The Numerical Study Of The Loess Slope's Dynamic Responses Under The Construction Vibration

With the development of civil enginering construction, especially Zhengzhou to Xi'an passenger career railway start, loess high Slope has already become important, for the higher require of the high-speed railway subground , it is necessary to treat it ,now days it is more popular to use the methods of lime-soil compaction piles, occure construction source.In the construction of Zhengzhou to Xi'an passenger career railway ,after slope protection and piling action, there is a large slump near the place Lv Jia Ya Tunnel, it delay the completion, cause economic losses and danger. It has been studied and received more satisfied result in the field of dynamic response which caused by natural earthquakes, but,for artificial earthquake, especially the use of piling, it is little research using the piling . So the research on the vibrate to the slope is more practical significance.It is impossible to use the Analytic Solution to solve the loess slope dynamic response caused by the Pile driver , because of the complex terrain and the nonlinear material. But the numerical simulation method can solve it, impacted by the model size, boundary conditions, mesh size, the initial stress, material parameters, the source characteristics, and so on .In this paper, research object is rationally simplified , I build the free model and slope model to test the program correct by the numerical simulation of the free model and to prepare for the numerical simulation of the slope model. In slope model ,using Racker wave , which is as same as the frequency to the experiment, from the simulation study, we can see it has amplification phenomenon in the place of the slope peak , the simulation results is consist with the experiment data from SWS surface wave machine.