TA project: LIQMIT

Click here to read the final report of the LIQMIT project.

Read more on the progress and test results of LIQMIT in the Joint brochure of the TA facilities.

TITLE OF PROPOSAL: Shallow foundations exposed to seismic liquefaction: a centrifuge-based study on the level and mitigation of the effects

HOST TA FACILITY: 
Turner Beam Centrifuge, Cambridge, UK

TA AGREEMENT BETWEEN USERS AND FACILITY:  
4 March 2010

STARTING DATE:
February 2011

END DATE:
December 2011

NO. OF USERS (researchers):
4

LEAD USER:
Paulo Alexandre Lopes de Figueiredo Coelho - University of Coimbra (Portugal)

ADDITIONAL USERS:
Giulia Viggiani - Università di Roma Tor Vergata (Italy)
Manuel Pastor - Universidad Politécnica de Madrid (Spain)
Stanislav Lenart - Slovenian National Building and Civil Engineering Institute (Slovenia) 

 
Model to assess liquefaction mitigating techniques.

SUMMARY OF PROPOSED RESEARCH: 

The proposed research aims at contributing to enhance current understanding on the behaviour of shallow foundations built on liquefiable deposits and to assess the accuracy of predictions of the phenomenon using current numerical tools, based on extensive experimental data obtained by element testing. The motivation of the proposal derives from the fact that even if pile foundations are often seen as a panacea against earthquake-induced liquefaction effects, past events have shown that this belief is fallacious and that shallow foundations may in some cases perform adequately. On the other hand, scientific-based understanding of the performance of shallow foundations built on liquefiable geomaterials under seismic loading able to induce liquefaction of the foundation is a critical need if the performance-based methodology is to be introduced in the design of new structures and on the retrofitting of existing structures, namely by using accurate numerical tools. In addition, the development of innovative and more economical mitigation techniques to reduce liquefaction effects depends on a proper comprehension of the problem. In order to elucidate some of the aspects of the problem that could not be clarified during previous research work performed in this field, namely by the Lead User of the Team for this research proposal and other research colleagues at Cambridge University, UK, the current research proposal includes the following main topics:
a) influence of the bearing pressure induced by the shallow foundation on its behaviour;
b) influence of the seismic loading amplitude on the behaviour of the shallow foundation;
c) influence of the non-symmetry of the seismic loading on the settlement and rotation of the foundation;
d) preliminary assessment of the optimal combination of high-capacity vertical drains and densified zones for maximum performance/ cost ratio in the mitigation of earthquake-induced liquefaction effects.

What's next

Series logo small   SERIES Concluding Workshop
  Joint with US-NEES "Earthquake Engineering Research Infrastructures

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