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法向应力作用下节理的闭合变形是工程实践中常见但又未被很好解决的节理力学性质之一。依据弹性接触理论,提出考虑微凸体变形相互作用影响的闭合变形理论模型,该相互作用由一个均布荷载体现。模型采用不同接触下节理的组合形貌参数,适用于含起伏度分量的节理的闭合变形问题。较之于不考虑微凸体变形相互作用影响的Xia模型,新模型的计算值更为接近试验值。
The closed deformation of joints under normal stress is one of the mechanical properties of joints that is common but not well solved in engineering practice. According to the theory of elastic contact, a theoretical model of closed deformation considering the interaction of asperities is proposed, which is represented by a uniform load. The model uses the combined topography parameters of the joints under different contact conditions and is suitable for the closed deformation of joints with undulations. The calculated value of the new model is closer to the experimental value than that of the Xia model, which does not consider the effect of the deformation of asperities.