GeoMechanics Laboratory
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Professor Kinya MIURA（E-mail：k-miura@ace.tut.ac.jp）
Lecturer Tatsuya MATSUDA （E-mail：t.matsuda@ace.tut.ac.jp ）http://www.geomech.tutrp.tut.ac.jp/
Geotechnical engineering, seabed, structural foundations, stability analysis, seismicresistant design, wave resistant design

GeoMechanics Group Laboratory has studying the stability of soil structures and structural foundations,the disaster mitigation, and the geotechnical environment. The stability of structures that residential areasand public facilities such as roads, bridges and ports are important under severe external actions including
earthquake, tsunami, heavy rain, and typhoon, is a pressing issue of civil structures for the safety andsustainability of residents lives. The geotechnical environment is also important for it, just as the atmosphereand the ocean. We are continue studying of geomechanics to resolve the issues related to these areas andpropose new technologies.97▲

Scour mechanisms of seabed due to ocean waves and the stability of coastal structures
Theme 1The study on the scour of seabed around coastal structure due to oceanwave has focusing on the tractive force by shear stress in surface seabed.
On the other hand, the instability of seabed that is decreased of thevertical eﬀective stress by acting the change of water pressure in theseabed during ocean wave is known. Our study clarify the mechanismof scour phenomenon with the synergy eﬀect between the tractive force
and a change in vertical eﬀective stress due to ocean wave, and also isinvestigate for eﬀect of stability of coastal structures.95
Investigation of scour phenomenon▲

Theme 2
Design and construction method for economical pilefoundations with short construction time for signs
The foundations for signs and traﬃc signs are almost all gravity type,using a large volume of concrete. However, not only does concrete requireconsiderable time for strength development, but construction processes
include excavation, form construction, reinforcement work and waterreplacement. The results will be a number of potential problems, such as aprolonged work period or lack of skilled personnel. In order to resolve theseissues, our laboratory has developed a design and construction method
for pile foundations. This research is supported by three technologies; “ouruniquely developed deﬂection analysis technique for a pile that can adapt
to layered ground,” “our uniquely developed compound structure for thesupport pillar and the pile” and “a construction method for a pile that forms
a soil improvement.”125

Experimental study on scour anderosion in wave-making channel▲

Theme 3 Stability of coastal structures against earthquake
and tsunami
Coastal structures have occurred catastrophic damage fromearthquakes and tsunami. However, the mechanism of thetsunami disaster for the coastal structure has not yet been
completely revealed. Our laboratory is studying the seismic
and tsunami disaster of coastal structure focusing to how themulti-scaling problems and multi-phase interactions among thesoil and water aﬀect structures, based on centrifuge tests andsmoothed particle hydrodynamics simulations with external forcesoil-structure interactions, and research the countermeasure anddesign methods based on the fracture control design.

among interaction between tractive
force and seepage force due toocean wave by explicit solution

Design-construction method for economical
piled foundations with short-term construction forsigns

Estimation of damage to caisson-type breakwater
induced by tsunami with particle based method