摘要
围岩的应力分布影响地下硐室的稳定。基于各向异性损伤理论研制了相应的轴对称有限元程序,分析了厚壁圆筒在外压作用下的应力分布。围岩的切向应力梯度随着材料脆性指数的增加而增大,厚壁圆筒临近整体破坏时,最大切向应力位于距筒壁内表面一定深度处。研究结果较好地解释了岩爆剥落岩片存在一定厚度这一现象的力学机制。
The stress distribution of surrounding rocks is of great influence on stability of tunnels. Based on anisotropic damage theory, an axisymmetric FEM program was developed to study stress distribution of a thick cylinder under outside compression. Gradient of tangential stress increases along with the increase of brittle index of rocks, and the maximal tangential stress occures at some distance from the inner surface of the cylinder. The mechanism of the phenomenon is explained that the slices are exfoliated from surrounding rocks with different thickness
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2003年第5期838-842,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
国家"九五"科技攻关项目(96-116-01-01-02)
