Optimization and Comparative Experimental Study of Charge Structure of Water Medium Interval on Open-air Step
Received date: 2023-05-22
Revised date: 2023-07-28
Online published: 2024-01-26
Aiming at the unfavorable blasting effects of the open-air step stripping blasting，such as large blocks and many root bottoms，the blasting effect of the open-air step was optimized by adopting the two-stage charge structure of water medium interval at the bottom of the blast hole and the middle part.To obtain the optimal two-stage charge structure of water medium interval in step stripping blasting of the open-pit mine，the blast hole pressure of the air-medium and water-medium interval charging were discussed from theoretical analysis，the unit consumption of water medium interval charge structure in Wujiata open-pit mine was optimized by experiments.On the basis of the selected optimal unit consumption，three groups of three-dimensional models of different water medium interval charge structure were established by using ANSYS/LS-DYNA numerical simu-lation software.The optimal water medium interval charge structure was selected by analyzing the stress change curve of rock mass，rock mass damage range，and free surface tensile crack area ratio at the bottom of the blast hole，the middle of the lower charge，and the upper position of the blast hole.The blasting effect was evaluated from the index of boulder yield by the blasting comparative experimental with the charge structure of air medium interval.The research results show that blasting with a charge structure of a water medium interval can significantly increase the blasting pressure and improve the rock-crushing effect.The optimal unit consumption of water medium interval charge structure blasting in Wujiata open-pit mine is 0.33~0.34 kg/m3，saving 0.03~0.04 kg/m3 unit consumption of explosives than before. The blasting of a charge structure with an upper water medium interval of 1 m and the lower water medium interval of 1 m has more stress on the rock mass and has a long duration，the damage is evenly distributed along the blast hole，the range is regular，and the free surface tensile crack area accounts for the highest proportion，and its blasting effect optimal.The blasting fragmentation indexes of the optimal water medium interval charge structure all show a good proportion.The research results can provide a reference for the application of water medium interval charge structure in open-pit step blasting.
Honglu FEI , Hainan JI , Jie SHAN . Optimization and Comparative Experimental Study of Charge Structure of Water Medium Interval on Open-air Step[J]. Gold Science and Technology, 2023 , 31(6) : 930 -943 . DOI: 10.11872/j.issn.1005-2518.2023.06.077
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