Study On The Loess Compaction Principle

The loess is distributed extensively in our country, whose composition and property are exceptive .And how to improve the compact degree to enhance the roadbed quality is becoming an urgent difficult problem in the loess highway construction. Controlling the compaction quality strictly is an economic and effective method to improve the carrying and resisting distortion capacity of the loess subgrade in the construction. The researches of the loess compacted standard compacted characteristics and the pressure transferring regulation in the loess which is not only perfects the compact technology and theory, but also has engineering practical value.This text beginning with the physical property of loess analyzes and studies the pellet form and its main characteristics, discusses the method of confirming the biggest dry density. According to the heavy compact experiment, draw the compacted curve. In the laboratory and scene research, the patent production-impaction and vibration roller model designed by professor Yang Renfeng of Chang'an University is used to model static compaction adds vibratory compaction and static compaction adds the impact compaction on the loess sub- grade. Using the stress and frequency region reveled the loess dynamic performance under compaction process, and compared the two kinds of compaction by the density and the stress .The characteristics and the compacted theory in the impaction-vibration efforts are researched. In the experiment some pressure sensors are used to collect the dynamic pressure signal to inspect the entire process, and then the pressure signal is analyzed to reveal the distributing and transferring regulation in the modeled static compaction add vibratory compaction and static compaction add the impact compaction on the loess sub grade in the doors. The results indicate: the compaction adds vibration method has great influence on the compaction effect of the loess subgrade, comparing with the static compaction adds the vibratory compaction, which settles a theory for deeply research. In the end of the paper, introduced the machinery impedance theory, clarified the detailed process to solve the vibratory roller displacement equation.