›› 2013, Vol. 34 ›› Issue (3): 674-678.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of influence of asperity on static friction coefficient for polished rock surface

HAN Wen-mei1, 2，KANG Tian-he2   

  1. 1. School of Science, North University of China, Taiyuan 030051, China; 2. Institute of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2012-11-16 Online:2013-03-11 Published:2013-03-20

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Abstract: The typical experiment apparatus of rock friction sliding was designed and improved. Under low normal stress, the static friction coefficients for 8 silicate rocks were studied experimentally based on the apparatus. The surface topography of the sliding surface was characterized by the statistic parameters and asperity; and the influence of roughness parameter on static friction coefficient was analyzed. When the sliding surfaces are polished, the static friction coefficients of phyllite, quartzite, lithic sandstone, and quartz sandstone are 0.38-0.47; and the ones of conglomerate, gravelly coarse quartz sandstone, medium grained lithic sandstone, and medium grained quartz sandstone are 0.83-1.07. The two roughness parameters which are the maximum depth of profile valley (Rm) and the maximum height of profile peak (Rp) make the asperity produce different actions and induce to different static friction coefficients. With the increment of the two roughness parameters, the static friction coefficient is increased with exponential law. The amounts of asperity are less on the sliding surfaces of phyllite, quartzite, lithic sandstone, and quartz sandstone. The amounts are more on the ones of conglomerate, gravelly coarse quartz sandstone, medium grained lithic sandstone, and medium grained quartz sandstone. With the increment of asperity amounts, the static friction coefficient is increased during rock frictional sliding.

Key words: frictional sliding, silicate rock, static friction coefficient, asperity, roughness

CLC Number: 

  • TD 325
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