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分析了岩石在平面应变条件下的弹塑性本构模型，在此基础上采用分叉理论对岩石在平面应变条件下变形局部化及剪切带的形成和方向进行了分叉分析，得出了剪切带产生的条件以及剪切带倾角的表达式．研究表明，所得的理论结果与试验结果相吻合．
The elastic-plastic constitutive model of rock under plane strain condition is analyzed. Based on the bifurcation theory, the bifurcation analysis is made on the deformation localization and the formation and direction of the rock under the plane strain condition. The conditions under which the shear band is generated and the expression of the inclination of the shear band. The research shows that the theoretical results obtained are consistent with the experimental results.