Experimental studies on effects of initial major stress direction angles on liquefaction characteristics of saturated coral sand

MA Wei-jia; CHEN Guo-xing; QIN You; WU Qi

doi:10.11779/CJGE202003022

Volume 42 Issue 3

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Chinese Journal of Geotechnical Engineering > 2020 > 42(3): 592-600. > DOI: 10.11779/CJGE202003022

MA Wei-jia, CHEN Guo-xing, QIN You, WU Qi. Experimental studies on effects of initial major stress direction angles on liquefaction characteristics of saturated coral sand[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(3): 592-600. DOI: 10.11779/CJGE202003022

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Experimental studies on effects of initial major stress direction angles on liquefaction characteristics of saturated coral sand

MA Wei-jia^1,,
CHEN Guo-xing^{1, 2, ,},
QIN You¹,
WU Qi¹

1.
Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China
2.
Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing 210009, China

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Received Date: March 24, 2019
Available Online: December 07, 2022

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Abstract

Abstract

In order to investigate the liquefaction characteristics of saturated coral sand from Nansha Islands under different initial major stress direction angles (α₀), a series of undrained cyclic torsional shear tests for saturated coral sand are carried out by using the GDS hollow cylinder torsional apparatus. A remarkable finding of this study is that, α₀ has significant influence on the liquefaction characteristics of coral sand, the excess pore water pressure (u_e) for case α₀ ≠ 45° cannot reach the initial mean principal stress ${p^{'}}_{0}$ , but the u_e for case α₀ = 45° can eventually reach do. The developments of strain components for various α₀ cases are different, but the specimens for all α₀ cases will produce larger general shear strain amplitude (γ_ga), and the correlation between the u_e to ${p^{'}}_{0}$ and γ_ga can be expressed approximately as tangent function. Based on the experimental data, the number of cycles (N_L) required to induce initial liquefaction decreases with the increasing α₀ for a given cyclic stress ratio (CSR). However, by defining the modified cyclic stress ratio (CSR_M) as a new index for cyclic stress level, a virtually unique relationship between CSR_M and N_L can be established for all α₀ cases. The applicability of CSR_M is verified by the original test data of saturated sands from the literatures.

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