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Experimental study on asperity evolution of joint surfaces
FAN Xiang #,CAO Ping *,JIN Jin
School of Resources and Safety Engineering, Central South University, Changsha 410083, China
*Correspondence author
#Submitted by
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Funding: Central South University students＇ innovation project supported by the Mittal company（No.11MX22）, Supported by the National Natural Science Foundation of China（No.No.51174228）, the graduate students＇ thesis innovation foundation of Central South University（No.2011ssxt275）, Supported by the special research fund for the doctoral discipline of the Ministry of Education（No.20090162110037）
Opened online:19 January 2012
Accepted by: none
Citation: FAN Xiang,CAO Ping,JIN Jin.Experimental study on asperity evolution of joint surfaces[OL]. [19 January 2012] http://en.paper.edu.cn/en_releasepaper/content/4461204
 
 
Laboratory cyclic shear tests were conducted to investigate the asperity evolution of joint surfaces. There were five samples and each sample had been sheared for three times under different normal stresses. Prior to and after each test, the roughness of each specimen was characterized by measuring the surface morphology using a 3D non-contact high-accuracy laser topography instrument (the Talysurf CLI 2000). Nine parameters, used to characterize the morphologic features of joint surfaces, were worked out after each scanning test. With analysing the experimental results, the variations of morphologic features under cyclic shear loading, were found out. In the shear tests under different normal stresses, maximum height, arithmetical mean height and root mean square height of the joint surface had downward tendencies; Skewness, kurtosis and root mean square gradient of the joint surface had no obvious changes and the shape of joint profiles were hardly influenced by shear tests. Developed interfacial area ratio of the joint surface had a down trend and the complexity degree went down. There was a growth in the texture aspect ratio of the joint surface. The anisotropic property of the surface varied little and the surfaces kept anisotropic.
Keywords: joint shear tests; morphology of surface; characteristic patameters; asperity evolution
 
 
 

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