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- W590362209 abstract "This research deals with the evaluation of earthquake induced liquefaction susceptibility of carbonate sands, used as hydraulic fill. Existing evaluation methods are based on in-situ penetration tests (CPT, SPT etc.) and on seismic case histories at sites where silica sands are predominant. These methods cannot be implemented on carbonate sands, due to their crushable nature. Very limited experimental research has been done to evaluate the seismic performance of this type of sand which is abundant in seismically active regions (e.g. Central America). A series of isotropically consolidated undrained cyclic triaxial tests were conducted using a carbonate sand from Central America. The tested Central American carbonate sand is a poorly graded clean beach sand with highly angular grains. The performed test program was set to simulate a typical hydraulic fill structure. For this reason the carbonate samples were tested at three relative densities (20%, 50%, 80%), three effective confinements (50kPa, 100kPa, 150kPa) along with three cyclic loading scenarios represented by the cyclic stress ratio (CSR=0.2, 0.28, 0.32). The evaluation of the liquefaction susceptibility was based on the excess pore-water pressure development during cyclic loading. Cyclic strength curves were generated by plotting the cyclic stress ratios (CSR) with the number of loading cycles until liquefaction (Nf ). These curves were compared to those reported in the literature concerning both silica and other carbonate sands. Overall, the Central American carbonate sand was shown to be less susceptible to liquefaction than silica sands. While both density and confinement had a meaningful effect on its cyclic strength, the former was more influential. Furthermore, compared to Toyoura (silica) and two other carbonate sands, the density effect was less pronounced, whereas the effect of confinement was significant for all carbonate sands. No particle crushing effects were observed, due to the low imposed confinements encountered in a hydraulic fill mass." @default.
- W590362209 created "2016-06-24" @default.
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- W590362209 date "2013-12-16" @default.
- W590362209 modified "2023-09-24" @default.
- W590362209 title "Earthquake induced liquefaction susceptibility of Carbonate sands; Experimental study: Cyclic behaviour of Carbonate materials used as hydraulic fills" @default.
- W590362209 hasPublicationYear "2013" @default.
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