非排水強度の圧密強度増加を考慮した軟弱地盤の信頼性解析

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  • Reliability Analysis of Soft Ground with Increased Undrained Shear Strength
  • ヒ ハイスイ キョウド ノ アツミツ キョウド ゾウカ オ コウリョシタ ナン

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In general, unconfined compression strength is used for stability analysis of soft ground. It is well known that this parameter has a large variability (uncertainty and randomness). The reliability analysis method is used to consider this variability. In this study, this probabilistic method is applied to the stability analysis of soft ground under a preloading embankment.<BR>When stability of soft ground is analyzed, it is often thought that undrained shear strength increases with the consolidation process. The ground discussed in this paper can be assumed to consist of normally consolidated aged clay layers. In this case, not only undrained shear strength but also consolidation yield stress is needed to calculate the strength incease. These parameters were treated as random variables in this paper.<BR>First, a statistical model of the undrained shear strength and that of consolidation yield stress were defined on the basis of the laboratory tests (unconfined compression test, oedometer test) and as a result of undisturbed soil samples. Then, it was calculated using the Monte Carlo simulation method, the transition of spatial distribution of undrained shear strength with consolidation process. Finally, the φu=0 reliability analysis was carried out and stability of the ground was estimated by reliability index β. In conclusion, the effect of strength increase on stability of the ground could be known.

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