岩石破裂面的摩擦特性研究

Research on the Friction Properties of Rock Fracture Plane

研究了自然状态和接触面掺泥两种情况下的砂岩、泥岩破裂面及其互层接触的摩擦特性。结果表明,在自然状态下,砂岩、泥岩的接触面的力-位移曲线具有相同形态,都能很快达到峰值强度;当接触面掺泥时,砂岩和泥岩的粘聚力和内摩擦角都有不同程度的降低,其中粘聚力下降尤其明显,与自然状态下相比,其剪切应力和摩擦位移关系曲线发生了变化,剪应力与摩擦位移关系曲线也有不同,但是粘滑现象明显渐弱。

Friction properties were studied while sandstone and mudstone fracture plane contacted with its interbed both in the natural state and on the condition of mud blended. Results show that the stress-displacement curves obtained for the interface of sandstone and mudstone have the same shape in the natural state, both reaching the peak strength very quickly. And the cohesion and inner friction angle all reduced to some extent while the interbed blended with mud, with the cohesion reduced markedly. In this situation, the stress-displacement curves changed, and were quite different from those in natural state, with the stick-slip phenomenon significantly weakened.