Reliability index analysis of internal stability of reinforced embankment

In order to perfect the reliability design method of reinforced embankment, Monte-Carlo method was adopted to analyze the relations between the design parametric random variables and internal stability reliability index of reinforced embankment.Analysis result indicates that the internal stability is better when the density is lower, and the parameters, such as the cohesion, internal friction angle, geosynthetics tensile strength and pseudo-friction coefficient, are larger.The internal stability reliability index is sensitive to the variation coefficients of the design parameters.Except the internal friction angle, other different probabilistic models of the design parametric random variables and the design loads of different highway classes have little influence on the internal stability.Perhaps the internal stability is improved while light filler with high cohesion and big internal friction angle and high strength geosynthetics are used in the reliability design.The reliability tend to be safe while filler density accords with extremal typeⅠlargest distribution, the cohesion, internal friction angle, geosynthetics tensile strength and pseudo-friction coefficient accord with normal distribution.