BEARING CAPACITY OF GEOGRID MATTRESS REINFORCED GROUND FOCUSING ON LAYING WIDTH AND ITS EVALUATION

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  • 敷設幅に着目したジオグリッドマットレス補強地盤の支持力特性とその評価

Abstract

Mattress reinforcement is widely used in Japan to improve bearing capacity and reduce differential settlement when constructing superstructures on soft ground. In recent years, the application of mattress reinforcement methods in narrow areas has been required, and the method of determining the optimum mattress width for the loading width has become an important issue in practice. In this paper, loading tests using aluminum bar laminate were conducted to understand the bearing capacity characteristics of mattress-reinforced ground under the conditions of varying the width and thickness of the mattress for a given loading width. Furthermore, the mechanism of bearing capacity of the mattressreinforced ground was discussed by measuring the tensile resistance of the reinforcement and the deformation behavior in the model ground by image analysis. Finally, the bearing capacity of the mattress-reinforced ground was calculated using a new bearing capacity evaluation method that introduces the concept of the reduction factor of the mattress effect into the conventional design method, and the results were compared with those of the model tests.

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