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对典型岩石摩擦滑动试验装置进行了改进,以8种硅酸盐岩作为研究对象,在低正应力条件下对岩石摩擦滑动过程中的静摩擦系数进行了试验研究。对滑动表面形貌进行了表征,从统计学角度分析了粗糙度对静摩擦系数的影响,并基于滑动表面微凸体(凹凸体、微观粗糙度)对这一影响作进一步分析。研究表明:滑动面为抛光面时,千枚岩、石英岩、岩屑砂岩和石英砂岩的静摩擦系数为0.38～0.47,砾岩、含砾粗粒石英砂岩、中粒岩屑砂岩和中粒石英砂岩的静摩擦系数为0.83～1.07;在粗糙度中,轮廓最大谷深Rm和轮廓最大峰高Rp两个参数导致摩擦滑动中产生不同静摩擦系数,且随着这两个参数的增加,静摩擦系数呈指数规律增加;千枚岩、石英岩、岩屑砂岩和石英砂岩滑动表面的微凸体数量较少,砾岩、含砾粗粒石英砂岩、中粒岩屑砂岩和中粒石英砂岩滑动表面的微凸体数量较多,随着微凸体数量的增加岩石摩擦滑动过程中的静摩擦系数增加。
The typical rock friction and slip test device is improved. Eight kinds of silicate rock are taken as the research object, and the static friction coefficient of the rock in the condition of low normal stress is studied. The morphology of the sliding surface was characterized, and the influence of roughness on the static friction coefficient was analyzed statistically. The influence of the roughness on the sliding surface asperity (asperity and microscopic roughness) was further analyzed. The results show that the static friction coefficient of phyllite, quartzite, lithic sandstone and quartz sandstone is 0.38-0.47 when the sliding surface is polished, and conglomerate, pebbly coarse grained quartz sandstone, middle grained lithic sandstone and medium grain quartz The static friction coefficient of sandstone is 0.83 ~ 1.07. In roughness, the maximum depth of profile Rm and the maximum peak height Rp lead to different static friction coefficients, and with the increase of these two parameters, the static friction coefficient Exponential law increased; Phyllite, quartzite, lithic sandstone and quartz sandstone sliding surface asperities less than the number of conglomerate, gravel coarse quartz sandstone, gravel sandstone and medium quartz sandstone sliding surface The number of asperity is large. As the number of asperity increases, the static friction coefficient increases during the frictional sliding of rock.