Research On Influence Factors Of The Degree Of Compaction Continuous Measurement Online

Vibratory roller is the main compaction construction machinery in the road-works field, its’ principle is that a centrifugal force which made by the vibratory wheel’s eccentric vibrator high speed whirligig to reciprocating shock the pavement, which could change the station of soil particles, and then reach the arm of compaction. The compaction work is the important quality-guaranteed which for the roadbed and the road surface various structural material obtain the enough compactness. Sand cone method etc. The traditional method of check compactness of roadbed and road surface is the method of sampling. And this approach of sampling often cause the phenomenon of "the weak point" undetected. This form will cause considerable danger of the road surface and roadbed quality.The article based on the research results of the compactness detection method from domestic and foreign, and then analyzed the principle of vibration roller and the relation between acceleration and soil compaction times, proposed surveys the compaction degree of the soil with the in-vehicle compaction meter. Tests proved that the process of soil compacting constantly, vibratory roller wheel acceleration, and soil compaction are positively correlated, that is, with the increasing degree of soil compaction vibration wheel vibration acceleration is constantly increasing. The in-vehicle compaction instrument’s merit is may carry on to detect continuously, and can avoid the phenomenon of compaction being insufficient or excessive.The position and direction of installation acceleration sensors, and the frequency of sampling signal are influence on the quality of signal when sensors are collecting vibration signal. What the parameters (vibration frequency, amplitude and the direction) of vibration roller changed will cause the signal change; different materials cause different compaction demand. The article based on the condition, and carry out experiment. And use Fourier transform, filter, analysis signal and the parameters of accelerations by matlab. To confirm the parameters that is fit the instrument. And to enact the system parameters so that research the right way that detect the compaction well and truly.