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Centrifuge Investigation of Static and Seismic Behavior of Pile Foundations in Soft Clays

Centrifuge Investigation of Static and Seismic Behavior of Pile Foundations in Soft Clays. By: Chunyang Liu (University of South Carolina) Hoda Soltani (University of Oklahoma) Juan Pinilla (Terracon Consultans, Inc.) K.K. “Muralee” Muraleetharan (University of Oklahoma)

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Centrifuge Investigation of Static and Seismic Behavior of Pile Foundations in Soft Clays

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  1. Centrifuge Investigation of Static and Seismic Behavior of Pile Foundations in Soft Clays By: Chunyang Liu (University of South Carolina) Hoda Soltani (University of Oklahoma) Juan Pinilla (Terracon Consultans, Inc.) K.K. “Muralee” Muraleetharan (University of Oklahoma) Amy Cerato (University of Oklahoma) Gerald Miller (University of Oklahoma)

  2. Outline of the Presentation • Background and Motivation • Physical Model • Test Results • Conclusions

  3. Background and Motivation • Soft clays are common in seismic areas • Research on pile behavior in soft clays is very limited • Why cement deep soil mixing (CDSM) • How to transfer the research outcome to practice

  4. Physical Model (Plan View)

  5. Physical Model (Side View)

  6. Physical Model (Construction)

  7. Physical Model (Construction)

  8. Physical Model (Construction)

  9. Physical Model (Testing and Postmortem)

  10. Test Results (Cyclic loading tests) Unimproved pile GH CDSM improved pile ST

  11. Test Results (Dynamic loading tests)

  12. Test Results (Dynamic loading tests)

  13. Conclusions • CDSM is an effective way to increase the lateral stiffness of the pile foundation and the lateral displacement can be significantly reduced using CDSM. • The magnitude of the lateral displacement is directly related to the dimensions of the CDSM block. The bigger the CDSM block, the smaller the dynamic displacements. • The peak acceleration of the top of the pile during an earthquake can also be significantly reduced by the CDSM method.

  14. Acknowledgement • NSF George E. Brown, Jr. Network for Earthquake Engineering Simulation Research (NEESR) grant (Grant No. CMMI-0830328) • Zachary Thompson and Sean Price for helping with the centrifuge and laboratory tests • Karrthik Kirupakaran for performing preliminary analysis • UC Davis Center for Geotechnical Modeling

  15. Questions are welcome. Thank you for your interest. By: Chunyang Liu (University of South Carolina) Hoda Soltani (University of Oklahoma) Juan Pinilla (Terracon Consultans, Inc.) K.K. “Muralee” Muraleetharan (University of Oklahoma) Amy Cerato (University of Oklahoma) Gerald Miller (University of Oklahoma)

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