裂缝三级摩擦因数及影响因素研究(以砂岩(颗粒胶结体)为例)

Three Levels Friction Coefficients of Cracks and Their Influencing Factors—Taking the Sandstone (Particle Packing Layers) as an Example

讨论摩擦面的摩擦因数模型.认为砂岩的摩擦因数分为砂粒球面摩擦因数、微裂纹平面摩擦因数、凸凹构成的裂缝摩擦因数3个层次,分别代表3类不同的成因,3个层次的耦合是真实岩石摩擦因数的决定因素.岩石摩擦因数是在砂粒球面材料摩擦因数基础上,经过后两种形式的放大而形成岩石的宏观摩擦因数.裂纹表面凸起的平均角度或者分形维数是影响岩石摩擦因数分异的最大影响因素,而颗粒排布模式导致的分异相对小得多.颗粒接触的静摩擦因数大于动摩擦因数的成因与颗粒的平均接触角度有关.

To build a friction factors model of friction surface and dividing the friction factors into three levels,there were respectively the friction coefficients of surfaces of sand particles,average friction coefficient of asperities inclined plane,rocks surfaces（or macroscopic crack）.The coupling of three levels the friction factors was the key determinants of the practical friction coefficient.The friction coefficient of rocks was from the friction factors of surfaces of sand particles and was amplified by the later two levels.And the self-similar series asperities themselves can amplify friction coefficients many times.The average angle of asperities inclined plane or fractal dimension is the key influencing factors and the key reason of the differentiation.The influencing factors of arrangements of particles are smaller relatively.The static friction coefficient is bigger than coefficient of the sliding friction caused by the average contact angle.