| 平面应变状态下边坡安全系数的近似求解 |
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| 引用本文： | 杨雪强,Ling Pingping,陈桂林.平面应变状态下边坡安全系数的近似求解[J].岩土工程技术,2008,22(4):173-177. |
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| 作者姓名： | 杨雪强 Ling Pingping 陈桂林 |
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| 作者单位： | 1. 广东工业大学建设学院,广东广州,510006
2. 福州市城市建设发展总公司,福建福州,350011 |
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| 摘 要： | Mohr—Coulomb屈服准则不考虑中间主应力对材料强度的贡献，是一个保守的强度屈服准则，在近似平面应变状态下，匹配于Mohr-Coulomb屈服准则的Drucker-Prager屈服准则能给出边坡安全系数偏保守一些的估计；相对而言，Matsuoka—Nakai和Lade-Duncan屈服准则均考虑了中间主应力对土体强度的影响，在近似平面应变状态下，匹配于Matsuoka-Nakai和Lade-Duncan屈服准则的Drucker-Prager屈服准则能给出岩土类材料较为合理的破坏强度预测，土体的抗剪强度能被更有效地发挥出来，因而借助这些转化的Drucker-Prager屈服准则能给出平面应变状态下土坡安全系数较为合理和真实的预测。文中的边坡稳定算例证实了这些观点。
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| 关 键 词： | 屈服准则 强度折减有限元法 平面应变 安全系数 |
Approximate Solution to Safety Factor of Slope Stability Under Plane Strain Condition |
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| Yang Xueqiang,Ling Pingping,Chen Guilin.Approximate Solution to Safety Factor of Slope Stability Under Plane Strain Condition[J].Geotechnical Engineering Technique,2008,22(4):173-177. |
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| Authors: | Yang Xueqiang Ling Pingping Chen Guilin |
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| Institution: | Yang Xueqiang Ling Pingping Chen Guilin (1. Guangdong University of Technology, Guangzhou Guangdong 510006; 2. Branch of Huazhong University of Science and Technology,Wuhan Hubei 430068; 3. Fuzhou General Development Company of City Construction, Fuzhou Fujian 350011 China) |
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| Abstract: | Mohr-Coulomb yield criterion, which does not consider the contribution of intermediate principal stress to soil strength,is a conservative yield criterion, thus Drucker-Prager yield criteria transformed from the Mohr-Coulomb yield criterion under approximate plane strain condition, will give conservative estimation of safety factor for plane strain slope stability analyses. Relatively, Matsuoka-Nakai and Lade-Duncan yield criteria both consider the influence of the intermediate principal stress on soil strength effectively, thus Drucker-Prager yield criteria transformde from the Matsuoka-Nakai and Lade-Duncan yield criteria under approximate plane strain conditions, could give a reasonable failure strength predictions for geo-materials, soil shear strength could be exerted more sufficiently under plane strain status, and therefore more reasonable and real safety factors could be exerted more sufficiently under plane strain status, and therefore more reasonable and real safety factors could be obtained by using the transformed Drucker-Prager yield criteria for slope stability analyses. Calculation results of planme strain slope stability given by using ANSYS prove above views. |
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| Keywords: | yield criterion strength reduction finite element method plane stain safety factor |
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