矿物成分对抛光岩石表面摩擦特性影响的试验研究

Experimental studies on influence of mineral composition on frictional characteristics of polished rocks

在对8种岩石矿物成分XRD分析和使用三维白光干涉仪对其抛光表面进行表面形貌表征的基础上,在自行设计的试验装置上,对自然、饱水和干燥状态下8种岩石试块的摩擦系数进行了试验研究。试验结果表明:抛光岩石表面的摩擦系数和其矿物成分相关。在多矿物组成成分的硅酸盐岩中,饱水与自然状态时的摩擦系数增加幅度大于干燥和自然状态时摩擦系数减小的幅度。在多矿物组成成分的碳酸盐岩中,饱水与自然状态时的摩擦系数增加幅度小于干燥和自然状态时摩擦系数减小的幅度。在3种不同状态下单矿物岩石的摩擦系数比多矿物岩石的摩擦系数变化幅度大。

Analyzing the mineral composition of 8 kinds of rock types by XRD,and characterizing surface morphology of polished rocks by 3-D white light interferometer,frictional coefficients of 8 kinds of rock types in natural,saturated and dry conditions are investigated by means of the self-designed test apparatus.The experimental results indicate that the frictional coefficients relate to the mineral composition.The increment amplitude of frictional coefficients under saturated and natural conditions is greater than that under dry and natural conditions for silicates composed by multiple-stripe minerals.The increment amplitude of frictional coefficients under saturated and natural conditions is much smaller than that under dry and natural conditions for carbonates composed by multiple-stripe minerals.The variation of frictional coefficients of rocks composed by homogeneous mineral is larger than that of rocks composed by multiple-stripe minerals.