High-speed Railway Roadbed Continuous Compaction Quality Control Study

Traditional compaction examination method belongs to "spot" examination with random sampling.These methods can damage roadbed structure as well as leading to missed detection. For the disadvantages of traditional compactness examination methods, countries such as Sweden and Germany had put forward continual compaction idea companied with increasingly advanced technologies.Combined with the example of Xiangtang to the Putian high-speed railroad and Haerbin to Da lian passenger transportation special line which applied the compactness examination method. It made continual compactness examination and conventional compaction examination at the same time with padding and improvement subgrade soil. The contents mainly include CMV,Evd,Ev2,K30,compacting factor K and porosity factor n. Through the analysis of examination data, the paper probes into the relevance and changeability between CMV and conventional examination target.The results estimate good relevance between the two types of subgrade soil and CMV value and conventional examination target which shows the tallies between CMV value and actual compactive effect manifesting the true Compaction situation. Moreover, the continual compaction technology has a strong compatibility to the foundation soil.At the same time, studies show that CMV value is able to demonstrate roadbed compaction uniformity. The scene examination method with continual compaction parameter CMV value primarily companioned with Evd,Ev2 can observe roadbed compaction quality in a fast, real-time, continuous way.Finally, in order to adapt to the characteristics of continual compaction examination technology, analysis from the Angle of probability, a more suitable plan for the continual compaction examination is subsequently proposed.