对岩土工程有限元强度折减法的几点思考

Discussion on strength reduction FEM in geotechnical engineering

有限元强度折减法是岩土工程极限分析有限元法中研究和应用较多的一种。近年来获得了快速发展,且成果丰硕,初步显示出在岩土工程中的可行性、优越性和实用性。在充分肯定其优势及特点的同时,从安全系数定义、摩尔-库仑准则的应用条件、计算参数选取等方面,探讨了有限元强度折减法的若干问题。认为应注意该方法的使用条件和计算参数选取;研究以变形控制设计为主的岩土结构安全系数及稳定性,与传统极限平衡方法结合互补,研发多种方法和用途的专业计算软件是较好的发展方向。

The strength reduction FEM （SRFEM） is the most popular method in geotechnical limit analysis FEM. It has been studied and applied in recent years quickly; and significant achievements have been obtained and its feasibility, superiority and practicability in geotechnical engineering have been proved. Several problems about SRFEM are discussed such as the definition of safety factor, utility condition of Mohr-Coulomb criterion and access to calculation parameters after the adequate praise and affirmation of its advantage and characteristics. It is concluded that the application conditions and access to calculation parameters of SRFEM should be carefully considered; the further and probable research might be turned to the safety and stability analysis of geotechnical structure with the emphasis on deformation control; and the development of professional calculation software of multiple methods and functions with the combination ＆ complementation of traditional limit equilibrium method.