Nonlinear Finite Element Analysis Of High Filling Roadbed Settlement

As China's road construction, highway building in particular has the rapid development in mountainous and hilly areas of road construction projects, railway projects, large and medium-sized port projects, airport projects, as well as various types of sea-Wai (Lake, Bay) made to fill all works will inevitably encounter a lot of high-fill projects. Therefore, filling projects are an important geotechnical engineering that is in major types of national infrastructure projects.At present, the model based on a variety of theoretical foundation of the settlement calculation method has been the practice in many works by a wide range of applications and research, but the high filling roadbed of the settlement calculations at home and abroad not have a mature theory or algorithm. In this paper are based on previous on the basis of studies and reasonable choice of the Loess roadbed parameters, the high filling roadbed settlement (including the construction of settlement and the settlement after) calculation analysis. In this paper, research results are: (1) To consider filling a high degree of roadbed be impact on the roadbed of vertical and lateral impact of the settlement. Calculate the value of the settlement, being settlement with a high degree of relationship. Further consideration caused by the change of the terms of settlement because sloping roadbed slope of the embankment (2) From the process of starting operations, taking into account the current phenomenon of serious overloading of vehicles, analyzing vehicle loads to the impact of sub-grade settlement. Analysis of this paper, the following conclusions: Based on the results of elastic-plastic model, Revealed that the side slope 1/2 to 1/3 of a high degree of horizontal displacement be larger. The largest horizontal displacement occurred within in the embankment slope, the lateral displacement of the slope in 1/3 of slope height is a maximum value. Slope subgrade of the height and its vertical settlement is a linear approximation. With the high of the increase, the largest vertical displacement of subgrade (settlement) is in the middle road, but uneven settlement in the vicinity of shoulder is the most prominent. With the increase of high embankment construction, the subgrade largest vertical displacement and lateral displacement be similar to linear increase. Subgrade of the maximum vertical displacement and maximum lateral displacement will not affected roadbed width. (2) Changes in the roadbed slope of the circumstances, the largest lateral than no change in slope displacement lower 9 percent to 12 percent. This shows that set up multi-level slope of the embankment to greater role reduce lateral displacement and can ensure lateral roadbed slope in the relative stability and integrity. And the largest vertical displacement compared to no change less than 1 percent lower slope, the slope of the vertical displacement change had no effect. (3) In the vehicle load, the roadbed of lateral and vertical settlement increases rapidly, resulting in accelerated the reclamation of damaged roadbed.Research shows that the use of non-linear FEM analysis high filling roadbed on the deformation of numerical simulation to be effective, theoretical analysis of the results of previous research findings and consistency.