Water-rich blasting treatment method for lower goaf roof of open-pit mine
A processing method and technology for goafs, applied in the field of blasting, can solve problems such as difficult construction, enlargement, and poor construction, and achieve the effects of eliminating potential safety hazards, simple construction technology, and fast construction speed.
Inactive Publication Date: 2020-12-29
中铁十九局集团矿业投资有限公司
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Problems solved by technology
In this case, the roof of the goaf is treated by caving blasting. If the method of reserving the rock formation at the bottom of the hole is used, the depth of the blasting hole cannot be accurately designed, and it is very easy to cause the roof to be completely broken and caving due to the excessive thickness reserved, or the blasting effect is not good. The rock mass clamping cannot collapse. If the scheme of penetrating and hanging holes is adopted in the contour range, the general hanging hole sealing method will be difficult to construct due to the influence of the water layer, and the bottom sealing effect cannot be guaranteed. Explosives are easy to Loss from the bottom of the hole causes waste and increases the difficulty of blasting construction control
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[0022] The following will refer to the attached figure 1 , attached figure 2 , attached image 3 , attached Figure 4 , to further fully describe the present invention,
[0023] (1) Put the sonar equipment 1 into the water-filled cavity 3 through the drill hole on the surface for detection, and grasp its accurate cavity contour. The complete vertical projection profile of the void;
[0024] (2) According to the outline of the goaf and the surrounding terrain, the geometric center of the outline of the goaf is used as the reference to lay out the blasting holes according to the total blasting parameters, and all design adopts vertical holes, and the inclination of the control holes is kept within 3°;
[0025] (3) Starting from the center reference hole A, the holes penetrate the gob roof at intervals in the surrounding direction, such as solid circles such as BCD in the figure, and record the actual penetration depth L in sequence 1 , L 2 , L 3 , L 4 ;
[0026] (4) Ot...
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The invention provides a blasting treatment method for a lower goaf roof of an open-pit mine in a water-rich state. The blasting treatment method comprises the following steps that the outline range of the water-rich goaf roof is preliminarily detected and mastered; and according to the goaf contour and the surrounding terrain, blasting hole sites are distributed with the goaf contour geometric center as the benchmark according to designed blasting parameters, and all design adopt vertical holes; the central reference hole site is taken as a starting hole to penetrate through the goaf roof towards the peripheral spaced hole sites, and the actual penetration depth is recorded; other holes in the goaf contour range are constructed according to the design depth obtained by subtracting 1.5-3 mfrom the mean value of the penetration depths of surrounding holes; the bottoms of the penetration holes are blocked by air bags with pendant bodies, gravel with the diameter of 1-3cm is used for backfilling for 1m, and then tailings are used for backfilling for 2m for compaction; and after drilling charging, backfilling and network connection, detonation is carried out. The method is simple, convenient, high in speed and capable of well solving the problem of water-rich caving blasting treatment of the lower goaf roof of the open-pit mine.
Description
technical field [0001] The invention belongs to the technical field of blasting, and in particular relates to a caving blasting treatment method in which the roof of a water-filled goaf in the lower part of an open-pit mine is also rich in water. Background technique [0002] Roof caving blasting treatment is currently a commonly used goaf treatment scheme in open-pit mines. Due to the influence of measurement errors, instrument deviations, azimuth effects, and magnetic declinations, it is difficult to accurately grasp the shape of the goaf roof through laser scanning. Usually, the explosive blasting treatment is carried out in the form of blasting holes within the penetration range according to the outline of the goaf and backfilling the hoisting holes. However, when the goaf is filled with water and the roof is also rich in water, laser scanning is completely ineffective. The data of the goaf roof Basically completely missing. In this case, the roof of the goaf is treated...
Claims
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IPC IPC(8): F42D1/00F42D1/08F42D3/04
CPCF42D1/00F42D1/08F42D3/04
Inventor 莫麟王继野于洋陈帅李成峰赵鑫
Owner 中铁十九局集团矿业投资有限公司