锚固正交各向异性岩体的三维粘弹-粘塑性有限元分析

3D VISCOELASTIC-VISCOPLASTIC FEM ANALYSIS FOR BOLTED ORTHOTROPIC ROCKMASS

首先,从经过系统锚杆加固的正交各向异性岩体中取出表征单元,然后,根据“等效材料”的概念,在一定的简化条件下,建立其本构方程、破坏准则及粘弹-粘塑性模型并将其引入三维有限元程序中。以地下洞室开挖为算例来考察锚固前后围岩的流变动态,从而得出有益的认识和结论。

First of all, a representative element is taken theoretically from the orthotropic rock reinforced by systematic rock bolts, then according to the concept of equivalent material and under some simplified conditions, the relevant constitutive expression and the failure criterion as well as one kind of viscoelastic-viscoplastic model for the bolted rock are set up and a 3D FEM code is introduced. Through the calculation examples of an underground opening the rheological states of the surrounding rock without and with bolting are investigated, and some conclusions are given finally.