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在对岩体结构进行三维有限元分析时,为了反映岩块(包括节理裂隙)和软弱结构面(断层、软弱夹层)的非线性力学性质,本文近似地将岩体视为弹塑性体,在综合了前人弹塑性增量理论研究工作和试验资料的基础上,分别对岩块和软弱结构面提出了带有普遍性的力学模型。并根据塑性力学的“非关联”流动法则推导了相应于该力学模型的本构关系。可供编制三维弹塑性力学问题有限元法计算程序之用。
In the three-dimensional finite element analysis of rock mass structure, in order to reflect the nonlinear mechanical properties of rock masses (including joint fractures) and weak structural faces (faults, weak sandwiches), this paper approximates the rock mass as an elastoplastic body. Based on previous studies of elasticity-plasticity incremental theory and experimental data, a generalized mechanical model was proposed for the rock mass and the weak structural plane. Based on the “non-associated” flow rule of plastic mechanics, the constitutive relationship corresponding to the mechanical model is deduced. Available for programming three-dimensional elastic-plastic mechanical problems with the finite element method of calculation procedures.