Abstract
The reinforcement effect of geogrids is exerted through the fixing and occlusion with the surrounding soil to ensure the stability of reinforced structure. Based on the friction reinforced mechanism, the geogrids play the role of anti-shear and anti-pulling. So the indexes of interface strength identified by shear and tensile tests are usually used to conduct the stability analysis of reinforced structure. At present, the same indexes of interface strength areadopted in the stability analysis of reinforced structure, where only one of the anti-shearing action or anti-pulling effect of geogrid is considered, which is separated from the practical stress state of geogrids and has certain limitation. To solve the problem, the paper adjusts the interface indexes of geogrids based on the potential sliding surface and the stress state of geogrids when the failure happens. So the method of stability analysis is concluded where cyclic iterative analysis is carried out till the interface characters of geogrids and the unstable mode of the whole structure are the same. The calculation examples of reinforced soil slope in the paper shows that the method can fully reflect the reinforcement of geogrids and can complete the adoption of numerical method in the stability analysis of reinforcement structure.
Highlights
The reinforcement structure of geogrids is widely used in various soil filling engineering due to its feasibility and low price
The same indexes of interface strength are adopted in the stability analysis of reinforced structure, where only one of the anti-shearing action or anti-pulling effect of geogrid is considered, which is separated from the practical stress state of geogrids and has certain limitation
The above analysis show that the interface exerts shear or tensile or both under different stress states, so only considering one of the anti-shearing action or anti-pulling effect of geogrid is limited in the stability analysis of reinforced structure
Summary
The reinforcement structure of geogrids is widely used in various soil filling engineering due to its feasibility and low price. The studies on the interface features of geogrids between filling soil are based on the reinforced theories of friction, where the indoors experiment is most common, including direct shear and tensile experiments. The paper first studies the failure mode of reinforcement structure with geogrids through FEM strength reduction. Whether it is shear or tensile function happens on the geogrids interface is identified through the potential sliding surface, so as to ensure the interface of geogrids can exert its function reasonably. Based on the mode of potential sliding surface and the stress state on the geogrids, the interface parameters can be adjusted to form cyclic iterative analysis till the interface features are the same with the unstable failure mode of the whole structure, where the iterative analysis is completed
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