000018962 001__ 18962
000018962 005__ 20170118182250.0
000018962 04107 $$aeng
000018962 046__ $$k2017-01-09
000018962 100__ $$aOshima, Ryoji
000018962 24500 $$aA Study of the Evaluation Method for Embankment Collapse Risk

000018962 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018962 260__ $$b
000018962 506__ $$arestricted
000018962 520__ $$2eng$$aNowadays, existing earth structures which consist of the important infrastructural network must be needed to endure large earthquake, as well as reinforced concrete structures, metal structures. Therefore, new earth structures have been aseismic designed, but many earth structures which presents the service of Japan City Railway Network are not aseismic designed because most of them were constructed in old age. In order to improve the problems, we must consider the appropriate retrofitting strategy, so that we need the method for evaluation collapse risk of earth structures by earthquake. We investigated and analyzed the property of damaged and no-damaged railway earth structures which had experienced severe seismic excitation. Those were investigated for categorizing with height, slope gradient, geomorphologic classification, and so on. And the influence of each property was analyzed by the assumption point and verification with the database. According to the results of investigated data, the difference between damaged and no-damaged embankment has a strong correlation to geomorphologic classification, environment around the site, height of embankment, damaged experience, and so on. Furthermore, we calculated the deformation of damaged and no-damaged railway embankments in 10 areas where severe damage had occurred. We used the Newmark method (modified circular slip surface analysis) for calculating the deformation. Calculating results revealed that the railway embankments of which yielding intensity is less than 0.3 were severely damaged. In contrast, those of which the yielding intensity is over than 0.3 was severely in case the groundwater level was high, and the fine fraction content of lower embankment materials or that of upper bearing strata were less than 35%, and bearing strata contained thick organic soil layer. Being based on the investigated data and the calculation results, this paper suggests the method of evaluation collapse risk for earth structures by real phenomena caused by the 2011 off the Pacific coast of Tohoku Earthquake.

000018962 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018962 653__ $$aembankment, collapse risk, database investigation, circular slip surface analysis

000018962 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018962 720__ $$aOshima, Ryoji$$iHosoi, Manabu$$iMizuno, Kouji$$iFujiwara, Torajiro
000018962 8560_ $$ffischerc@itam.cas.cz
000018962 8564_ $$s760920$$uhttps://invenio.itam.cas.cz/record/18962/files/258.pdf$$yOriginal version of the author's contribution as presented on USB, paper 258.
000018962 962__ $$r16048
000018962 980__ $$aPAPER