Performance index and rational maintenance method of cut slope in consideration of long-term deterioration

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  • 長期劣化を考慮した切土のり面の性能評価と合理的な維持管理手法について

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In order to maintain a slope rationally, it would be necessary to elucidate the relation between a slope performance index and time. In this paper, parametric studies were carried out by means of slope models, focusing on the long-term deterioration of slopes, using such analytical methods as limit equilibrium slope stability analysis and elasto-plastic finite element analysis. The deterioration was incorporated into the analyses as chronological changes of shear strength, Young’s modulus, etc. From the results, the discussion was held on the relations between the safety factor, a performance index for slope stability, and displacements which develop at given locations of the slope surface during long-term deterioration. Also the following factors were discussed; 1) the degree of each parameter’s influence upon the safety factor and displacements at given locations, 2) at which locations displacement measurements should be taken, when computed displacements are regarded as the values obtained from field measurements. Finally, a rational maintenance method of a slope based on the stability performance was proposed although a relatively rough one.

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