Liquefaction: Assessment Methodologies and Mitigation by Ground Improvement

Author: Roy Anthony C. Luna, MSCE , Michael Paolo V. Follosco, MSCE, Alexis Philip A. Acacio, PhD, Flor Angel G. Prelligera, Maria Cristelle A. San Antonio

Presenter: Michael Paolo V. Follosco & Flor Angel G. Prelligera

Liquefaction is the phenomenon of the loss of shear strength of saturated sandy soil layers when subjected to monotonic or cyclic loading (mainly earthquake). Typical manifestations in relatively recent earthquake events include excessive settlement, sand boils, lateral spreading, and uplift of buried structures. Assessment methodologies have been developed through the years – Seed and Idriss, the JSCE Method, and the NCEER Approach. They have proven to be reasonably reliable and accurate; and sound basis in the formulation of mitigating measures and risk reduction strategies. The utilization of ground improvement techniques is a cost-effective approach in mitigating liquefaction. These include grouting and soil-cement columns, rammed aggregate piers (RAP), stone columns, vibroflotation, and dynamic compaction. This paper presents the various methods of liquefaction analysis commonly used in practice, as well as the different options for liquefaction-mitigation. A case study is presented, highlighting the importance of an exhaustive geotechnical investigation and assessment, and a well-developed and well-executed program for ground improvement works to mitigate liquefaction.


PICE Midyear National Convention 2016, Fontana Clark Pampanga

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