原状黄土的剪应变速率效应及数值模拟
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TU432

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Study on Shear Strain Rate Effect and Numerical Simulation of Undisturbed Loess
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    为探究不同剪应变速率下非饱和原状黄土的变形性状与强度特性,利用南京土壤仪器SLB-1型三轴剪切渗透试验仪器,通过不同围压、不同剪应变速率条件下的室内三轴UU试验,对非饱和原状黄土在不同初始应力状态的剪应变速率效应进行分析,并结合PLAXIS 3D数值模拟研究,以期为数值模拟室内试验提供参考从而节约时间和成本。研究结果表明:非饱和原状黄土偏应力随应变的增加前期迅速增加,随后增加缓慢,呈现出应变硬化型,硬化程度随围压的增大而增大,模拟结果的硬化程度小于试验结果的硬化程度。试验范围内,原状黄土偏应力-应变曲线随着剪应变速率的增加不断上移,破坏强度随剪应变速率的增加而增大,模拟结果中剪应变速率对破坏强度的影响范围小于试验结果。

    Abstract:

    In order to study the deformation and strength characteristics of unsaturated undisturbed loess under different shear strain rates, the laboratory triaxial UU test under different confining pressures and shear strain rates is carried out by using the SLB-1 triaxial shear penetration test instrument of Nanjing Soil Instrument, which tests the shear strain rate effect of unsaturated undisturbed loess under different initial stress states. Then the experimental results are compared with the results of PLAXIS 3D numerical simulation, which can provide a reference for numerical simulation of laboratory experiments so as to save time and cost. The results show that the deviational stress of unsaturated undisturbed loess increases rapidly with the increase of strain at the early stage, and then increases slowly, which is strain hardening type and the degree of hardening increases with the increase of confining pressure. The results also show that the deviatoric stress-strain curve of undisturbed loess moves upward with the increase of shear strain rate, the destructive strength also increases with it. And the influence range of shear strain rate on destructive strength obtained by numerical simulation is smaller than that obtained by laboratory test.

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文少杰,张吾渝,童国庆,等. 原状黄土的剪应变速率效应及数值模拟[J]. 科学技术与工程, 2020, 20(15): 6205-6210.
Wen Shaojie, Zhang Wuyu, Tong Guoqing, et al. Study on Shear Strain Rate Effect and Numerical Simulation of Undisturbed Loess[J]. Science Technology and Engineering,2020,20(15):6205-6210.

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历史
  • 收稿日期:2019-08-22
  • 最后修改日期:2020-06-15
  • 录用日期:2019-11-11
  • 在线发布日期: 2020-06-24
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