Abstract
The weak interlayers in an open-pit blasting bench affect the uniform distribution of explosive energy. To explore the mechanistic influence of a weak interlayer on the effect of blasting, 9 sets of numerical blasting experiments were constructed using the orthogonal experiment method. The degree of bench crushing after blasting, the maximum velocity of the rock mass at 0.05 s, and the displacement of the back of the bench were thus investigated. The analysis revealed that the impact of the thickness of the weak interlayer, its wave impedance, and its location of occurrence on the bench blasting indicated an ordered decreasing effect. Based on this, the evaluation method for the master weak interlayer and the design plan of the specific charge structure were proposed. The evaluated design proposals were verified through both numerical and field tests. The research results will provide a scientific basis to determine a reasonable charge structure of the bench blasting of rock masses containing weak interlayers.
Highlights
China is a country with more coal and less oil, with its coal output ranked first in the world for many years [1, 2]
A weak interlayer refers to a rock layer with low mechanical strength, long extension, and a certain thickness sandwiched between hard rock layers [13, 14]
Nonreflective boundary conditions were applied on the left, right, and bottom surfaces of the model that were in contact with other rock masses
Summary
China is a country with more coal and less oil, with its coal output ranked first in the world for many years [1, 2]. Open-pit coal mines in Xinjiang often have interbedded, alternating, soft, and hard rock mass strata [7, 8] In such a scenario, the blasting energy is unevenly distributed in the rock body and is facilitated to leak along with the weak layer [9]. In the actual open-pit mine situation, a rock mass bench containing one or more weak interlayers with little difference in mechanical properties is often encountered. Such occurrence makes it difficult to determine the position of the master weak interlayer in the rock mass. A master weak interlayer evaluation was constructed, which considered weak interlayer thickness and wave impedance, etc., providing a scientific basis for the design of bench blasting for an interbedded stratum
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