In many large mines, although the 3D visualization technology has been applied to a certain extent, the mining modeling process lacks a unified standard, and the modeling cycle is long [1], especially the establishment of the ore body solid model is still difficult, according to Although the traditional modeling method can realize the three-dimensional visualization of the ore body, its accuracy and modeling efficiency are not ideal [2]. Szechiaying iron ore mine South complex shape, there is no single primary ore or oxide ore, ore is oxidized shallow portion, the ore is divided into classes so that the oxide ore and raw ore 2. In the ore body modeling process, the traditional modeling method is to connect the oxidized ore and the primary ore respectively. This method requires a large number of control lines and transition surfaces, which not only takes more time, but also the practicality of the modeling results. Strong. To this end, this study explores the modeling methods of complex ore bodies for the types of ore bodies in the southern area of ​​the Sijiaying Iron Mine.
1 geological overview
The southern area of ​​Sijiaying Iron Mine is located 8km southeast of Jixian County, Hebei Province, and is under the jurisdiction of Xiangyu Town, Jixian County, Hebei Province, Changning Town and Chengzhuang Town of Funan County. It consists of the South Mine Section, the Dajiazhuang Section, Xiaopo and Tianyu. The Sijiaying South Section starts from the S6# line in the north and the S70# line in the south. The ore body is 6200m long. The Dajiazhuang section is from the north. #线北, South to the big 70# line south, the ore body is 6500m long. The area of ​​the small slope is the exploration line N2#～N6#, and the range of the field is the exploration line S7-1#～S7-2#. The main ore body of the South Ore Section is I# ore body, which is layered and layered. The thickness is relatively stable, but there are many stones, common branching and medium, and the shape is medium. The ore body is not interspersed with large faults and veins. The structure is simple. The main ore body of the Dajiazhuang ore section is II# ore body, which is layered and layered. The thickness is relatively stable, but there are many stones, common branching and medium, and the shape is medium. The ore body is cut by multiple faults and veins. Interspersed, with many faults and large breaks, the ore body is divided into broken blocks and the structure is complex. The main ore bodies in the southern part are all upper oxidized ore, and the ore bodies of the lower primary ore are in a form that cannot be modeled according to traditional modeling methods.
2 ore body modeling method
2.1 Survey line profile collection and finishing
This study collected a section of 50 exploration lines in the southern area of ​​Sijiaying, including 25 exploration lines of S6#～S70# in Tianxing Iron Mine and 21 explorations in 0#～70# of Dajiazhuang Iron Mine. Line, Xiaopo N2#～N6# A total of 3 exploration lines, Tianyu S7-1#～S7-2# A total of 2 exploration lines related information. The collected 50 exploration line profiles were geometrically corrected and three-dimensionally restored by 3DMine software. The outer boundary of the primary ore and oxidized ore was connected to a closed line, and the oxidized primary segmentation interface was retained, as shown in Fig. 1.
2.2 entity connection and oxidation native segmentation interface generation
Connect the collated survey line profile to the entity, as shown in Figure 2. The dividing boundary of the corresponding ore body is connected into a straight line to form an oxidized primary dividing interface, as shown in Fig. 3.
2.3 Oxidation original segmentation interface expansion
Through the secondary development of the 3DMine software, the function extension is extended, and the physical boundary of the split interface is expanded outward without affecting the outer contour of the split interface, so that it can completely penetrate the ore body model. The detailed steps are as follows: 1 First enter "faceext" in the 3DMine command bar, press "Enter", the interface appears, prompting to select to expand
The surface of the exhibition, see Figure 4; 2 select the surface to be expanded, a dialog box appears, see Figure 5; 3 input distance, you can get the expanded surface, see Figure 6.
2.4 Solid Model Segmentation
The solid model is separated by the Boolean calculation function of 3DMine software, and the entity is divided into two by the oxidative primary segmentation interface, so that the oxidized ore and the primary ore become separate entities, as shown in Fig. 7. Delete the extra triangle face in Figure 7 by the "Delete a separate triangle face" command to get the final solid model, as shown in Figure 8.
2.5 model summary
There are many ore bodies in the southern area of ​​Dajazhuang Iron Mine. In this study, the ore bodies in this area are divided into four types: surface oxidized ore, in-situ primary ore, off-balance-sheet primary or extra-surface oxidized ore. The modeling results are shown in the table. 9.
3 Conclusion
Combined with 3DMine software, the construction method of the ore body solid model in the southern area of ​​Sijiaying Iron Mine was studied, and detailed modeling steps were given. The method can classify the ore body type more clearly for the ore bodies with more classifications. For the faults and the conditions of the rock veins to cut off the ore bodies, the ore body can be divided reasonably and accurately. The practice shows that the ore body solid model constructed by this study has no self-intersection problem, can truly reflect the ore occurrence pattern, meet the requirements of later mining design and optimization mining, and has high modeling efficiency, which can be used for similar mine reference.
references
[1] Li Qingquan, Yang Bisheng. Real-time acquisition modeling and visualization of 3D spatial data [M]. Wuhan: Wuhan University Press, 2003.
[2] Zhang Xinyu. Research on Key Technologies of 3D Visual Reserves Auxiliary Analysis System for Geoscience Space [D]. Changchun: Jilin University, 2006.
Author: Wang Dan, Chen Yanting, Songai Dong; Hebei Iron and Steel Group Mining Co., Ltd.;
Article source: "Modern Mining"; 2016.6;
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