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本文选用广义开尔文体和滨汉姆体相串联的粘塑性力学模型,描述了开挖围岩的瞬变和蠕变应变。基于该模型推导了针对各种屈服准则的粘塑性应变增量的隐式统一式,并编制了三维有限元程序。同时,用参数变换法实现了三维有限元网格划分的计算机化,结合工程实例系统地实现了对岩体工程开挖围岩力学特性的空间模拟,分期开挖及围岩蠕变的计算分析,计算程序可供设计和工程问题研究中参考。
In this paper, a visco-plastic mechanical model with generalized Kelvin body and Bingham body series is selected to describe the transient and creep strains of excavated surrounding rock. Based on this model, the implicit unity of visco-plastic strain increments for various yield criteria was deduced, and a three-dimensional finite element program was developed. At the same time, the computerized three-dimensional finite element meshing is realized by the parameter transformation method, and the spatial simulation of the mechanical properties of the rock mass excavation surrounding rock is realized systematically in combination with engineering examples. The calculation and analysis of the excavation by phases and the creep of the surrounding rock are performed. The calculation program can be used for reference in the design and research of engineering problems.