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地下岩体工程建设和运营过程中,需要考虑节理岩体的水力学性质,这与节理的闭合变形密切相关。对法向应力作用下节理微凸体的变形特征进行详细分析,逐个计算接触微凸体的法向变形和接触应力;采用接触理论计算微凸体基圆半径之外的基体变形,并以此调整微凸体的法向位置,进而提出新的闭合变形理论模型。新模型可反映节理的基体变形和微凸体变形相互作用的影响,也能体现形貌分量和接触类型对闭合变形的影响。与已有的理论模型比较,新模型的计算值更为接近试验值。采用叠加原理,新模型计算得到的初始法向刚度最小;但随法向应力的增加,法向刚度增加速率逐步加快。
In the process of underground rock mass construction and operation, the hydraulic properties of the jointed rock mass need to be considered, which is closely related to the closed deformation of the joint. The deformation characteristics of asperities under normal stress are analyzed in detail. The normal deformation and contact stress of contact asperities are calculated one by one. The contact deformation is calculated by the contact theory, Adjust the normal position of asperities, and then put forward a new theoretical model of the closed deformation. The new model can reflect the influence of the deformation of the joint and the deformation interaction of the asperities, as well as the influence of the morphology component and the contact type on the closure deformation. Compared with the existing theoretical model, the calculated value of the new model is closer to the experimental value. Adopting the principle of superposition, the initial normal stiffness calculated by the new model is the smallest. However, with the increase of normal stress, the increasing rate of normal stiffness accelerates gradually.