Research on Difference in Acceleration on Both Sides of Drum and Optimization of Continuous Compaction Indexes
The continuous compaction control(CCC)technology,widely used in civil engineering,mainly describes the compaction state by the single side of drum dynamic response.However,differences are found on the acceleration re-sponse between each side of the drum during the compaction process,which could lead to different stiffness test results on the same location using existing testing methods.It is important to investigate the vibration differences between both sides of the drum for improving the continuous compaction testing accuracy.Based on the in-situ tests,the acceleration signals on both sides of the drum were obtained to analyze the changes and distribution laws of the acceleration peak and harmonic amplitude under different compaction passes and vibration frequencies.An average index was put forward based on bilateral response,and its accuracy was verified through correlation analysis.The results show that the difference in peak acceleration between both sides gradually decreases with the increase of the number of compaction passes,with the difference decreasing from 24.4％to 13.3％after 4 compaction passes.The fundamental frequency amplitude differences of the 1.0f in the acceleration spectrum on both sides of the drum are caused by the eccentric structure of the vibration drum.The amplitude differences of the 2.0f and 3.0fare caused by the differences about the uneven stiffness of the com-pacted soil under each side of the drum.The correlation between average index μAICV of both sides and dynamic deforma-tion modulus is 0.75,indicating that the average index can be used for subgrade compaction quality control,which can effectively improve the in-situ compaction quality accuracy compared with single side CCC indexes.
continuous compaction controlresponse differencedrum structuredynamic deformation moduluscontrol accuracyaverage index of both sides
万方数据
维普
