Robust design of continuous compaction measured value based on dual response surface methodology

The robust design of continuous compaction measured value is aimed at choosing the optimal combination of the controllable factors to reduce the sensitivity of the continuous compaction check to the noise factors, thus effectively improving the accuracy of measurement. Based on the dual response surface methodology and coupled with desirability function, the mean and variance of CMV were taken as optimization objectives to establish two second-order polynomial models. Using the Box-Behnken design method, the continuous compaction check tests were carried out in the Zhijiang construction site of Shanghai-Kunming High-Speed Railway, with amplitude, excitation frequency and roller speed as the controllable factors. The results demonstrated that the effect degree of the 3 factors on the stability of continuous compaction measured value was in the order of excitation frequency, amplitude and roller speed. Based on the desirability function, the optimal combination of vibratory compaction technology parameters was obtained: excitation frequency of 28.0 Hz, roller speed of 4.0 km/h and amplitude of 1.10 mm. The applicability and the accuracy of the optimal combination of vibratory compaction technology parameters were verified through the field test. © 2016, Editorial Office of Journal of the China Railway Society. All right reserved.