The effects of initial static shear stress on the liquefaction resistance of Çine sand

Date

2024-7

Author

Söylemez, Berkan

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The effects of initial static shear stress on the liquefaction behavior of saturated Çine sand were evaluated through hollow cylinder cyclic torsional tests. The relative density and the initial static and cyclic shear stresses were considered as the variables of the cyclic testing program. The variation of excess pore water pressure and shear strain were monitored throughout the applied shear cycles, allowing for a comprehensive understanding of the impact of these variables on liquefaction resistance. Soil liquefaction triggering was identified with the onset of 10 % double amplitude cyclic shear strains level. The cyclic resistance ratio (CRR) vs. equivalent number of shear stress cycles (N) curves were developed for the samples tested under zero and nonzero initial shear stresses. The effects of initial static shear stresses were assessed by simply taking the ratio of CRR values from these two sets of tests. This ratio is defined as slope correction factor, 𝐾𝛼. It is concluded that the presence of initial static shear stresses increases CRR values for dense soil specimens whereas decreases it for the loose ones, consistent with the recommendations of NCEER (1997).

Subject Keywords

Çine sand, Liquefaction, Cyclic torsion, Slope correction factor

URI

https://hdl.handle.net/11511/111006

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Graduate School of Natural and Applied Sciences, Thesis