Ni H.,Ludong University |
Li P.,Weifang Road Administration |
Li G.,Weifang Road Administration
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | Year: 2014
The high embankment in the suburbs of Weifang, China, was constructed in deep pit filled incrementally with weathered granite. Its key construction parameters were determined by field tests of dynamic compaction under different tamping energy on the weathered granite fills. The compaction degree and mechanical properties of the subgrade before and after dynamic compaction were measured by means of such in-situ tests as compaction degree test, loading test and Rayleigh wave prospecting test. The measurement shows that the deformation modulus of the fills after dynamic compaction increases by 1.6-3.5 times compared with that before, with the deformation modulus of fills under hammer ram higher than that around hammer ram, and the numerical variation in dry density and void ratio of the fills was similar to that in deformation modulus. The dynamic compaction effect in the layer of fills within 5m deep was obvious, for the Rayleigh face-wave velocity increased significantly to 240-320m/s. Models of relationship between Rayleigh wave velocity and deformation modulus of fills or dry density were established, which could be used for testing compactness of soil-rock mixture roadbed rapidly and evaluating quality and mechanical properties of the whole subgrade.