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Abstract Blasting is necessary to work in most open-pit mining and the impact disturbance produced by continuous blasting operations will weaken the long-term stability of open-pit slopes. In order to study the influence of impact disturbance effect on the creep characteristics of rock, we processed the argillaceous shale from the weak interlayer into rock samples with a size of 150mm*75mm*75mm, and carried out shear creep tests under different impact energy disturbances with the self-developed rock impact-shear creep test system . We draw the following conclusions based on the test results:(1) The impact disturbance has a significant interference effect on the shear creep failure of soft rock. With the increase of the impact disturbance energy, the accelerated creep duration and the total creep failure time of the soft rock are shortened, and shear creep failure strength decreases. (2) The impact energy can affect the spread characteristics of the shear failure surface of rock samples. The impact disturbance energy destroys the rock sample structure, resulting in an increase in the number of shear cracks. (3) The total deformation of the rock sample is positively correlated with the impact energy. The total deformation of the rock sample is positively correlated with the impact energy. With the increase of impact energy, the proportion of plastic deformation is larger and the proportion of elastic deformation is smaller.After applying a disturbance of 7.09J impact energy, the ratio of plastic deformation to total deformation is not less than 73.1%.According to the test results, a damage factor D based on impact energy is introduced, and a shear creep damage model of soft rock considering the impact disturbance effect is established. The BFGS algorithm and the 1stOpt general global optimization mathematical software are used to identify the model parameters. It is found that the established model can better describe the whole process of shale creep deformation under impact disturbance. This paper provides a certain theoretical basis for the long-term stability research of mine slope under blasting disturbance effect.
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Received: 08 March 2022
Published: 28 October 2022
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2022, Vol. 43 
