Finite element stability calculation method for filling slope of composite foundation

Abstract

The invention discloses a finite element stability calculation method for a filling slope of a composite foundation. The method comprises the following steps that firstly, rock-soil physical and mechanical parameters of all materials are determined through a field test or an indoor test; 2, determining the arrangement form, the arrangement interval and the pile body diameter of the pile body; and3, calculating the cohesion Cc of the composite foundation, the internal friction angle phic of the composite foundation, the elasticity modulus Ec of the composite foundation and the volume weight gammac of the composite foundation within the pile body arrangement range according to the following formula; 4, establishing a filling slope finite element model with a composite foundation, calculating soil parameters of a composite foundation area through the calculation result in the step 3, and calculating the slope stability safety factor FOS through a strength reduction method. Compared withthe prior art, the method has the advantages that compared with a finite element model for establishing a complete pile body, the calculation precision of the method does not exceed 3%; 2, the calculation time of the method only needs to establish 1 / 10-1 / 8 of the finite element model calculation time of the complete pile body;

Description

technical field [0001] The invention relates to a side slope stability calculation, in particular to a finite element stability calculation method for a composite foundation filling side slope. Background technique [0002] There are usually two calculation methods for the calculation of the slope stability of composite foundation fill, one is the limit equilibrium method used in engineering, and the other is to use finite elements to establish a complete pile model for analysis. When the limit equilibrium method is used to calculate the slope stability of composite foundation filling, the result of the simplified Bishop method is too large, while the result of the Swedish arc method is too small; although the finite element model of the complete pile body is established, the calculation result is very high, but due to the pile The body is usually circular, which will cause the local mesh density of the pile body and the surrounding soil to be too large, requiring a long cal...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for calculating the finite element stability of a composite foundation fill slope to solve the problems of low accuracy of the calculation results of the existing limit equilibrium method and time-consuming calculation of the complete pile finite element model

Images