JNIOSH

Full scale experimental test of slope failure

National Institute of Occupational Safety and Health, Japan


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People could not be aware of an increase of the potential risk of slope failure because any cracks were not seen prior to the slope failure. A developed monitoring system detected the creep phenomena of the shear strain in the shallow subsurface. 20 seconds of the time for escape was provided by the warning.
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A slope became unstable due to excavations.
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About 7 minutes of time lag existed between the last excavation and a first failure.
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A secondary failure occurred when 9 minutes elapsed after the first failure.
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Relationship between the response of sensors and the slope failure.
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