Toshihiro HORIKOSHI
A Study on Failure Forecast of Soil Structure that Considers Shearing Strength Change by Infiltration
Satoru OHTSUKA
This analytical technique reaming does the stability analysis by nonstationary saturation unsaturated seepage flow analysis (Soil Plus Flow) and the rigid plastic finite element method, and there is a feature such as being able to calculate the shearing strength change according to the saturation fraction and the safety rate at which the seepage flow is considered
To verify the validity of this analytical technique, the case with the model experiment was analyzed.
If quantitative evaluations of the space pressure head and the degree of saturation etc. were possible according to the nonstationary saturation unsaturated seepage flow analysis, it was confirmed to obtain an analytical solution that the collapse time and the collapse form are near actual behavior.
The simulation of the Phenomenont of the Kumamoto Prefecture Minamata City Tacaracawauti mud flow disaster that had occurred as an analysis of the case with the natural slope in July, 2003 was executed based on an actual collapse case.
The influence of the antecedent precipitation on this collapse was clarified by considering the cohesive soil of the low-intensity that developed to the weathering characteristic and the upper part of the tuff breccia of this layer.
The case analysis is piled further to apply to a real slope as a collapse forecast, and the establishment of the decision technique of an appropriate parameter is a problem.
The simulation of the Phenomenont of the Igarashicawa embankment where Yabtstsmi had been done as an application example to the river embankment due to damage by a flood by 7.13 Niigata 2004 year was executed based on an actual collapse example. The presumption geological features section in the Yabtstsmi part is the dead
end ground where the gravel bed disappears.
It was shown that the breakdown by Hebing occurred in the ground even if shearing strength of inside base was considered as a result of the analysis by the numerical analysis.
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