6.斜面崩壊発生時期の予知

概要

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Through full-scale experiments, it was found most promising as a means of forecasting the time of slope failure, to measure surface strain of the slope. From this fact, it was required to know creep-rupture characteristics of soil. Then, creep-rupture tests of soil were carried out in the laboratory, and a definite relationship that creep-rupture life is inversely proportional to steady-state strain rate in the secondary creep range was found. This relationship is independent of the kind of soil or testing methods used for the tests, and valid for test results carried out in foreign countries. The relationship can be further extended to the tertiary creep range, and utilized conveniently with the aid of graphical analysis. The relationship was finally examined through the data obtained from field measurements of slope failure at several sites, and was found good adaptability to these results. On the basis of these facts, the author would like to propose a means of forecasting the time of occurrence of slope failure, that is to say, rough estimation from steady-state strain rate in the secondary creep range, and precise estimation from optional strain rate in the tertiary creep range.
社団法人地盤工学会の論文
1969-02-25