No-wall filling technology for top-loading filling and layer mining

JIAOJIA gold ore using the approach to the filling level of mechanization mining method, layer change during extraction, the route closed by the wooden walls calibration, first goaf tailing filled to the top line connection (connection line from the top of the top plate About 1 m), then fill the top with a 1:10 filling material [1].

In recent years, with the continuous updating of mining technology and the continuous improvement of mine production capacity, mining enterprises have higher and higher requirements for mining efficiency, and the shortage of full-tail mine filling of wooden walls has become more and more obvious [2]. The wallless filling technology can not only effectively solve the problem of slurry leakage and collapse of the wooden wall, but also shorten the construction period and improve the mining efficiency. To this end, this study provides a basis for the optimization of the balance of filling and filling and the improvement of the balance of loading and unloading by comparing and analyzing the filling technology of the upper filling and the replacement layer.
1 Mine Overview
The Jiaojia Gold Mine is located in Laizhou City. This study is based on the analysis of the 104 stope in the second section of the Jiaojia Mining Area. The main structure in the stope is the main ore-controlling fault of the upper part of the ore body. The overall trend is 50°, the inclination is NW, the inclination angle is about 27°, and a layer of black fault mud with a thickness of about 5 cm is developed on the fracture surface. The secondary structures developed inside the orebodies are mainly NE- and NW-oriented fissures produced by conjugates, joint structures, followed by gently inclined near-horizontal structures, and near-NE-fracture joints tending to NW or SE. The stability of the rock in the stope is moderate, the intersection of joint fissures, the rock is relatively broken, its stability is relatively poor, and it is easy to form a triangle. The approach of the stope is basically arranged along the direction of the ore body, and the mining method is filled by the upward horizontal mechanized approach.
2 no wall filling technology solution
In view of the shortcomings of the existing filling process in Jiaojia Gold Mine, in order to avoid the leakage of slurry and the collapse of the slab wall, an improved scheme of pre-pressing to the ore body is proposed. The specific construction sequence is to carry out the minimum backfilling of the stone after the completion of the construction site inspection and acceptance [3]. After backfilling to the calibration position, the wall is not required to be closed, and the roof is directly pressed from the design position, and the roof is to be pressed to the lower boundary of the ore body. The geotextile is laid on the filling to prevent slurry leakage, and the filling pipeline is set up. The filling material is directly filled from the previous layer to the lower layer (Fig. 1). First, the full tailing sand is filled to 1 m from the top plate, and then changed to 1: 10 Fill the material to fill the top, continue construction after the top.

3 Comparison and analysis of original filling scheme and no-wall technical scheme

In order to analyze in detail the characteristics of the original filling scheme and the no-wall technical scheme in terms of engineering quantity, construction period and economic benefit, the calculation of the 04 and 041 roads in the middle section of the 104 section was carried out. The results are shown in Table 1. As can be seen from Table 1:

(1) From the top of the pressure to the filling position of the lower layer of the 6th layer ore body, the excavation amount of the two methods is equal. After the original filling scheme is pressed to the flat slope position, a 12m approach is required, and the inlet specification is 3.5m× 3.5m, the bottom plate is tailings, and the new filling scheme is always the topping. Compared with the original scheme, the bottom plate is more efficient for tailings.
(2) The filling area of ​​the original filling scheme is much larger than the new method, which results in waste of filling materials. The new filling scheme directly backfills the original medium-pressured topstone into the original goaf, which not only saves transportation costs and filling materials. Cost, and shortened the construction period to improve efficiency.
(3) The original filling scheme requires 6 shifts for closed filling. When the closed wall is filled, it needs to be filled for a period of time to be filled before the filling can be continued to prevent the slab leakage and the filling body from being connected [4], resulting in subsequent mining work. It can't be completed smoothly; the new filling scheme has no need to estimate the leakage of the wall of the wall without the wall. It can be directly filled to the position of the top line and then returned to the water treatment, which is more efficient.
4 Conclusion
Taking the 104 stope of the second division of the Jiaojia mining area as the research object, based on the analysis of the basic principle of the no-wall filling technology scheme, the details of the no-wall filling scheme and the original filling scheme are carried out by the upper-layer filling method. Comparing and analyzing, it is considered that the no-wall filling technology is not only superior to the original filling scheme in solving problems such as displacement of the wall of the panel and the failure of the wooden wall to be reused, but also has obvious advantages in construction period, construction cost and construction efficiency. , which will greatly improve mining efficiency.
references
[1] Jie Shijun. Underground mining of metal deposits [M]. Beijing: Metallurgical Industry Press, 2008.
[2] China Academy of Safety Production Science. GB16423—2006 Safety regulations for metal non-metallic mines [S]. Beijing: China Standard Press, 2006.
[3] Liu Tongyou. Filling mining technology and application [J]. Beijing: Metallurgical Industry Press, 2011.
[4] Zhang Zhuocheng, Zhang Haijun, Shen Zhaokui, et al. Orthogonal test analysis of factors affecting filling quality [J]. Mining Research and Development, 2009(1): 9-11.
Author: Li Xiaofei, Li Weining; Shandong Gold Group Jiaojia gold;
Zhao Peng iron; Shandong Yulong Mining Group righteous energy coal mine;
Article source: "Modern Mining"; 2016.6;
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