| The loess is widely distributed and the soil is poor in the western region of China,and it is very important to study the selection and construction technology of Expressway Subgrade Compaction to ensure the construction quality and improve the construction efficiency in the region.Specific contents are as follows:(1)This paper analyzes the main geological features of loess area in China and the distribution of loess area,and summarizes the physical and chemical properties of loess and the load deformation characteristics for the following basic,laying the foundation for the research of compacted loess subgrade;(2)This paper analyzes the influence factors of subgrade compaction effect based on the basic theory of highway subgrade compaction,and summarizes the compaction principle,the specific construction methods and construction technology of mechanical compaction,dynamic compaction and impact compaction,providing guidance for loess roadbed indoor model test and field test for the following.(3)Based on the previous research,this chapter has carried on the large scale model test in the laboratory,and the mechanical compaction method,dynamic compaction test apparatus,method and impact compaction test content are introduced.and drowsresults of dynamic compaction method that the resonance frequency of loess sample provide guidance for Loess Subgrade Compaction through the analysis of stress and compaction;(4)This paper compares the effects of mechanical compaction,dynamic compaction and impact compaction,and the results show that the impact rolling method is more suitable for the reinforcement of loess subgrade than other methods.(5)The impact compaction method is used to test the Loess Subgrade of the project on the project of a highway in Shaanxi,and this paper obtained the most suitable impact rolling times for compaction construction of Loess subgrade based on the analysis of void ratio,coefficient of collapsibility,compression modulus,settlement and compaction degree. |
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