Application And Analysis Of Dynamic Compaction Method In High-fill Airport Foundation Treatment In Mountainous Area

In this paper,Baotou Wudangzhao General Airport is taken as an example to carry out a systematic study on the foundation treatment problems such as high fill existing in the airport construction in mountainous areas.A series of key problems,such as the selection of large stone blocks with filling height greater than 20 m and soil rock mixture material high fill foundation reinforcement material selection,layered filling method,dynamic compaction construction parameters and foundation detection method after treatment are successfully solved.Dynamic compaction method for foundation treatment has many advantages,such as simple process,fast construction speed,saving materials and engineering cost,but the theoretical research on related aspects is relatively less,and the design calculation is still on the basis of experience and qualitative.Therefore,through the research on the foundation treatment of Shiguai Wudangzhao General Airport,the empirical formula applicable to the environment is proposed,which can provide guidance for similar projects It helps.Through the dimensional analysis method,a simple and convenient formula is derived,which can quickly determine the effective reinforcement depth of foundation,the effective reinforcement depth of different foundation soil under the action of different compaction energy and the average compaction settlement of the site after dynamic compaction are calculated.Compared with the formula calculated by other researchers,the empirical formula proposed by the author is calculated The results showed that the error was the least.Based on Wudangzhao General Airport project,combined with site geotechnical and hydrogeological data,combined with airport runway design,consulting a large number of relevant literature,the theoretical basis of dynamic compaction method is obtained.According to the design grade of engineering foundation and site complexity,four test compaction areas are divided according to different filling body and different dynamic compaction energy level.The field in-situ test and soil test are combined to test the consolidation and carry out necessary tests.At the same time,through the trial compaction,in the case of certain ramming energy and other parameters,different hammer weight drop height is selected for quantitative analysis,and the conclusion that the heavy hammer should be selected is obtained,which can directly guide the actual construction of the project,and also provide certain reference for the construction of similar soil for this kind of project.The test data of field test compaction is compared with the calculation results of the derived formula,which can be used to quickly obtain the effective reinforcement depth of dynamic compaction.The empirical formula not only provides reliable basis and technical support for large-scale foundation soil treatment of Wudangzhao General Airport,but also has certain guiding significance for dynamic compaction of similar sites in the future.