CYCLIC LABORATORY TESTING-BASED ASSESSMENT OF STRESS SCALING FACTORS FOR CINE SAND

Date

2025-1-08

Author

Al-Suhaily, Ahmed

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In liquefaction triggering assessments, the cyclic stress ratio (CSR) is compared against the cyclic resistance ratio (CRR) to determine whether liquefaction is likely to be triggered. CRR boundary curves are typically expressed for a reference initial vertical effective stress of 100 kPa and zero horizontal shear stress. Therefore, the estimated CRR or CSR values must be corrected to account for deviations from these reference conditions. In this thesis, these 𝐾𝜎 and Kα correction factors were determined through constant volume cyclic direct simple shear (DSS) tests conducted on Çine sand. Çine sand is a poorly graded, clean fine sand with a uniformity coefficient of 3.76. The sand samples were reconstituted at relative density (DR) of 25%, 41%, and 80% using the funnel deposition method. The samples were 𝐾0-consolidated to vertical effective stress (sv) values of 25, 50, 100, 200, and 450 kPa under initial horizontal shear stress ratio (of 0, 0.05, 0.1, 0.2, and 0.30. Subsequently, they were subjected to varying levels of cyclic shear stresses. The number of stress cycles (N) required to induce double amplitude shear strain (𝛾𝐷𝐴) levels of 0.1%, 3%, 5%, 7.5%, 10%, and 15% were estimated for varying CSR, DR, vertical effective stress, and  values. This database was used to develop a series of 𝐾𝜎 and 𝐾𝛼 correction factors within a probability-based framework. The resulting 𝐾𝛼 and 𝐾σ stress normalization factors were found to vi vary with DR and 𝛾𝐷𝐴. These findings were consistent with and comparable to the trends reported in the literature.

Subject Keywords

Çine sand, liquefaction, cyclic direct simple shear, stress corrections, constant volume

URI

https://hdl.handle.net/11511/113499

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Graduate School of Natural and Applied Sciences, Thesis