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以岩石非线性统一强度理论为基础,考虑了岩体的非线性软化及非关联流动特性,建立了岩体在非线性模型、理想弹塑性模型和强脆性模型下统一的极限平衡分析模式,获得了硐室的应力、变形及塑性区半径的解,这些解不但反映了硐室围岩塑性软化和剪胀特性,而且又考虑了岩石拉压强度相差较大的特点和中间主应力效应,既反映了岩石的非线性破坏特征,又可以推广到岩体及节理岩体之中去。而且,通过比较三类典型塑性模型的解答,发现当岩石软化特性不是太明显的情况下,采用理想弹塑性模型进行地下硐室的极限平衡分析是可行的,以上结论对于岩石地下硐室工程具有一定的理论及工程应用价值。
Based on the nonlinear unified strength theory of rock, considering the nonlinear softening and non-associated flow characteristics of rock mass, a unified limit equilibrium analysis model of rock mass under nonlinear model, ideal elastic-plastic model and strong brittleness model is established. These solutions not only reflect the plastic softening and dilatancy characteristics of the surrounding rock of the cavern, but also take into account the large difference between the rock tensile strength and the main intermediate stress effect, which not only reflects the stress and deformation of the chamber and the plastic zone radius, It reflects the nonlinear failure characteristics of rock and can be extended to rock mass and jointed rock mass. Moreover, by comparing the solutions of three typical plastic models, we find that it is feasible to use the ideal elastic-plastic model to analyze the equilibrium of underground chambers when the rock softening property is not too obvious. These conclusions are valid for the underground chamber project of rock Certain theoretical and engineering value.