Abstract
On July 23, 1982, 299 human lives were lost in Nagasaki prefecture due to sediment disasters such as landslides, rockfalls and debris flows caused by localized heavy rainfall. So it is important to clarify a mechanism of slope failure during heavy rainfall for sediment disaster prevention. In this paper a model experiment of slope failure due to water infiltration is carried out and the phenomenon of progressive failure of slope is observed. A finite element analysis is then applied to two cases of failed slope in Nagasaki City. This is divided into two stages, a saturated-unsaturated seepage flow analysis and a stability analysis taking into account the seepage force and the reduction of strength due to the rise in the degree of saturation. Their failure under the conditions of preceding rainfall on the day of failure, topography, geology and so on is also checked. A mechanism of slope failure during heavy rainfall has been identified. The article also demonstrates that slope failure can be predicted if a rise in the groundwater table can be detected. (TRRL)
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