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Finite element analyses of slope stability problems using non-associated plasticity

Journal of Rock Mechanics and Geotechnical Engineering 2018年第6期10卷 1091-1101页

作者： Simon Oberhollenzer franz tschuchnigg Helmut F.Schweiger Institute of Soil Mechanics Foundation Engineering and Computational Geotechnics Graz University of Technology

In recent years, finite element analyses have increasingly been utilized for slope stability problems. In comparison to limit equilibrium methods, numerical analyses do not require any definition of the failure mechanism a priori and enable the determination of the safety level more accurately. The paper compares the performances of strength reduction finite element analysis(SRFEA) with finite element limit analysis(FELA), whereby the focus is related to non-associated plasticity. Displacement-based finite element analyses using a strength reduction technique suffer from numerical instabilities when using non-associated plasticity, especially when dealing with high friction angles but moderate dilatancy angles. The FELA on the other hand provides rigorous upper and lower bounds of the factor of safety(FoS) but is restricted to associated flow rules. Suggestions to overcome this problem, proposed by Davis(1968), lead to conservative FoSs; therefore, an enhanced procedure has been investigated. When using the modified approach, both the SRFEA and the FELA provide very similar results. Further studies highlight the advantages of using an adaptive mesh refinement to determine FoSs. Additionally, it is shown that the initial stress field does not affect the FoS when using a Mohr-Coulomb failure criterion.

关键词： Finite element limit analysis(FELA) Finite element method Slope stability Strength reduction technique Non-associated plasticity Adaptive mesh refinement Initial stresses

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长期类脂质渐进性坏死皮损区鳞状细胞癌发病率的增加

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世界核心医学期刊文摘（皮肤病学分册） 2006年第11期2卷 20-20页

作者： Lim C. tschuchnigg M. Lim J. 任建文 Davies Campbell de Lambert 2 Leeds Street Rhodes NSW 2138 Australia

Background: Squamous cell carcinoma in an area of chronic ulceration is a well-documented phenomenon. However, its occurrence arising de novo in an area of necrobiosis lipoidica is rare. Method: We report a case in a 53-year-old female who presented with a 2 month history of an erythematous nodule occurring in a plaque of necrobiosis lipoidica on the medical aspect of the right lower leg. She had a background of poorly controlled Type 1 diabetes. Results: Histopathological findings revealed a well-differentiated squamous cell carcinoma overlying an area of necrobiosis lipoidica. Treatment was by excision and split-thickness skin graft. Conclusion: Clinicians should be aware of malignant transformation within a plaque of necrobiosis lipoidica. Early detection will allow conservative treatment.

关键词：皮损区鳞状细胞癌右小腿早期检查慢性溃疡组织病理学临床医师

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