Analysis of Stress-strain Characteristics of Geogrid Reinforced Crushed Gravel
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To study the stress-strain characteristics of reinforced cushion with multi-layer geogrids, a new calculation method was proposed. Based on hyperbolic model, the reinforced cushion was regard as a nonlinear elastomer. The effect of reinforcing geogrids was considered as an equivalent additional pressure and included into the gravel skeleton. Considering the friction effect between geogrids and crushed gravel, the calculation method of stress-strain relationship and shear strength of the reinforced crushed gravel was deduced through definite integral. The proposed method was verified by triaxial tests and the calculated results were in good agreement with the measured data. Furthermore, the key parameters influencing the shear strength, such as the total number of geogrids, the geogrids spacing and the corresponding position, were quantified through sensitivity analysis. The effects of the key parameters on the stress-strain relationship of reinforced cushion were determined. It is shown that the ability of reinforced body to resist bulging deformation is great improved by geogrids. The key parameters are the confining pressure and the total number of geogrids. With the increase of the total number and the confining pressure, the shear strength of the reinforced body increases; but the shear strength is less affected by its location. The research results can provide reference for practical projects.
Keywordsgeogrids reinforced crushed gravel stress-strain equivalent confining pressure
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