堆石体附加质量法试验参数研究及反演应用

An Inversion Model Study of Compacted Density of Rockfill Based on Additional Mass Method

附加质量法(AMM)以其高效、精准且无损等特点,逐步应用于堆石料的压实质量检测技术研究中。对附加质量法检测堆石体碾压密度的试验参数和不同反演模型的检测精度进行了研究,得到了优化的堆石料密度检测试验参数,并根据两种相关参数和量板法,在试验场地建立了刚度相关模型(SCM)、相圆频率相关模型(FCM)和量板模型(DTM),然后在堆石坝碾压施工现场评估了各反演模型的应用效果。随着试验的进行,扩充了模型样本,并分析了扩充前后的样本平均误差和反演相对误差。结果表明:附加质量法在堆石坝碾压密度检测方面应用前景广阔,优化后的现场试验参数在应用中可行性较高,3种模型的反演结果均满足精度要求,其中DTM在五岳抽蓄工程面板堆石坝碾压密度检测中的应用效果最佳,堆石料碾压干密度反演精度最高。

The Additional Mass Method(AMM)has been gradually applied in the study of compaction quality testing techniques for rockfill because of its efficient,accurate and non-destructive characteristics.In this paper,the test parameters and the accuracy of different inver⁃sion models of the additional mass method for testing the compacted density of rockfill are investigated,and the optimized test parameters for testing the density of rockfill are obtained.Firstly,the stiffness correlation model(SCM),phase angular frequency correlation model(FCM)and digital template model(DTM)are established at the test site according to two inversion methods,namely correlation method and contour method,and then the application effect of each inversion model is evaluated at the rockfill dam compacting construction site.With the experi⁃ment,the model samples are expanded,and the sample mean errors and inversion relative errors before and after the expansion are analyzed.The results show that the additional mass method has a promising application in rockfill dam compacted density testing,the optimized field test parameters are highly feasible in application,the inversion results of all three models meet the accuracy requirements,among which DTM has the best application in rockfill density testing of panel rockfill dams in the Wuyue Pumping and Storage Project, and the inversionaccuracy of the dry density of rockfill compaction is the highest.