| In the current, the technique of dynamic compaction method processing fill foundation in our country engineering construction have applied more and more widely, because dynamic compaction method has the advantages of simple construction better reinforcement effect and the more economic using, the world paid attention by engineering. However, the study of the theory of the dynamic compaction method is far behind the engineering practice, so many problems know in-depth, and it is more dependent on exprerience, this greatly limits the promotion application and development of dynamic compaction method. Therefore, this paper combining theory research, data analysis and numerical simulation methods analysis the dynamic characteristics of fill foundation and after dynamic compaction, the main includes the following content:(1) This paper preliminarily understands reinforcing foundation with dynamic compaction method, masters the development historyćpresent situation and the future trends of the study, and sum up them.(2) This paper discusses the soil reinforcement mechanism of dynamic compaction method, and summed up the consolidation mechanism of fill soil.(3) This paper discusse numerical analysis of dynamic compaction method processing foundation.based on ANSYS/LS-DYNA software, using elastic-plastic constitutive relationship, this paper establish the3d entity model. in view of the existing deformation damage in the consolidation, this introduces the large deformation theory, this paper analyses distribution and change rule of mass stress, strain and vibration velocity and the vibration acceleration of soil in the process of dynamic compaction.(4) This paper studies the affecting factors of the effect reinforcing depth under dynamic compaction through numerical simulation, verify numerical simulation results based on the testing data of three consolidation foundation engineering, and prove the numerical simulation coincide with the engineering practice. |
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