The Dynamic Response Analysis Of Highway With Silty Soil Roadbed

Combining Zhengmin Highway Project, this paper firstly analyzed the dynamic characteristics of the silty soil in view of the technique characteristics of highway with silty soil roadbed, then introduced the adopted calculation methods in the paper, and systematically analyzed the dynamic response of the silty soil roadbed under the actions of the earthquake loading, autos and airplanes. It came to conclusions as follows:under the actions of autos loading, the pore pressure, displacement and stress of the slope increased with the enhanced loading frequency. Within the limits underneath the wheels, the pore pressure speeded up the accumulation, the effective stress reduced relatively, and the slope displacement augmented, the points on the slope displaced more towards the inner slope; under the actions of the airplane loading, the pore water pressure and displacement augmented with the increasing loading frequency and times, and the top of the slope caused the horizontal displacement towards the inner slope; in addition, the transient yield or the destruction region of the slope enlarged with the increasing loading frequency; with the increasing earthquake acceleration peak, the tension and yield region range of the road embankment augmented, and the possibility of the liquidity was increased as well. It specially pointed out that the liquefaction possibility of the roadbed soil couldn’t be excluded completely when the earthquake acceleration reached0.1g. Finally, it validated the analysis result rationality of the value calculation by the indoor model experiment, and disclosed the dynamic response characteristics of the highway with silty soil roadbed.In our country, silty soil caused by the hydraulic power is widely distributed in alluvial plain, river delta and coastal plain zone,Therefore, silty soil roadbed must be widely applied in our country. The research conclusion in this paper will provide some beneficial reference for the design of the silty soil roadbed in Henan and other domestic highway, as well as its construction control and put forward the practical instruction in the projects. It possesses the vital significance to assure the building quality of the road and extend the service life. The application prospect is wide.