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Instrumentation layout of the centrifuge experiments in elevation (top) and plan (bottom) views.

Instrumentation layout of the centrifuge experiments in elevation (top) and plan (bottom) views.

Source publication
Conference Paper
Full-text available
This paper presents preliminary results from four centrifuge tests, performed at the University of Colorado Boulder, to evaluate the relative influence of different mitigation mechanisms provided by dense granular columns (DGC) on the seismic performance of embankments founded on liquefiable soil deposits. The first test was designed as the baselin...

Contexts in source publication

Context 1
... series of centrifuge experiments, with a prototype-to-model scale factor of 70, were performed at the University of Colorado Boulder's (CU) 400g-ton (5.5 m radius) centrifuge facility, to systematically evaluate the influence of dense granular columns (DGC) and the relative importance of the mechanisms of densification, enhanced drainage, and reinforcement, on the seismic performance of embankments founded on liquefiable soil deposits during 1D horizontal earthquake loading. Figure 1 shows the typical configuration and instrumentation layout used in these experiments. Dimensions are presented in prototype scale, following accepted scaling relations (Tan & Scott 1985, Garnier et al. 2007). ...
Context 2
... BS was considered a non-mitigated case, absent granular columns. In Test RF-DR, DGCs were encased within geotextile filters (to avoid clogging in subsequent shakes and allow water flow) and placed at designated locations shown in Figure 1. In Test RF, DGCs with geotextile filters were encased within a thin (0.2 mm-thick) latex membrane to prevent drainage while providing shear reinforcement. ...
Context 3
... A r =10%, based on equation (1), the post-improvement (N 1 ) 60 value was estimated and converted to an equivalent relative density (D r ) for the soil surrounding the columns after installation. This resulted in D r ≈ 80% noted previously for the middle sand layer in Test RF-DS (see Figure 1). Both Monterey and Ottawa sand layers with a D r ≈ 90% were considered not to be significantly affected by DGC installation. ...