基于HWD实测数据的3种弯沉盆面积指数法对比

Contrast of 3 deflection basin area index methods in the analysis of HWD test data

针对不同形式弯沉盆面积指数法缺乏系统性对比分析和实际工程验证的问题,采用国内常见的3种弯沉盆面积指数法对中国不同地区5个机场的刚性道面弯沉测试数据进行处理,得到不同方法下各机场的基顶反应模量数值。结果表明:采用含中心弯沉值的弯沉盆面积指数法处理得到的道面基顶模量均值比改进的含中心弯沉值的弯沉盆面积指数法及不含中心弯沉值的弯沉盆面积指数法处理得到的道面基顶模量均值分别高14%~45%和9%~75%;采用不含中心弯沉值的弯沉盆面积指数法计算得到5个机场的PCN(pavement classification number)值与机场实际公布值全部吻合,可靠性高于其他两个方法,原因在于其可有效避免薄板理论无挤压假定导致的误差。以上结论可为机场刚性道面结构性能分析提供参考。

The deflection basin area index methods of different forms lack systematic analysis and reliability verification based on actual engineering.This paper conducted deflection tests on rigid pavements of 5 airports in different regions of China,and analyzed the reaction modulus of the top surface of rigid pavements base of 5 airports using three common domestic deflection basin area index methods.The analysis results show that the reaction modulus of the top surface of the base obtained by the area index method with central deflection value is 14%-45%and 9%-75%higher than the value obtained by the improved area index method with central deflection value,and accords with the area index method without central deflection value.Among the 5 airports,the reaction modulus of the top surface of base obtained by the area index method with central deflection value is completely consistent with the pavement classification number(PCN)value announced by the five case airports,and is more reliable than the other two methods.The reason is that the area index method without central deflection can effectively avoid errors caused by the no-squeeze assumption in thin plate theory.The analysis results will provide references for the analysis of airport rigid pavement structure performance.