Research on Indoor CBR Test Method and Prediction Formula for Rockfill Materials
In order to solve the problem that it is difficult to accurately test the CBR of rock fill in the roadbed because the particle size is too large and the prediction formula is lacking,the CBR of rock fill under different skeleton/fill particle solid phase volume ratio is studied by similar gradation method and self-designed test device,and the CBR calculation formula is derived and verified based on the contact mechanics theory.The results show that the CBR of rockfill is only related to the strength of parent rock and filling density within a certain range,and it is appropriate to use the similar grading method for evaluation.With the increase of the solid-phase volume ratio of skeleton/fill particles(7∶3～3∶7),the CBR of the rockfill shows a tendency of increasing first and then decreasing,and the CBR reaches the maximum value of 335.4％when the solid-phase volume ratio of skeleton/fill particles is 6∶4.The average error rate between the calculated and tested values of the CBR prediction formula for rockfill based on the contact mechanics theory is only 4.20％,indicating that the CBR of rockfill can be predicted using this formula.
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