路面材料典型力学参数的不确定度评定试验研究

摘要/Abstract

摘要： 为测试反映对象、仪器、方法、条件等对结果的影响,从而获取更加可靠、更加接近实际的路面材料力学参数代表值,本研究基于测量不确定度理论,以水稳碎石以及AC-16C型沥青混合料为研究对象,提出使用合成标准不确定度来代替标准差计算代表值,确定对测量结果有影响的标准方差合成公式,并对测量结果进行A类及B类不确定度评定,采用蒙特卡洛法(MCM)对评定结果进行了验证。研究结果表明:使用合成标准不确定度代替标准差计算代表值用于结构设计时更为保守,更能准确反映工程实际情况;基于测量不确定度理论获取的路面力学参数代表值,能够有效反映路面材料力学参数的不确定性,从而影响路面结构力学计算和路面后期性能的不确定性;《测量不确定度表示指南》(GUM)的适用范围较为广泛,但对于非线性测量模型以及数学模型中具有强相关分量时所得结论误差较大;相比于MCM,GUM评定过程相对复杂且容易出错。本研究结果有望为准确评定路面材料典型力学参数代表值提供参考,有助于推动测量不确定度评定理论在设计、施工、质量控制等领域的推广应用。

关键词: 道路工程, 水稳碎石, 沥青混合料, 测量不确定度, 力学参数代表值

Abstract: To test and reflect the influences of objects, instruments, methods, and conditions on results and to obtain more reliable and accurate representative values of the mechanical parameters of pavement materials, this study was based on the theory of measurement uncertainty. It used cement stabilised aggregates and AC-16C asphalt mixtures as study objects and proposed using synthetic standard uncertainty instead of standard deviation in calculating the representative value to determine the standard deviation of measurement results. The synthetic formula was employed to determine the standard variance of measurement results. The results were evaluated with class A and class B uncertainties and verified by the Monte Carlo method (MCM). The results indicate that using synthetic standard uncertainty instead of standard deviation to calculate the representative value for structural design is more conservative and accurately reflects the actual project situation. The representative value of pavement mechanical parameters obtained based on measurement uncertainty theory effectively reflects the uncertainty of the mechanical parameters of the pavement material. This, in turn, affects the uncertainty of the pavement structural mechanical calculation and the pavement performance in the later stages of the project. The “Guide to the Expression of Uncertainty in Measuremen” (GUM) is applicable to the measurement uncertainty of pavements. While the GUM has a wide range of applicability, it presents significant errors for nonlinear measurement models and mathematical models with strong correlation components. Compared with the MCM, the evaluation process of GUM is relatively complex and prone to errors. The findings of this study are expected to provide a reference for accurately evaluating the representative values of typical mechanical parameters of pavement materials, thereby promoting the widespread application of measurement uncertainty evaluation theory in design, construction, and quality control.

Key words: road engineering, cement stabilised aggregate, asphalt mixture, measurement uncertainty, representative value of mechanical parameter

中图分类号:

U414

唐利民, 龚贵恩, 彭守波. 路面材料典型力学参数的不确定度评定试验研究[J]. 硅酸盐通报, 2024, 43(11): 4240-4253.

TANG Limin, GONG Guien, PENG Shoubo. Experimental Study on Uncertainty Evaluation of Typical Mechanical Parameters of Pavement Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 4240-4253.

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