000011111 001__ 11111
000011111 005__ 20141205155837.0
000011111 04107 $$aeng
000011111 046__ $$k2008-10-12
000011111 100__ $$aNakamura, Atsushi
000011111 24500 $$aAn Investigation into the Effect of Drainage on Large Slope Failure During Earthquakes

000011111 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000011111 260__ $$b
000011111 506__ $$arestricted
000011111 520__ $$2eng$$aA lot of large, long-distance landslides occurred due to a big earthquake in Japan, called the 2004 Mid Niigata Prefecture Earthquake. One of these landslides occurred when a slope composed of mudstone debris failed. Slopes composed of mudstone debris have been thought to be seriously damaged by rainfall but not so seriously by earthquakes. Sampling of several intact soil blocks was done at the landslide site and the cyclic tri-axial tests on the specimens were performed under undrained conditions in a laboratory. These experimental results suggested that the cause of the failure was possibly a rapid increase of the pore water pressure inside the mudstone due to the cyclic shear during the earthquake. That is, this rapid increase of the pore water pressure made the safety factor of the slope drop considerably below 1.0, which triggered the large, long-distance landslide. We assumed the groundwater level at the time of the earthquake from the field investigation and calculated the safety factor of the large slope failure by limit equilibrium method. The groundwater level was calculated by seepage analysis (finite element method) after the drains were installed and their effect on the stability evaluated by limit equilibrium method.

000011111 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000011111 653__ $$aExcess pore water pressure, Mid Niigata Prefecture earthquake, Limit equilibrium method 

000011111 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000011111 720__ $$aNakamura, Atsushi$$iCai, Fei$$iUgai, Keizo
000011111 8560_ $$ffischerc@itam.cas.cz
000011111 8564_ $$s141908$$uhttps://invenio.itam.cas.cz/record/11111/files/04-01-0073.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 04-01-0073.
000011111 962__ $$r9324
000011111 980__ $$aPAPER