Different Packing High Filling Embankment Experimental Study The Dynamic Compaction Method

Depending on high embankment constucted in30m deep pit of southern extension of the Weifang Beihai road solid project, Weathered granite, miscellaneous fill have been incremental constructed in deep pit and how to improve compaction quality, decrease post-construction settlement of embankment and guarantee the stability of subgrade should be solved quickly. Dynamic compaction has been adopted to improve embankment compaction degree for its wide adaptation to the soils. However, some problems about mechanism and design theory in the reinforcement with two different soils was existed due to the shortage of the design standard and theoretical basis of dynamic compaction, and the design of its construction parameters has been experiential and confused. In this case, it has to be determined by means of small scale tests, settlement observation, numerical simulation and theoretical analysis, which is originated in China.Firstly, based on comprehending the recent study of dynamic compaction technique and engineering practice, indoor and outdoor experimentations have been done for two different soils parameters before and after dynamic consolidation such as grain gradation, dry density, permeability, compressibility, water stability and engineering mechanical character (shear strength etc).The experience formula of reinforcement range was established based on the definition of Bossion ratio. The dynamic compaction theoretical model has been established for analyzing the relations among compaction settlement, porosity and compaction degree. Effective reinforcement depth and improvement effect are obtained to determine key construction parameters such as tamping energy, compaction spacing and best hitting number by field tests of dynamic consolidation under different dynamic ram energy on two different soils. The Subgrade information before and after dynamic consolidation including bearing capacity and compaction degree is obtained to establish model of relationship between Rayleigh wave velocity and compaction degree by the means of in-situ test such as compaction degree test, Rayleigh wave prospecting, loading test, and so on, which would meet our intended purpose for detecting compactness of soil-rock mixture roadbed by measuring Rayleigh face-wave velocity variation.