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http://hdl.handle.net/2122/15278
Authors: | Rollins, Kyle* Amoroso, Sara* Andersen, Paul* Tonni, Laura* Wissmann, Kord* |
Title: | Liquefaction Mitigation of Silty Sands Using Rammed Aggregate Piers Based on Blast-Induced Liquefaction Testing | Journal: | Journal of Geotechnical and Geoenvironmental Engineering | Series/Report no.: | 9/147 (2021) | Publisher: | American Society of Civil Engineers | Issue Date: | 2021 | DOI: | 10.1061/(ASCE)GT.1943-5606.0002563 | Abstract: | To investigate the liquefaction mitigation capability of rammed aggregate piers (RAP) in silty sand, blast liquefaction testing was performed at a soil profile treated with a full-scale RAP group relative to an untreated soil profile. The RAP group consisted of 16 piers in a 4 × 4 arrangement at 2 m center-to-center spacing extending to a depth of 9.5 m. Blasting around the untreated area induced liquefaction (ru ≈ 1.0) from a 3 to 11 m depth, producing several large sand boils and causing a settlement of 10 cm. In contrast, the installation of the RAP group reduced excess pore water pressure (ru ≈ 0.75), eliminated sand ejecta, and reduced the average settlement to between 2 and 5 cm when subjected to the same blast charges. Although the liquefaction-induced settlement in the untreated area could be accurately estimated using an integrated cone penetration test (CPT)-based settlement approach, settlement in theRAPtreated area was significantly overestimated with the same approach, even after considering RAP treatment-induced densification. Analyses indicate that settlement after RAP treatment could be successfully estimated from liquefaction-induced compression of the sand and RAP acting as a composite material. This test program identifies a mechanism that explains how the settlement was reduced for the RAP group despite the elevated ru values in the silty sands that are often difficult to improve with vibratory methods. |
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