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| Influence of control deviation of axial stress on liquefaction characteristics of sand |
| JIANG Yazhou1，LI Yongqiang1，2，WANG Gang1，MA Rong1，JING Liping1 |
| (1. Key Laboratory of Earthquake Engineering and Engineering Vibration，Institute of Engineering Mechanics，China Earthquake Administration，Harbin，Heilongjiang 150080，China；2. School of Civil and Architecture Engineering，East China University of Technology，Nanchang，Jiangxi 330013，China) |
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Abstract Initial stress state has a great influence on the dynamic liquefaction characteristics of saturated sand. Control deviation of stress will lead to large dispersion of liquefaction test results. The influence of control deviation of initial axial stress on liquefaction characteristics of sand is studied experimentally based on the newly developed high-precision DSZ–II static-dynamic unified triaxial test system，supplemented by fine test technology. The control deviation of initial axial stress can lead to the obvious change of liquefaction vibration times in the dynamic liquefaction test under the equal consolidation conditions，which will bring greater uncertainty to the analysis of anti-liquefaction strength of sandy soil. The sand is more likely to liquefy due to stretching under cyclic vibration in the dynamic triaxial test，when the initial axial stress is less than the initial axial stress in the equal consolidation conditions；On the contrary，when the former is larger than the latter，the liquefaction of sand will be more difficult when the deviation is small，but with the increase of deviation stress，the liquefaction will be easier. This conclusion is limited to the case where there is a control deviation of initial axial stress in the equal consolidation，and does not involve the case of large consolidation stress ratio. The dynamic strain can develop rapidly and greatly on both sides of tension and compression under ideal homogeneous conditions，however，the control deviation of initial axial stress will restrict the dynamic deformation amplitude of sandy soil. The deviation has a great influence on the middle development stage of the mean effective stress-deviatoric stress(p'-q) relationship curve，but the p'-q curves of all tests are constrained within the same stress space. This study has reference significance for the accurate determination of anti-liquefaction strength index of sandy soil.
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2020, Vol. 39 
