土遗址夯筑支顶加固外观多以目测评价协调性,受观测者主观影响较大.因此,量化评价已成为土遗址加固效果评价的关键问题,其中色度是重要的量化指标.为有效提高夯筑支顶体表面色度检测的准确性与科学性,通过检测不同颜色比例混合土试样的色度,确定人体能认别土体色差ΔE 的极限为 3.62~4.08,提出了色度差界限ΔE=4 为土遗址夯筑支顶体色差质量控制临界值.通过现场测试发现,露天光线、边缘漏光、测试点凸凹不平均影响测试结果;光照环境与边缘漏光影响极小,当检测位置凹陷深度大于 5 mm、面积大于 50 mm2 时,色度检测将出现较大偏差.为此本研究提出了夯土遗址色度检测的限定条件,为土遗址规范化保护提供理论和技术支撑.
The assessment of appearance and coordination for earthen archaeological site reinforcements,which is traditionally done by visual inspection,is greatly influenced by the observer's subjectivity.Quantitative evaluation has become a critical issue for assessing the effectiveness of these reinforcements,in which chromaticity is a key metric.To improve the accuracy and scientific validity of chromaticity measurements on the surface of the compacted supports,tests on soil samples with varying color proportions were conducted.It was determined that the human discernible chromaticity difference ΔE is ranged from 3.62 to 4.08.A chromaticity difference threshold of ΔE=4 is proposed as the critical value for quality control of the color difference in the compacted supports of earthen archaeological sites.Field tests revealed that factors such as ambient light,edge light leakage,and uneven testing points can affect the results,while the impacts of lighting conditions and edge light leakage are minimal.The significant deviations in chromaticity measurements are occurred when the testing location has a depression deeper than 5 mm and larger than 50 mm2.Based on these findings,this study introduces specific conditions for chromaticity testing in compacted earthen archaeological sites,which can offer theoretical and technical support for the standardized preservation of such sites.