The formula of PPV threshold is derived to evaluate slope stability.
Consequently, the fault can be simplified as semi-infinite crack and the blasting P-wave is selected to study the interaction based on the dynamic fracture mechanics in this paper. Because the tip of fault is always deeply buried, we can focus on the interaction between body waves and the fault tip and neglect the influence of surface waves. Both body and surface waves exert a significant influence on the fault. In general, blasting seismic waves consist of body waves (including P- and S-waves) and surface waves. In blasting engineering, the peak particle velocity (PPV) is always selected as the index for the dynamic stability of rock slopes. Huang and Wu derived the formula of slope stability factor under the incidence of blasting waves and discussed the influence of duration and dominant frequency.
constructed a similar laboratory slope model and discussed the influence of weak layers on slope stability subjected to a single borehole basting. Some but insufficient studies on slope stability have been carried out in the recent years. Consequently, the slope stability is controlled by these geological defects. All the slopes contain geological defects, such as fault, potential sliding surface. In fact, intact rock slopes do not exist. adopted the particle flow to simulate the failure process of pit slopes. adopted the discontinuous deformation analysis method to evaluate the slope stability under bench blasting. adopted the discrete element method and the strength reduction method to analyze the stability of the slope in an iron mine. analyzed the stability of rock slopes under the impact of underground blasting by the finite difference method. studied the stability of the San Pedro cliff at the Alhambra in Granada, Spain, based on the finite element method. studied the dynamic stability of the rock slope in Pasir coal mine based the finite element method and in-situ vibration tests. Numerical simulation is a powerful method to analyze and evaluate the slope stability. proposed the equivalent acceleration and Sarma method to analyze the dynamic stability of a rock slope in Jinping I hydropower station. studied the dynamic stability of a rock slope based the Hoek-Brown failure criterion. studied the dynamic stability of reinforced slopes by considering different failure modes. ĭynamic stability has been extensively studied around the world. As the necessary means in mining, rock excavation, and other constructions, blasting brings huge benefits on the other hand, blasting-induced geological disasters are nothing new across the world. Due to depletion, underground mining will be adopted in more and more mines. With the continuous exploitation of near-surface mineral resources in China, the open-pit mining slopes continue to become higher and steeper, whose stability is declining. Results show that (1) the PPV threshold decreases with the increasing Young's modulus and Poisson's ratio, but increases with the increasing frequency (2) the initiation angle is immune to Young's modulus and the frequency, and only depends on the Poisson's ratio (3) the PPV criterion is finally determined as 1.47 cm/s when the frequency f ≤ 10 Hz, 1.47 cm/s–3.30 cm/s when 10 Hz 50 Hz, which are far less than that of intact rock slopes (4) The north slope is quite safe if the proposed PPV threshold is not violated due to the variation range of the initiation angle θ 0. The influence of frequency, Young's modulus, and Poisson's ratio is studied to modify the PPV threshold. In background of Daye iron mine, the peak particle velocity (PPV) threshold is determined based on the linear elastic fracture dynamics. The P-wave component of blasting seismic waves is focused on and the fault is simplified as a semi-infinite crack. In this paper, the stability of a rock slope imbedded with a fault is considered. In fact, intact rock slopes do not exist and slope stability is controlled by the geological defects. The blasting excavation exerts a significance influence on the slope stability. The open-pit mining slopes continue to become higher and steeper with the continuous exploitation of near-surface mineral resources.