基于落锤式弯沉指标的沥青混凝土倒装结构承载力研究

The research on bearing capacity of inverted asphalt concrete pavement structure based on falling weight deflectometer indexes

福建省高速公路大量采用半刚性基层与倒装沥青路面结构,国外模量反算方法较不适合这类路面结构,易引发许多工程实务问题。又因为连续弯沉仪的发展与导入,其与落锤式弯沉仪的实务定位比较并不明确。为发展贴近福建省需求的路面承载力评估方法与了解新旧弯沉仪器的适用性问题,本文探讨各种量测弯沉的开展过程与弯沉盆参数的应用限制与适合状况,回顾与比较主要弯沉量测仪器的发展历程并分析落锤式弯沉仪的重要性。弯沉盆参数的量测目的、公式、限制条件与文献数量被讨论。针对福建省道路结构特殊性,建议使用最大弯沉值,修正后表面曲率指数,基层损坏指标与基层曲率指数去描述福建省典型路面的结构承载力。

The semirigid base and inverted asphalt concrete pavement structure was widely used in Fujian highway,and the modulus inverse computation method form overseas is not applicable for this type of pavement,and might cause many problems. For understanding the limitation and using condition of measuring deflection development and deflection basin indexes,the major development and comparison of deflection measuring devices was reviewed. The objectives,equations,limitations,and using condition in literatures of deflection basin parameters were discussed. Based on the characteristic of Fujian＇s pavement structure,the pavement maximum deflection,modified surface curvature index,modified base damage index,and modified base curvature index were suggested to illustrate the Fujian＇s flexible pavement structural bearing characteristics.