A finite element implementation of strain-softening rock mass

详细信息    查看全文

• 作者：Shuilin Wang ; ^a ; ^{slwang@whrsm.ac.cn} ; Hong Zheng^a ; Chunguang Li^a ; Xiurun Ge^a
• 关键词：Strain-softening ; Finite element analysis ; Brittle-plasticity ; Rock mass
• 刊名：International Journal of Rock Mechanics and Mining Sciences
• 出版年：2011
• 出版时间：January 2011
• 年：2011
• 卷：48
• 期：1
• 页码：67-76
• 全文大小：2026 K

文摘

Many types of rock masses behave in a strain-softening way in geotechnical engineering. Numerical methods have to be used to study these kinds of media. But a limit to the rate of softening of the strain-softening material exists within the framework of the classical theory of plasticity. Considering the salient characteristic that the strength parameters decrease during the process of strain-softening, this paper develops a procedure for modeling strain-softening behavior based on the methodology for analyzing brittle-plastic rock mass. In the proposed procedure, strain-softening process is simplified as a series of stress drops and plastic flow. Therefore, solving a strain-softening problem becomes finding a series of brittle-plastic solutions. The proposed procedure is implemented in a finite element code based on the classical theory of plasticity in which Mohr–Coulomb (M–C) criterion is employed. Numerical examples are examined and the results validate the proposed implementation.