According to anisotropic mechanical properties of columnar joints rock mass in Baihetan and bending effects of joint sections,Cosserat constitutive relation of a group intermittent joints of regular rock mass can be obtained by Cosserat theory and the hypothesis of material's continuity and uniformity.Based on structural characteristics of regular hexagonal prisms,columnar joints plane's constitutive relation of rock mass is also derived by regarding the plane as the composite of three groups of intermittent joints.Finally,the correctness of the model is proved by Baihetan engineering example.%针对白鹤滩柱状节理岩体的各向异性力学特性,考虑节理部分引起的弯曲效应,采用Cosserat理论和材料连续均匀假设,得到规则岩体一组断续节理的Cosserat本构关系,然后根据规则六棱柱形岩体结构特点,视平面为三组断续节理的复合,得到柱状节理岩体平面本构关系,最后针对白鹤滩工程实例,验证本文模型的正确性.
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