Centrifuge Model Tests of Liquefaction-Induced Downdrag on Piles in Uniform Liquefiable Deposits
نویسندگان
چکیده
Earthquake-induced soil liquefaction can cause settlement around piles, which translate to negative skin friction and the development of drag load piles. A series centrifuge model tests were performed assess liquefaction-induced downdrag understand interplay effects (1) pile embedment pile-head load, (2) excess pore pressure generation dissipation, (3) reconsolidation ground on response during postshaking. The included a layered profile (clay, liquefiable sand, dense sand) with two 635-mm-diameter instrumented One was placed its tip at bottom deposit; other embedded five diameters into sand layer. shaken multiple earthquake motions their peak horizontal accelerations ranging from 0.025 0.4 g. For each shaking event, piles first decreased then increased reconsolidation, exceeding preshaking value. With events, net increased. maximum observed found equal drained interface shear strength calculated angle δ=30° lateral stress coefficient K=1. Larger loads smaller settlements for deep in Most occurred shaking; postshaking less than 2% pile’s diameter. mechanisms behind are described. Select ramifications concerning design soils also
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ژورنال
عنوان ژورنال: Journal of Geotechnical and Geoenvironmental Engineering
سال: 2022
ISSN: ['1943-5606', '1090-0241']
DOI: https://doi.org/10.1061/(asce)gt.1943-5606.0002817