Abstract
In China, mining blasting vibration has seriously threatened the safety and stability of high and steep rock slopes. In this paper, taking the east mining area of Jianshan Phosphorus Mine as the research background, combined with field survey, field blasting test, numerical simulation and theoretical analysis, we systematically studied the adjacent high-steep rock slope and the layered blasting technology of complex ore. Based on wide hole spacing blasting numerical simulation and field tests, the use of 8 × 4 m hole network parameters, oblique line hole-by-hole initiation method, detonator delay using 35 ms between holes, 65 ms between rows and 500 ms within the holes, the rock mass rate was reduced and the drilling workload was decreased. In addition, regression analysis was carried out on a large amount of vibration test data, and the attenuation law and propagation law of blasting vibration of adjacent high and steep slopes were predicted, which provided a reference for mine production blasting. By establishing a mathematical model of cumulative damage of rock mass blasting, it shows that the depth of impact of mining blasting on the slope of Jianshan open-pit was 0–3.6m, but the blasting did not cause overall damage to the adjacent high and steep slopes. In the future, this model can be used to predict rock damage caused by subsequent blasting.
Highlights
In recent years, with the mining of China’s mineral resources, the mineral economy has promoted the rapid development of the social economy
After the resumption of mining in the east mining area of Jianshan Phosphorus Mine, by accelerating the slope unloading speed, the slope change rate was effectively slowed down, which provided a guarantee for the continuous mining work below (Li et al, 2021)
Field blasting test, numerical simulation and theoretical analysis, this paper systematically studies the open-pit layered blasting technology of a complex mine adjacent to high and steep slope
Summary
With the mining of China’s mineral resources, the mineral economy has promoted the rapid development of the social economy. Li et al used a comprehensive study method combining theoretical analysis, field testing, and numerical simulation to develop a collaborative blasting technology for high and steep slopes and underground tunnels (Li et al, 2019). The propagation and superposition process of the explosion equivalent stress is a major difficulty in studying the mechanical stability of adjacent high-steep slopes under blasting vibration. Against these challenges, the east mining area of Jianshan Phosphate Mine in Yunnan Province is taken as the research object. Combined with on-site investigation, on-site blasting tests, numerical simulation and theoretical analysis, the open-pit layered blasting technology of complex ore near high and steep slopes was systematically studied. In order to be able to collect the complete element equivalent stress value, the solution time of this simulation is 200 ms, and the calculation step is 1 ms
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