总弯沉比及其在机场刚性道面板底脱空判定中的适用性

Total Deflection Ratio and Its Applicability in Void Identification of Airport Rigid Pavement

摘要:

提出了一种板底脱空判定弯沉指标——总弯沉比（R_TD），分析了其理论特征；为探究R_TD在机场刚性道面板底脱空判定中的适用性，基于Abaqus有限元软件建模，以弯沉比和截距为对比对象，计算分析了道面结构参数、接缝传荷能力和脱空参数等对指标的影响。结果表明：相比弯沉比和截距，R_TD与道面结构参数相关性更高，可据此建立相对精确的判定标准；此外，R_TD在对脱空参数敏感的同时可避免接缝传荷能力与板底脱空的耦合影响。综合而言，R_TD在机场刚性道面板底脱空判定中具有更好的适应性。

Abstract:

A new deflection index， total deflection ratio（R_TD）， was proposed for v oid identification，whose theoretical characteristics were analyzed. To investigate the applicability of R_TD in void identification of airport rigid pavement， finite element models were built using Abaqus. The influences of pavement structure parameters， joint load transfer capacity and void parameters on deflection indexes were analyzed. The results show that， compared with the deflection ratio and intercept， R_TD has a higher correlation with pavement structure parameters， and a relatively accurate criterion can be established based on the higher correlation. In addition， R_TD is sensitive to void parameters and can avoid the coupling effect of joint load transfer capacity and void beneath slab. Overall， R_TD is more applicable in the void detecting of airport rigid pavement.