United States Department of Transportation
i
Post-cyclic behavior of low plasticity silt under full and limited liquefaction using triaxial compression testing.
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2010-02-01
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Abstract:During an earthquake, liquefaction does not happen all the time. It depends on the duration and magnitude of the earthquake and the properties (with relationship to resistance of liquefaction) of the low plasticity silt. Under low duration or magnitude of earthquake, the liquefaction does not appear in the ground. However, the properties of soil in the ground will be affected. Typically, its shear strength and stiffness will be reduced. The effect of limited cycle of dynamic loading on soil behavior is called limited liquefaction in the proposal. The post‐cyclic behavior of the low plasticity silt under different levels of limited liquefaction will be studied. Additionally, the effect of plasticity index (PI) on the post‐cyclic behavior of the silt under (full) liquefaction will also be investigated. Hopefully, a threshold value can be obtained, above or below which the reduction of shear strength and stiffness will be little and even can be ignored. The studied low plasticity silt will be from the Mississippi River Valley in the New Madrid Seismic Zone (NMSZ), which is one of the most seismically susceptible areas in the United States. All work will be conducted using laboratory testing. The work in this research project includes three parts: the post‐liquefaction behavior at the different levels of reconsolidation; the post‐cyclic behavior under no reconsolidation at the different levels of limited liquefaction; and the effect of the PI on post‐liquefaction behavior.
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