The Applied Research Of Dynamic Compaction Method To Reinforce Collapsible Loess Foundation

Dynamic compaction is widely applied in recent years, but the study in this field is the current test mainly, although the test has accumulated a wealth of research data, The applicational study of dynamic compaction in the area of deep collapsible loess foundation is also Inadequate.And the further research on the dynamic compaction of collapsible loess foundation is important.In this paper, the main content in the following areas based on previous studies:firstly,it proposed dynamic consolidational mechanism of collapsible loess foundation based on the summary of international research about the outcome of the consolidation mechanism and combined with the special nature of the loess; secondly the paper analysis reinforcement effection of the specific projects through the experimental study on dynamic compaction of collapsible loess foundation, and analysis the reinforcing effection of dynamic compaction and strengthening mechanism by experimental data;the third, through numerical simulation and comparative analysis in between experimental data with theoretical results,it shows that LS-DYNA3D is useful and reliability when applieding to the dynamic consolidation.;lastly by changing the appropriate parameters in the process of simulating the compaction, the simulation results can optimize the parameters of the design and constructionBasic conclusion in the study:because LS-DYNA3D program has strong reliability and applicability in the numerical simulation of dynamic compaction, so it can be used to predict or analyze; numerical simulation and experimental results show that the process of dynamic compaction has obvious volatility, that reflecting the compaction energy is propagated in the form of shock wave, and finally absorbed by soil, then changed the original structure of loess.loess is Compacted in the inference of shock waves; the energy level in the same conditions, using light hammer drop distance and high-end area is large and density of the construction parameters of reinforcement is better than the hammer down and away from the bottom area of the combination of small and dense; by increasing energy level, can increase the impact of the vertical depth of reinforcement, while spacing through the rational layout compaction, soil displacement to produce deep stack, you can achieve greater soil depth and intensity.The research results provides a useful reference material for the forecast or analysis on the reinforcing effection of the dynamic compaction in the application of collapsible loess. Also it can provide a positive significance on design and construction parameters.