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在工程实践中,岩基内常有软弱夹层的存在。当进行水工地下结构的有限单元法分析时,应该尽可能加以考虑。本文首先论述了一般的岩体结构特征和力学模型,分析了几种可能的破坏形态。然后着重地讨论了软弱夹层的力学模型及其本构关系。对于岩体夹层的弹塑性矩阵,以及材料受拉破坏和剪切滑移时的应力矩阵、刚度矩阵等计算公式,均作了较系统的导证。最后对编制计算机程序的几个有关问题作了简略的论述,以供编制程序时的参考。
In engineering practice, there is often a weak sandwich within the rock foundation. When performing finite element method analysis of hydraulic underground structures, it should be considered as much as possible. This paper first discusses the general rock structure characteristics and mechanical model, and analyzes several possible failure modes. Then the mechanics model and constitutive relationship of the weak sandwich are discussed. For the elasto-plastic matrix of the rock sandwich, and the stress matrix, stiffness matrix and other calculation formulae for the tensile failure and shear slip of the material, systematic proofs have been made. Finally, a brief discussion of several related issues in the preparation of computer programs is provided for the reference in the preparation of the program.