双剪统一边界面塑性本构模型的有限差分算法及其数值验证

doi:10.13722/j.cnki.jrme.2022.0124

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Abstract The twin shear unified bounding surface plasticity model(BUST model) can capture the plastic strain accumulation of geomaterials in small deviatoric stress state，which can?t be well predicted by classical twin shear unified elastoplastic constitutive model(UST model). To apply the BUST model in analyzing static and dynamic response of slopes or landslides，its finite difference format is formulated and compiled，and its reliability is further analyzed using numerical simulation. Firstly，the finite difference format of the BUST model is formulated both in general stress space and principal stress space. Specifically，the mathematical form of bounding surface，loading surface，mapping rule variable，plastic multiplier，plastic correction，and corner singularity treatment are derived. Secondly，the finite difference format of BUST model is compiled using C++ language，and its dynamic link library file is generated. Finally，a list of numerical simulation is conducted using FLAC3D software including a unit test for comparing BUST model and UST model，a triaxial compression test for predicting the stress-strain relationship of soft rock，a loess-mudstone slope simulation for predicting acceleration response. The results indicate that the finite difference method of the BUST model is reliable，and it can be applied in analyzing static and dynamic response of slopes or landslides.

Key words： slope engineering unified strength theory bounding surface plasticity constitutive model FLAC3D numerical simulation

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	Articles by authors
	KANG Xiaosen1
	LIAO Hongjian2
	HUANG Qiangbing1
	WANG Zuochen1
	MA Zongyuan3

Cite this article:

KANG Xiaosen1,LIAO Hongjian2,HUANG Qiangbing1, et al. Finite difference method of a twin shear unified bounding surface plasticity model and its numerical validation[J]. , 2023, 42(1): 65-75.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0124 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I1/65

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