Stability analysis for high-steep slope subjected to repeated blasting vibration

摘要

Blasting is a necessary means of mining production and engineering construction in China, while landslides and collapses induced by blasting dynamic load often occur. In this paper, shaking table tests, limit equilibrium theory, and least square method were employed to better evaluate the stability of the slope with the fault zone subjected to repeated blasting vibration. The high-steep slope of the Daye iron mine was selected as a case in this paper, and the shaking table test model was established to analyze the change of shear strength of the slope fault zone subjected to repeated blasting vibration. Also, based on the limit equilibrium theory and the shaking table test data, the change of slope stability coefficient under different parameters was studied. Finally, in order to better control the influence of blasting vibration on the slope in the process of blasting excavation, the loading time of blasting vibration for slope failure under different loading amplitudes was predicted. The results showed that the shear strength changed mainly in two forms, the one was that when the vibration loading amplitude was less than or equal to 1.5 cm/s, the shear strength parameters of the fault zone changed mainly in the form of cumulative weakening, but when the loading amplitude was greater than 1.5 cm/s, the change of shear strength parameters of the fault zone was mainly manifested as inertial force failure. Meanwhile, it was worth mentioning that when the loading amplitude was 2.2 cm/s, the loading times of blasting vibration for slope failure was only 2877.