| 许梦飞,姜谙男.Mohr-Coulomb准则主应力回映算法及在地基问题的应用[J].计算力学学报,2020,37(1):83~91 |
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| Mohr-Coulomb准则主应力回映算法及在地基问题的应用 |
| Stress return mapping algorithm of Mohr-Coulomb criterion in principal stress space and its application in the problems of geotechnical foundation |
| 投稿时间：2018-11-12 修订日期：2019-02-20 |
| DOI：10.7511/jslx20181112001 |
| 中文关键词: Mohr-Coulomb准则 主应力空间 应力回映算法 弹塑性有限元 岩土地基问题 |
| 英文关键词:Mohr-Coulomb criterion principal stress space stress mapping algorithm elastoplastic FEM geotechnical foundation |
| 基金项目:国家自然科学基金（51678101）资助项目. |
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| 中文摘要: |
| 针对Mohr-Coulomb准则在应力空间中存在奇异点的问题，提出了主应力空间应力回映算法。分析了多屈服面下塑性流动法则，给出了应力更新过程中应力回映区域的判定方法，推导了不同映射区域下塑性因子的Newton-Raphson迭代求解式和应力更新方程，建立了对应的一致切线模量表达式。利用C++语言，编制了弹塑性有限元求解程序，并对岩土地基问题进行求解，计算结果的比对证明了所编程序的可行性和精确性。 |
| 英文摘要: |
| The stress mapping algorithm in principal stress space of Mohr-Coulomb criterion is introduced to deal with its divergence problem at singular points.The multisurface plastic flow rule is analysed.The judgment method for mapping area is put forward during stress updating process.The Newton-Raphson iterative equation for the plastic factor and the stress updating equation are derived.The expression of the consistent tangent operator is established.The elastoplastic FEM program is coded using C++ language which is used to solve the problems of geotechnical foundation.The results demonstrate the feasibility and precision of the program. |
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