English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The 2011 off the Pacific coast of Tohoku Earthquake wreaked enormous damage to many earth structures. In particular, the damage to river dykes has attracted much attention. Conventionally, seismic damage to river dykes had been thought to be caused mainly by the liquefaction of sandy foundation grounds. During the above earthquake, however, collapse of several river dykes built on cohesive foundation grounds was observed. It is believed that the observed collapse occurred as a result of liquefaction of “enclosed saturation area” within the dykes formed by consolidation settlement of the cohesive foundation ground during construction. For interpretation/realization of the collapse mechanism through numerical analysis, it is essential not only to handle both saturated and unsaturated conditions seamlessly but also to carry out static/dynamic analyses and finite deformation analyses for simulating the processes of enclosed saturation area formation due to consolidation settlement and the subsequent dyke collapse. In addition, the constitutive equation that allows a wide spectrum of soils ranging from sandy soils up to clayey soils is also be required. Using a static/dynamic soil-water-air coupled finite deformation analysis code incorporating the SYS Cam clay model as the constitutive equation, which satisfies the above requirement, the behavior of an unsaturated embankment on cohesive soil ground during its construction and during/after an earthquake was examined. The results indicated that it is possible to simulate the formation of an enclosed saturation area within the embankment during its construction and the liquefaction of that enclosed saturation area during an earthquake. Furthermore, new knowledge that the water level within the embankment rise after the earthquake and then return back to the original ground water level, was gained.

japanese geotechnical society special publication

Soil-water-air coupled seismic behavior accompanying internal water level variation of an unsaturated embankment with an enclosed saturation area on cohesive soil ground