Morphological parameters relationship between both surfaces of matched joints

• 1、School of Resources and Safty Engineering,Central South University, ChangSha 410083
• 2、School of Resources and Safty Engineering,Central South University,Changsha 410083

Abstract：It has been widely accepted that the morphological characteristics of joint surface have significant influences on both mechanics and hydraulics properties of the joint. In order to study the morphological characteristics of artificial joints, well-matched joints were made with Brazilian tests in this study. Both the upper and lower walls of each joint were scanned by the Talysurf CLI 2000. So various morphology parameters of each joint surface, including Sp, Sa, Ssk, Sku, peak and JRC, were achieved through computing. These parameters of upper and lower fracture surfaces have been compared and analyzed to investigate several laws as follows: (1) The Sp, Sa and Sku values of the upper wall of a well-matched joint are approximately equal to those of the lower matched joint wall, but those values of different joints are quite different; (2) In most matched joints, one of the Ssk values is positive while the other is negative. Sometimes a couple of the Ssk values are both negative in few joints; (3) The peak distribution curves of both joint surfaces have the same variation tendency, and the peaks intensively distribute in the middle heights; (4) The JRC value of the upper surface is approximately equal to the lower one.

Keywords： matched joint in rock mass morphological parameters peaks JRC