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合理的颗粒接触摩擦模型是从微观角度研究各类结构面强度的基础,然而受制于岩土体颗粒在微观高应力环境中表现出的复杂接触特征,该问题一直未能很好解决。Fujimoto在2000年给出了受切向荷载作用的微凸体在理想弹性或完全塑性接触状态下的微观位移特性,但却缺少对塑性强化接触状态下的摩擦进行解析,难被用于分析微观高应力状态下岩土颗粒的接触摩擦。为此,以Fujimoto模型为基础,结合作者曾经提出的塑性强化接触变形理论,在构建塑性强化接触状态下颗粒微观位移模型的基础上,系统的研究了切向荷载作用下塑性强化材料颗粒的接触摩擦机理,阐明了不同接触状态下塑性强化材料颗粒的切向微观位移特征。最后通过算例分析显示了模型的合理性。结果表明:颗粒摩擦本质上是不同法向荷载不同接触状态区域按照不同摩擦类型提供摩擦的综合,而摩擦失稳就是接触面上微滑区扩大、粘着区缩小并消失的过程。
The reasonable particle contact friction model is the basis for the study of the strength of various types of structural planes from the microscopic point of view. However, due to the complex contact characteristics of the particles of the rock and soil in the microscopic high stress environment, this problem has not been solved well. In 2000, Fujimoto gave the micro-displacement characteristics of a tangential load asperities under ideal or complete plastic contact but lacked the ability to analyze the friction under plastic-enhanced contact and was difficult to analyze for microscopic Contact Friction of Rock and Soil Particles in High Stress State. Therefore, based on the Fujimoto model, combined with the plasticity-enhanced contact deformation theory that the author once proposed, based on the model of microscopic particle movement under the condition of plastic strengthening contact, the contact of the plasticized material particles under tangential loading Friction mechanism, clarify the tactile micro-displacement characteristics of plastic reinforced material particles under different contact conditions. Finally, a case study shows the rationality of the model. The results show that the particle friction is essentially a combination of friction in different contact states at different normal loads. Frictional instability is the process of increasing the micro-slip area on the contact surface and reducing and disappearing the adhesion area.