The Study On Application Of Geogrid And Stability Of Embankments In Loess Embankments

This paper analyzes and researches the characters of loess relying on the projectof accessorial embankment of Yin-Gu freeway in NingXia province, where theprimary types and cause of formation on road's diseases are investigated. Based onthe characteristic of loess with subsidability, the designs of the trial are put forward. By using the shear resistance and tension resistance of geosynthetics, the localsettlement and lateral displacement of embankment can be decreased, and which isable to support loading equably. Consequently, the whole intensity and stability ofembankment is improved. In the paper, being dead against the problem that geogrid reinforces embankmentwhich is stuffed with loess with subsidability in NingXia province, the prototype testis done in order to mouse out the mechanism of the reinforced earth. By the prototypetest, the informations on founding rational calculational methods are accumulated. In the paper, the analysis and computational method of the earth slope's stabilityis expatiated in detail, especially Sweden slice method, Bishop method and Janbumethod. Based on above methods, circle slices formula of reinforced embankment isameliorated. The correct conclusions are drawn according to the calculation of thetypical examples. Circle slices method, with its simple principle and brief formula, is still popularlyapplied in assessment of earth slope stability. However, it includes two aspects ofweakness in practical application. The first is difficult to search the most possiblesliding surface; the second is complicated to deal with slices. So the author proposedsome compliments in circle slices method as follows: Firstly, the author proposes the formula to calculate the factor of safety based onthe definite integral method of Chen zu yu. The integral method can get precisesolution and simplify process of computing. Some cases are calculated to testify theexactitude of the method. Secondly, on the basis of a lot of present results, the author introduces a newmethod of searching the most possible sliding surface. It supposes that the circle of IIAbstractsliding surface run through the foot of slide. The factor of safety is transmitted to thefunction of x coordinate of the intersection point of the tangent at the scrap of thecircle and x axis. So, the Two-dimension area of searching is changed toOne-dimension; ameliorating traditional area of searching, the new Two-dimensionarea of searching is transformed through geometrical relation. The reliabilityis validated by calculationof the actual examples.