非共轴次加载面模型及其对地基承载特性的模拟

doi:10.13722/j.cnki.jrme.2020.1061

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摘要针对传统弹塑性模型在模拟地基承载力时无法考虑土体非共轴塑性变形的问题，通过将改进的非共轴理论引入次加载面模型建立一个新的非共轴塑性模型，并通过用户材料子程序接口将模型嵌入ABAQUS软件中。然后，利用该模型对不同超固结度情况下的黏土地基承载特性进行模拟预测。研究结果表明：考虑非共轴塑性时，预测的最大沉降量随着非共轴塑性模量的减小而增大；非共轴塑性模量对模拟结果的影响程度与地基土的超固结度有关。此外，当非共轴塑性模量减小为土体剪切模量时，预测的最大沉降量会受到较为显著的影响。因此，当实际的非共轴塑性模量小于剪切模量时，在地基工程中应考虑非共轴塑性变形的影响以保证安全性。

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	孔亮1
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	王兴2
	李学丰3

关键词 ：基础工程, 改进非共轴理论, 次加载面模型, 地基承载特性

Abstract：The traditional elasto-plastic models cannot consider the non-coaxial plastic deformation of soils when simulating the bearing capacity of foundations. In this paper，a non-coaxial plastic model was established by introducing the modified non-coaxial theory into the sub-loading surface model，and the model was embedded into ABAQUS software through the user material subroutine interface. Then，the model was used to predict the bearing characteristics of clay foundations with different degrees of over-consolidation. The results show that，when the non-coaxial plasticity is considered，the predicted maximum settlement increases with decreasing the non-coaxial plastic modulus，and that the influence of the non-coaxial plastic modulus on the simulation results is related to the over-consolidation degree of foundation soils. In addition，decreasing the non-coaxial plastic modulus to the shear modulus will have a relatively significant effect on the predicted maximum settlement. Therefore，when the actual non-coaxial plastic modulus is less than the shear modulus，the influence of the non-coaxial plastic deformation should be carefully considered in foundation engineering to ensure safety.

Key words： foundation engineering modified non-coaxial theory sub-loading surface model bearing characteristics of foundation

引用本文:

孔亮1，2，王兴2，李学丰3. 非共轴次加载面模型及其对地基承载特性的模拟[J]. 岩石力学与工程学报, 2021, 40(12): 2535-2544.
KONG Liang1，2，WANG Xing2，LI Xuefeng3. Non coaxial sub-loading surface model and its application in numerical simulation of foundation bearing characteristics. , 2021, 40(12): 2535-2544.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.1061 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I12/2535

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