Finite Element Analysis On Random Permeate Field Of Soil-stone Dam

The research of influent problem of earth-stone dam has important theoretical meaning and project application value. This article based on random influent theory and numeral method for this problem will go deeply to discuss, and will apply the study accomplishment to the project example. The research of random influent fields of the earth-stone dam will have a good help to the further random reliability of hydraulic structure , calculate randomness risk through random analog algorithm quantitative analysis and put forward reliability analysis scheme to carry out optimization analysis. This article has completed following research work mainly:This article will firstly introduce the research state of the influent fields of the earth-stone dams in broad and abroad, have discussed relevant research technique with the influent of dam body .As: the Monte-Carlo random finite element method , the Taylor random finite element methods perturbation random finite element method as well as table analysis random finite element method.This article will carry out theoretical analysis of the influent fields, based on Darcy law and quality conservation principle, have studied to the continuity equation of the influent fields, and stabilize influent continuity equation is the special case. We will have Darcy law application to continuity equation to stabilize the normally basic differential equation of the influent fields, for quality isotropy dam body, above-mentioned equation is famous Laplace equation; we will have studied the given head boundary, the given boundary of rate of flow and free surface boundary with spill over surface boundary and initial condition of the influent fields.This article will carry out the imitations of the finite element method of tow-dimensions stabilize influent, analyses the basic principle and four kinds of solution, and select changing minute principle and interpolation function, have established finite element equation group. We will have focal point study for moving and fixing grid law etc., have the application to the free surface search of the no-pressure influent fields.This article carries out the imitations of the random influent field, discusses the necessary and feasibility of applying random theory of the influent fields. According to random theory, for random infiltration coefficient and random hydrostatic head, random rate of flow and random velocity parameters, we will have realized to use Monte-Carlo random finite element method to carry out random parameter imitation, and have studied the space variation of random parameter, push out the random finite element equation.Finally In this paper, program of iteration line equation and infiltration coefficient random imitation and the random influent field imitation has been made, and the results have been applied to the Huang Bizhuang dams, making a contrast with the reality observation information and the conclusions, discovering the coincide basically between them and correct of the programs. Also calculation formulas of the related quantities of influent have been and pushed out. The method adopted can satisfy the engineering requirement and is practically valuable.