14th World Conference on Earthquake Engineering

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S26 Recent Geotechnical Findings in Destructive Near-Field Earthquakes

Description:

The session on “Recent Geotechnical Findings in Destructive Near-Field Earthquakes” will be organized in cooperation with the Technical Committee No.4, ISSMGE (Earthquake Geotechnical Engineering and Associated Problems) and Asian Technical Committee No.3, ISSMGE (Geotechnology for Natural Hazards).

In the last decade, several destructive earthquakes occurred in Asia causing great loss of human lives and propertiessuch as the 1995 Kobe earthquake in Japan, the 1999 Kocaeli earthquake in Turkey, the 1999 Chi-Chi earthquake in Taiwan, the 2001 Gujarat earthquake in India, the 2004 Niigataken Chuetsu earthquake in Japan, the 2004 Sumatra earthquake, the 2005 Pakistan earthquake, and the 2007 Niigata-ken Chuetsu-oki earthquake in Japan. In most of them, most of the damage occurred because of geotechnical failure, namely, site amplification and dynamic soil response, soil liquefaction, seismically induced slope failure and fault rupture-induced ground deformations. Each earthquake has provided new findings and technical challenges to geotechnical engineers in many respects. Some of the technical subjects we have found from the recent earthquakes for further research are:

Effect of soil nonlinearity on site amplification.
Effect of surface and subsurface topography on site amplification.
Base-isolation effect in liquefied ground.
Effect of frequency-dependency of damping on site amplification.
Seismic amplification mechanism in very deep soil site.
Liquefaction strength of sandy soils containing fines and its in situ evaluation.
Liquefaction strength of gravelly soils and its in situ evaluation.
Post-liquefaction residual strength and its in situ evaluation.
Demonstration of liquefaction mitigation by soil improvements.
Evaluation method of post-earthquake slope displacement.
Evaluation method of run-out distance of failed slopes for developing hazard maps.
Effect of fault rupture on surface soil deformation and embedded structures.

In this special session, topics on new findings related to the above subjects will be addressed from the viewpoint of how to make use of the recent experiences in improving mitigation measures, upgrading current design methodologies and developing the Performance-Based Design.

Convener:
Takaji Kokusho
Professor of Civil Engineering Department
1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
Tel:+81-3-38171798
E-mail: Takaji Kokusho

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