轴向应力控制偏差对砂土液化特性影响研究

doi:10.13722/j.cnki.jrme.2019.0877

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摘要初始应力状态对饱和砂土动力液化特性有较大影响，应力控制偏差会导致液化试验结果出现较大离散。基于最新研制的高精度DSZ–II型静–动统一三轴试验系统，辅之以精细试验技术，试验并分析初始轴向应力控制偏差对砂土液化特性的影响规律。初始轴向应力控制偏差会导致均等固结的液化振次发生明显变化，给砂土抗液化强度分析带来较大不确定性。初始轴向应力小于理想均等固结的初始轴向应力时，砂土在动力作用下更容易因拉伸而液化；而前者大于后者时，砂土在小控制偏差应力情况下的液化难度增加，但随着偏差应力增大，液化又变得较易发生。该结论仅限于均等固结轴向应力控制存在偏差的情况下，不涉及大固结应力比的情况。理想均等固结条件下，动应变在拉压两侧均能快速较大发展，初始轴向应力控制偏差会使得砂土动力变形幅度受到约束。轴向应力控制偏差对平均有效应力–偏应力(p'-q)关系曲线的中间发展阶段影响较大，但全部试验的p'-q关系曲线均被约束在相同的应力空间范围内。本研究对准确测定砂土抗液化强度指标具有参考意义。

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	江亚洲1
	李永强1
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	汪刚1
	马荣1
	景立平1

关键词 ：土力学, 轴向应力, 控制偏差, 应力路径, 液化振次

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.

Key words： sand liquefaction axial stress control deviation stress path liquefaction vibration times

引用本文:

江亚洲1，李永强1，2，汪刚1，马荣1，景立平1. 轴向应力控制偏差对砂土液化特性影响研究[J]. 岩石力学与工程学报, 2020, 39(S1): 3023-3031.
JIANG Yazhou1，LI Yongqiang1，2，WANG Gang1，MA Rong1，JING Liping1. Influence of control deviation of axial stress on liquefaction characteristics of sand. , 2020, 39(S1): 3023-3031.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0877 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/IS1/3023

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