Abstract
Compaction quality is directly related to the structure and seepage stability of a rockfill dam. To timely and accurately test the compaction quality of the rockfill material, four real-time test indexes were chosen to characterize the soil compaction degree based on the analysis of roller vibratory acceleration, including acceleration peak value (ap), acceleration root mean square value (arms), crest factor value (CF), and compaction meter value (CMV). To determine which of these indexes is the most appropriate, a two-part field compaction experiment was conducted using a vibratory roller in different filling zones of the dam body. Data on rolling parameters, real-time test indexes, and compaction quality indexes were collected to perform statistical regression analyses. Combined with the spectrum analysis of the acceleration signal, it was found that the CF index best characterizes the compaction degree of the rockfill material among the four indexes. Furthermore, the quantitative relations between the real-time index and compaction quality index were established to determine the control criterion of CF, which can instruct the site work of compaction quality control in the rockfill rolling process.
Highlights
Compaction quality is directly related to the structure and seepage stability of a rockfill dam
Results and Discussion is section focuses on analyzing the correlations among rolling parameters, real-time test indexes, and compaction quality indexes according to the dataset from the two-part experiment described above
After the data correlation analysis and signal spectrum analysis, the following conclusions can be drawn: (1) e data of ap, arms, and crest factor value (CF) are stable with low Vσ of them, and only the tendencies of ap and CF with the change of roller running speed and compacted soil thickness are consistent with the theoretical situation
Summary
Received 25 September 2017; Revised 8 November 2017; Accepted 21 November 2017; Published 20 February 2018. To timely and accurately test the compaction quality of the rockfill material, four real-time test indexes were chosen to characterize the soil compaction degree based on the analysis of roller vibratory acceleration, including acceleration peak value (ap), acceleration root mean square value (arms), crest factor value (CF), and compaction meter value (CMV). Combined with the spectrum analysis of the acceleration signal, it was found that the CF index best characterizes the compaction degree of the rockfill material among the four indexes. E rock ll material tested in the experiment belongs to cohesionless coarse-grained soil; the compaction degree in the study refers to the physical indicator of relative density. En, combined with the abovementioned study, four real-time test indexes derived from acceleration signal were chosen to characterize the rock ll compaction degree.
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