The Settlement Calculation Method Of Loess-filled High Embankment

With the increased economic continuous growth and the fast of development the highway, the structure of high fill embankment seems inevitable and become one common form of road engineering in mountainous area construction. The loess filler as the main filler of high embankment also often appear. For high fill embankment, the amount of compression of packing weight should not be ignored. Therefore, in order to ensure the safe operation of the embankment, it is necessary for settlement of high embankment is studied. A large number of domestic and foreign scholars about settlement calculation method has a certain research. In view of loess-filled high embankment settlement calculation method is not unified,perfect. Still need to further research and discussion.To explore the loess filler of high fill embankment settlement calculation method.This article mainly about a loess filler of high fill embankment of the loess area in the road of yanjiafeng,taiyuan city,Shanxi Province as an example. At the conclusion of previous studies, In this paper,the study mainly on three aspects from indoor geotechnical test, the scene in situ monitoring and finite element simulation analysis research. The specific contents and conclusions are as follows:1. The deformation characteristics of loess filler. Through the compaction test, consolidation compression test, etc. To analyze the mechanical characteristics of loess filler and study the physical indexes of the compaction loess and deformation parameters. The coefficient of compression deformation affected by water content and pressure is discussed, with the increase of water content and pressure, compression deformation coefficient increases.2. The fitting formula of Es- P power function curve.By finishing a lot of compression test data, the compression modulus and pressure curve at all levels with logarithmic function, power function, linear function fitting. The fitting results: the fitting curve of power function is consistent with the actual, correlation is best and expressed by the formula of Es=aPb.3. The settlement calculation formula of loess-filled high embankment. Analysis the deficiencies and defects of common method. Combined with the fitting formula of Es- P power function curve. The layering fill characteristics of the embankment and compression modulus changing with actual pressure interval is considered. Based on a power function fitting Es- P curve improved the calculation method of stratified summation method is proposed.4. In situ monitoring of subsidence of loess high embankment. To as long as 400 days of high fill embankment settlement in situ monitoring, and collected a large number of measured data. The rule of loess high embankment settlement deformation is explored, and compared with the settlement calculation values. Through the ratio of the measured values and calculated values as a result, put forward a correction coefficient formula is related to the depth of fill and it is suitable for the loess filler the settlement of high embankment.. The modified layered summation method can be used as a simple and reliable method,it is worthy of promotion on similar loess filler of high fill embankment settlement calculation practical method.5. Conducted a supplementary analysis for the settlement of high embankment by the finite element. Actual engineering of the embankment model are established. The settlement of high embankment deformation law are analyzed. Simulation analysis found that the vertical displacement of the largest in the center of place,from the bottom of the embankment 1/3 ~ 1/2 location. Lateral displacement of embankment slope in the form of approximate "parabola", the maximum lateral deformation occurred near the embankment slope away from the bottom 1/3 ~ 1/2 location,and consistent with the actual embankment deformation law. To prove that the finite element numerical analysis method can also be used to simulate the analysis of its compression deformation of embankment. It can be used as guide the design and construction of high fill embankment and subsidence control.