Research Of Subgrade Compaction Quality Evaluation On Project Of Hunan-Guangxi High-Speed Railway Line

The high-speed railway represents the trend of the modernization of the world's railways a swell as a major achievement of transportation in the 21st century.With the rapid development of the economy and ever-increasing the demand for transportation,the construction planning of high-speed railway in our country also changed from"four vertical and four horizontal"to"eight vertical and eight horizontal",which also brought challenges to the design,construction and maintenance of high-speed railway.The lower structure of the high-speed railway is to providea railway track basis located bottom which has high smoothness,high reliability and stability for a line in order that the train runs at high speed,safety and stability.The roadbed is regarded as the basis of track structure and is important part of high-speed railway.It is the key to the safe operation of the train.Therefore,it is of great significance to strengthen the structural stability of roadbed.In the design of high-speed railways,due to the high running speed,good ride stability,high technical standards,and strict requirements for roadbeds,embankment filling and compaction should not only consider the impact of train dead load and also focus on the impact of live load during high speed operation.The article is based on the reconstruction and expansion of the roadbed project in xianggui railway line by the method of the compaction testing system.Choosingthe filling and the improved soil between the two groups of A and B to proceed the compaction test.Meanwhile,the continuous compaction quality testing was carried out.The main test content includes indicators such as ground coefficient,dynamic deformation modulus,porosity,compaction coefficient,etc..The correlation between K₃₀ and E_vd in this project is analyzed and studied using mathematical statistical methods.Conclusion:The test of E_vd can be used as the main mechanical index of the compaction quality control of railroad,reduce or replace the monitoring of K₃₀ index,and can effectively improve the construction efficiency.