Abstract
The density of geological exploration boreholes is one of the main bases for blasthole charge structure design. Due to the low density of geological exploration boreholes, it is impossible to obtain the blast hole rock formations' distribution accurately. With the development and application of intelligent drilling rigs, the lithology distribution data of the blasthole can be accurately obtained, and a blasthole charge structure design method based on the lithology distribution is proposed. The blasthole lithology data collected by the intelligent drilling rig is divided into 7 categories according to the rock hardness, and the adjacent strata with similar lithology are combined and divided into two groups of soft rocks and hard rocks. According to the rock stratum grouping data of the blasthole and the unit explosive consumption of each type of lithology, the explosive amount and charge length required for the soft rock group and the hard rock group can be calculated, respectively. Finally, the blasthole charge structure is designed according to the thickness and charge position of the hard rocks. With the C++ programming language, this method is realized and applied in the Shengli Open-pit Coal Mine of Inner Mongolia Autonomous Region of China. The application results show that, compared with the traditional hole charging structure design method, this method can realize accurate segmented charging of the hole, improve the blasting effect and the degree of rock fragmentation, and reduce the blasting cost.
Highlights
The density of geological exploration boreholes is one of the main bases for blasthole charge structure design
Use intelligent drilling rigs to obtain the lithology distribution in the blasthole, and divide the blasthole rock strata into two groups in terms of the hardness of the lithology: hard rock and soft rock, in this way, the amount of explosive and the length of the charge required for the soft rock group and hard rock group are calculated respectively
In terms of the hardness of the rock, the blasthole lithology is divided into 7 categories, and the adjacent rock strata with similar lithologies are combined and grouped into two: soft rocks and hard rocks; 2
Summary
The density of geological exploration boreholes is one of the main bases for blasthole charge structure design. With the development and application of intelligent drilling rigs, the lithology distribution data of the blasthole can be accurately obtained, and a blasthole charge structure design method based on the lithology distribution is proposed. The application results show that, compared with the traditional hole charging structure design method, this method can realize accurate segmented charging of the hole, improve the blasting effect and the degree of rock fragmentation, and reduce the blasting cost. Later in 1954, Marchenko increased the energy utilization rate of explosives in blasting and proposed to fill the broken air gap of rock and the cavity of jet blasting, forming the prototype of the concept of segmented charges[3]. Air-space charging technology has gradually entered the project, and it has achieved considerable development
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