摘要
依托典型岩溶山区路面养护工程,研究了设计车道承受184~553万当量轴次后路面的病害特征和机制。结果表明,病害以裂缝为主,裂缝类型分布与地貌特征关系密切:山麓线主要是软弱坡积土路基导致的疲劳裂缝和不均匀沉降导致的横缝;山腰线主要是路基侧滑导致的斜缝、纵缝和差异沉降导致的横缝;越岭线主要是侧滑导致的斜缝和结构物周边差异沉降导致的横缝。路基尚未稳定前,2 cm薄层罩面3 a裂缝反射率约70%。路段车辙深度为2.5~8.4 mm,相对变形为2.3%~3.4%,非长上坡段的车辙深度与累计当量轴次相关性良好,拟合指数为0.377 1,路面抗车辙能力较强。
Based on pavement maintenance project of typical Karst mountain area,the disease characteristics and mechanism of pavement subjected to 1.84~5.53 million equivalent axles were studied.Research showed that the diseases of pavement were mainly cracks.Distribution of crack types was closely related to geomorphic feature.Foothill line was mainly fatigue cracks caused by weak slope soil subgrade and transverse cracks caused by uneven settlement.Midslope line was mainly diagonal and longitudinal cracks caused by landslide,and transverse cracks resulting from differential settlement.Mountain crossing line was mainly diagonal cracks caused by landslide and transverse cracks around structures caused by differential settlement.Before the subgrade had stabilized,a 2 cm thin overlay resulted in approximately a 70%reflection crack ratio after 3 years.Rut depth was 2.5~8.4 mm,and relative deformation was 2.3%~3.4%.Except for the long upgrade section,the correlation between rut depth and cumulative equivalent number of axles was significant,with a fitting index of 0.3771.Pavement has strong resistance to rutting.
作者
刘克
李城
LIU Ke;LI Cheng(China Merchants Zhixiang Roadway Technology(Chongqing)Co.,Ltd.,Chongqing 400067 China;Chongqing Zhixiang Paving Technology Engineering Co.,Ltd.,Chongqing 400067 China)
关键词
岩溶山区
路基路面综合调查
路面裂缝
车辙
山区高速公路
养护效果
Karst mountain area
comprehensive survey of subgrade and pavement
pavement cracks
rutting
mountain expressway
maintenance effect
