三轴试样端部约束影响有限元分析
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TU41

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长江水科学研究联合基金重点支持项目(U2040221);国家自然科学基金雅砻江联合基金资助项目(U1865104)


Finite Element Analysis of the Effect of End Restraint on Triaxial Specimen
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    摘要:

    对某压实黏土和软土分别开展两种端部约束条件下的中三轴三维有限元模拟,对应端部约束条件分别为完全限制端部径向位移和径向自由(端部无约束,无摩擦力)。对比分析两种端部约束条件下试样强度和应力应变结果,定量研究了试样端部约束对两种土料强度和应力应变特性的影响。结果表明,端部约束对土体强度有一定提高,但不会改变轴向偏应力和轴向应变关系曲线的整体趋势;随着围压的增大,端部约束对强度和应力应变的影响有所降低,但降低幅度有限;三轴试验中,和试样端部径向自由相比,端部因摩擦力引起的约束会显著增大试样的体积应变,而且土体的软硬程度对试样的体变影响较大。对压实黏土,端部约束试样剪切破坏时平均体变εv比径向自由增大17.2%;对软土该值的影响也达到了5.2%。

    Abstract:

    Three-dimensional finite element simulations of medium triaxial consolidation and drainage shear tests were carried out for a compacted clay and a soft soil under two end restraint conditions, corresponding to fully restricted end radial displacement and radial unconstrained (no end restraint and no friction), respectively. The strength and stress-strain results of specimens under different conditions were compared and analyzed to quantify the effects of end restraint conditions on the strength and stress-strain properties of the two soil materials. The results showed that the end restraint increased the strength of the soil but did not change the overall trend of the relationship curve between the axial deviatoric stress and axial strain, and that the effects of end restraints on the strength and stress-strain show a limited decrease with the increase of the surrounding pressure. In the triaxial test, compared with the radial unconstrained condition, the restraint caused by friction at the end of the specimen significantly increased the volume strain and the degree of softness of the soil had a larger influence on the bulk strain of the test. The average volume strain εv at the shear failure of end confined specimens increased by 17.2% for compacted clay soil and increased by 5.2% for soft soil compared to the radial unconstrained condition, respectively.

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蒯青青,高峰,褚福永,孙鹏飞,朱俊高.三轴试样端部约束影响有限元分析[J].河北工程大学自然版,2022,(3):43-48

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  • 收稿日期:2022-02-27
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  • 在线发布日期: 2022-10-25
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