An earth-rock dam is composed of multiple materials compacted by rollers with complex operation modes, which can easily lead to the abnormal fluctuation of harmonic-ratio-based roller-integrated compaction measurement values (HR-RICMVs). Without proper handling, the abnormal fluctuation would result in unreliable assessment of compaction quality. As an attempt to address the issue of abnormal fluctuation, this study presented an improved regression model for roller-integrated compaction assessment of earth-rock dam materials. The proposed model considered the effect of vibration frequency on HR-RICMVs under different operation modes. The applicability of the improved model was verified by an analysis of correlation and reliability in different earth-rock dam materials. The results indicate that the model has significant merits in the assessment of compaction quality under complex operation modes. This research provides a potential way for the compaction quality control of earth-rock dam materials based on HR-RICMVs in future studies.
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