Oregon State University



Event Details

Geotechnical Lecture Series

Tuesday, April 2, 2013 4:00 PM - 5:00 PM

Prof Fumio Tatsuoka

Tokyo University of Science

"Geosynthetic Reinforced Soil Structures for Transportation in Japan: Recent Developments, Earthquakes, Floods and Restoration"

 Abstract : Since the end of 1980’s, geosynthetic-reinforced soil (GRS) retaining walls (RWs) with full-height rigid (FHR) facings have been constructed for significant lengths of railways and highways in Japan, many of them for high-speed train lines. Based on this technology, new GRS bridge types were developed, the latest version being the GRS integral bridge. The first GRS integral bridge was constructed 2011-2012 for a new high speed train line and several subsequent ones are under construction. During the 1995 Kobe Earthquake, a number of embankment slopes and conventional type RWs collapsed, while several GRS RWs with FHR facing for railways and roads performed very well. Based on these experiences, the seismic design code for railway soil structures was substantially revised, primarily by increasing the design seismic load, enhancing better compaction with the use of peak and residual soil strengths to be used for the evaluation of seismic performance based on estimated displacements and recommendation of reinforced soil structures (i.e., GRS RWs, GRS bridge abutments, GRS integral bridges, nailed slopes etc). A number of old structures that collapsed during the 2004 Niigata-ken-Chuetsu earthquake were restored to GRS RWs with FHR facing. During the 2011 Great East Japan Earthquake, a great number of old soil structures collapsed due to the seismic loading and the large tsunami that followed, while a number of GRS RWs with FHR facing that had been constructed at more than 90 sites in the severely affected areas performed very well. The construction of this type of GRS RW, GRS bridge abutments and GRS integral bridges is now the standard practice with railway soil structures and is presented in demonstrative case histories.

Biography: Professor Fumio Tatsuoka comes to us from Tokyo University of Science, where he is a professor of geotechnical engineering. Previously, Dr. Tatsuoka served as a Professor at the University of Tokyo for 27 years, specialized in laboratory testing of geomaterials, foundation engineering, ground improvement, and soil reinforcement, especially in context of seismicity. Professor Tatsuoka has published over 400 technical papers in refereed journals as well as receiving numerous awards, including the IGS Award, Three-time Best Paper award in Geosynthetics International, and Best Paper in Geotextiles and Geomembranes. He has served as Vice President of the International Society of Soil Mechanics and Geotechnical Engineering and President of the International Geosynthetics Society. He has given over a dozen invited/keynote lectures at major conferences.

312 Kearney Hall, 4:00pm

Kearney Hall (campus map)
312 Kearney Hall
Prof. Armin Stuedlein
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