交通厅交通科学研究所,拉萨850000

出　　处：《吉林大学学报（工学版）》2016年第1期126-132,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家科技支撑计划项目(2014BAG05B04);西部交通建设科技项目(2013318490010);国家自然科学基金项目(51310105029)

摘　　要：在冻融循环试验的基础上,通过考虑影响因素的不确定性,对冻融作用下沥青路面结构的可靠性开展研究。采用冻融循环试验模拟了青藏高寒地区冻融作用对沥青混合性能的影响,建立了考虑冻融作用的路面结构强度可靠度方程,利用蒙特卡洛模拟方法对可靠度方程进行求解。研究得出：沥青混合料的抗压回弹模量在冻融作用下呈衰减趋势,初始冻融作用下混合料性能衰减较快,经历8-10次冻融循环后性能衰减趋于平缓;路面结构承载能力（可靠度）随冻融作用次数的增加呈衰减趋势,冻融作用对路面结构的可靠度有显著影响;路面结构可靠度随冻融循环变异系数的增加呈降低趋势。本文提出的考虑冻融作用的沥青路面可靠度分析方法可以较好地反映寒冷地区冻融作用对路面性能的影响。The reliability of the pavement structure under Freeze-Thaw（F-T）cycles is studied based on simulation test,in which various uncertainties of influence factors are taken into account.The impact of F-T cycles in Qinghai-Tibet cold region is simulated by F-T cycle test,and the reliability function of the asphalt pavement structure is built.Monte Carlo simulation method is employed to solve the reliability function.Analytical results show that the resilient modulus of asphalt concrete mixture declines under F-T cycles,the mixture performance decreases sharply in the initial F-T cycles and turns to gentle after 8to 10F-T cycles.The F-T cycle has significant impact on the reliability of the pavement structure,which decreases as F-T cycles increase.The reliability of the pavement structure also decreases as the coefficient of variance increases.An analysis method of the reliability of pavement structure under F-T cycles is proposed,which is useful to reflect the actual impact of F-T cycles on pavement performance in cold region.

关 键 词：道路工程 冻融循环 可靠度分析 蒙特卡洛模拟 沥青混合料 

分 类 号：U416[交通运输工程—道路与铁道工程]