Seismic performance of strip foundations on liquefiable soils with a permeable crust: Fid-Bau Portal

Seismic performance of strip foundations on liquefiable soils with a permeable crust

Dimitriadi, V.E. / Bouckovalas, G.D. / Papadimitriou, A.G.

AbstractModern seismic codes dictate that the use of shallow foundations on liquefiable soils may be considered only after appropriate ground improvement. No further instructions are given regarding the improvement depth, or what changes if the surface layer (crust) does not liquefy. Hence, it is standard practice to improve the entire liquefiable soil layer below the foundation, whatever its depth or thickness. This study examines the seismic performance of strip foundations laying on a two-layered soil profile, consisting of a bottom layer of liquefiable sand and a (manmade or natural) permeable crust on top. Regardless of its origin, this crust does not develop (significant) excess pore pressures during shaking and is stronger and stiffer than the underlying liquefied sand. The problem is investigated numerically, through fully coupled non-linear dynamic finite-difference analyses. Following the identification of the governing response parameters, a set of multi-variable relations is developed for the approximate assessment of the seismic footing settlements and the bearing capacity degradation due to liquefaction appearing below the permeable crust.

Highlights•Seismic performance of strip footings on liquefiable soils is numerically studied.•Settlements are due to shear-induced wedge-type failures on both sides of the footing.•A multi-variable relation to assess dynamic settlements is proposed.•The footing exhibits a punch-like failure mechanism into the liquefied sand.•A multi-variable relation to assess post-shaking bearing capacity is proposed.