Centrifuge model test on earthquake-induced differential settlement of foundation on cohesive ground

Abstract

Dynamic centrifuge model test was conducted to study the earthquake-induced differential settlement of foundation on cohesive ground, and the influence of asymmetry of building was investigated. During the experiment, the overconsolidated kaolin clay ground with a three-dimensional asymmetrical structure model was shaken by a basically balanced input motion, and bender elements were used to measure shear wave velocities of model ground to reveal the soil fabric evolution during and after shaking. The test results show that, the total seismic settlement of foundation is composed of instantaneous and long-term post-earthquake settlements, and most of the differential settlement occurs immediately after the earthquake while the post-earthquake settlement is relatively uniform despite its large amplitude. The asymmetry of building affects the settlement behavior considerably. Compared with 1-or 2-dimensional structures, more evident differential settlement occurs under three-dimensional asymmetrical building during shaking, which accounts for one-half of the total seismic settlements and results in complex spatial tilting effects of foundation.soft clay, centrifuge model test, shaking table, earthquake-induced differential settlement, bender elements

Co-seismic and post-seismic behavior of an existed shallow foundation and super structure system on a natural sand/silt layered ground

“…It is clear that the total settlements of foundation are composed of instantaneous settlement during earthquake motion and long-term post-liquefaction settlement after earthquake motion, and most of the differential settlement occurs during earthquake motion while the postliquefaction settlement is relatively uniform despite its large amplitude. This result is in agreement with the results from centrifuge model test on earthquake-induced differential settlement of foundation on cohesive ground (Zhou et al, 2009). The phenomenon of the differential settlement can be explained through Figure 15, which shows the calculated vertical accelerations of Point A and B at the two sides of the structure foundation surface.…”

Soil-water coupling analysis on seismic behavior of an alternately layered sand-silt ground with different foundation system

“…Noda et al (2009) investigated the behavior of an actual alternately layered sand-clay ground and embankment-coupled system before, during and after an earthquake using finite element analysis. Zhou et al (2009) conducted dynamic centrifuge model tests to study the earthquake-induced differential settlement of foundation on cohesive ground. Other studies including tests and numerical simulations about the liquefaction and long-term settlements can be found in the references (Tokimatsu et al, 2012 andMirjalili et al, 2012).…”