Abstract：To study the influence of smooth and rough joint on stress wave propagation in rock mass and the mechanical properties of jointed rocks，experimental research was carried out by using split Hopkinson pressure bar(SHPB) system. The effect of joint matching degree coefficient(JMDC) on the stress wave propagation was qualitatively studied. The projection covering method was used to analyze the joint surface，and the influence of fractal dimension on stress wave propagation was studied. Rough joint surface specimens were obtained from the splitting test，and two standard specimens were combined to obtain the smooth joint surface specimens. To get the same incident stress pulse，a series of SHPB experiments were conducted on the rock specimens with smooth joint and rough joint. It was shown that the transmission coefficients and stiffness of smooth joints rock specimen reduce 2.1% compared with intact rock specimen，the smooth joints have little influence on stress wave propagation in the test. The transmission coefficient and stiffness of joint rock specimens were influenced by the difference of joint forms. The greater the joint roughness(the fractal dimension is 2.088–2.214)，the smaller the transmission coefficient and stiffness of the rock joint specimen，where the equivalent stiffness is approximately linearly reduced and the transmission coefficient is reduced by a quadratic curve. When joint roughness(fractal dimension) were the same，the smaller the JMDC，the smaller the transmission coefficient and the equivalent stiffness，which indicates that JMDC is an important influencing factor of the stress wave propagation.
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2019, Vol. 38 
