Determining the rock mechanical parameters by static experiments is of great significance for optimizing the open-pit bench blasting scheme and improving the blasting effect.Therefore，the rock mass in an open-pit copper mine in China was taken as the research object，by applying the HM-82L rebound hammer whose impact kinetic energy is 0.735 Nm，a large number of in-situ measurements of rock mass mechanical properties were conducted.Meanwhile，dozens of standard samples were prepared from the on-site rock core.On the one hand，the test of rock longitudinal wave velocity was carried out by using SET-PLT-02 ultrasonic testing instrument，and the uniaxial compression experiment was performed as well based on the MTS-322 hydraulic-servo mechanical testing machine.The result of field rebound measurement indicates that the rebound value of the porphyry at the southern end of the mining area is greater than that of the skarn at the northern end，and the rebound value gradually decreases with the increase of the weathering degree of the rock mass.In addition，the results of indoor physical and mechanical test show that the variation laws of rock wave velocity，uniaxial compressive strength and elastic modulus are generally consistent with the rebound value，it is shown from the fitting curves that there are linear positive correlations between P-wave velocity，uniaxial compressive strength and rebound value，whereas an exponential correlation is generated between elastic modulus and rebound value.All the fitting correlation coefficient indicate that it is reliable to estimate the rock wave velocity and basic mechanical parameters by using the rebound value.The achievements of this study provide a reliable methodology to quickly and reliably obtain the basic physical and mechanical indicators of the rock mass in the open-pit copper mine.

中国自然资源报

http://www.goldsci.ac.cn/article/2022/1005-2518/1005-2518-2022-30-4-550.shtml