Study of Ground Treatment on Improvement of Pile Foundation Response in Liquefiable Soils

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Chen Yulong (2016). Study of Ground Treatment on Improvement of Pile Foundation Response in Liquefiable Soils. Mechanics, Materials Science & Engineering, Vol 5. doi:10.13140/RG.2.1.2504.0140

Authors: Chen Yulong

ABSTRACT. In light of the disastrous the 2011 Tohoku Pacific Earthquake, the government of Japan has conducted studies to revise the seismic design code, and elevated peak ground accelerations have been adopted. Consequently, revisions on existing design to comply with the updated code are required for public projects that are still undergoing. The design safety needs to be reassessed, and implementation of strengthening measures is required if deemed necessary. For liquefaction countermeasures, ground treatment techniques that could increase the density of soils are often the preferable alternatives. The treatment usually increases the in-situ SPT-N or CPT-qc values, which in turn would increase the resistance of soil against liquefaction. For many public infrastructures in Japan supported by bored piles embedded partly or entirely in sandy soils, reevaluation of design safety against soil liquefaction would be required. In an assessment of possible retrofitting countermeasures for an infrastructure foundation, ground treatment has been considered. In this case study, effect of ground treatment on response of piles in liquefiable soils was investigated with numerical analyses using FLAC. Results provide insights into this ground treatment effect and useful information for consideration in future design or decision making.

Keywords: liquefaction, pile, ground treatment, retrofitting countermeasures

DOI 10.13140/RG.2.1.2504.0140


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