岩体三维非线性力学问题的弹塑性力学模型

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。

The Three Dimensional Nonlinear Elasto-Plastic Mechanical Models of Rock Mass

In the three dimensional analysis of rock mass with FEM, in order to consider the nonlinear meshanical behavior of rock block （including joints and cracks） and the weak fabrics （faults,weak intercalations） in rock mass, assuming the rock mass to be an elasto-plastic body approximately, two general mechanical models for the rock block and the weak fabrics in rock mass are suggested respectively. And in the light of the non-associated flow rule in plasticity, constitutive equations corresponding to the suggested models are developed.