Open-pit mine blasting technical method for avoiding large blocks in frozen layers
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A technology of frozen layers and large blocks, applied in the field of mining engineering blasting, can solve the problems of large frozen blocks and poor blasting effects of frozen layers, and achieve the effect of ensuring the filling length
Inactive Publication Date: 2020-03-13
伊春鹿鸣矿业有限公司
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[0003] The purpose of the present invention is to solve the problem that the blasting effect of the frozen layer in the above-mentioned prior art is relative
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Embodiment 1
[0030] like figure 2 As shown, drilling is carried out on the frozen layer 1 with a thickness of about 2m. According to the actual terrain conditions, the azimuth is measured, and the holes are arranged in a triangle. The row spacing of the holes is different according to the lithology. The roller cone drilling rig drills blastholes on the blasting work platform with frozen layers;
[0031] Hole loading: According to the blast hole obtained by the drilling machine used, the hole diameter of the blast hole is 250mm, and the interval charge is used. First, the emulsion explosive 3 with a blast hole depth of 9 / 17 is continuously loaded into the blast hole, and then the blast hole is backfilled with a depth of 7. / 34 backfill gravel 2, after backfilling the gravel, install emulsion explosive 3 with a depth of 1 / 17 of the blast hole, and then backfill gravel 2 with a depth of 7 / 34 of the blast hole;
[0032] Detonation method: three detonators 4 are installed in each blast hole, ...
Embodiment 2
[0035] The depth of the blast hole in this embodiment is 17m, and the specific steps are as follows:
[0036] Step 1: Drilling: According to the actual terrain conditions, measure the azimuth, determine the hole position and hole row spacing, and use a 250mm-diameter roller cone drill to drill a blast hole on the blasting work platform with a frozen layer. The depth of the blast hole is 17m;
[0037] Step 2: Loading holes: According to the blast hole obtained by the drilling machine used, the hole diameter of the charge blast hole is 250mm, and the interval charge is used. First, the blast hole is continuously charged with 9m, and then backfilled with 3.5m of crushed stone. After that, charge 1m of powder, and then backfill 3.5m of crushed stone;
[0038] Step 3: Detonation method: each blast hole is equipped with three detonators, and the detonators are installed in the detonating bomb to increase the detonation energy and ensure that the explosives can be detonated. like ...
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Abstract
The invention provides an open-pit mine blasting technical method for avoiding large blocks in frozen layers, and belongs to the technical field of mining engineering blasting. The open-pit mine blasting technical method comprises the following steps: (1) drilling holes: detecting directions, determining hole positions and hole row distances of holes according to actual topographic conditions, drilling blast holes in a blasting operation platform with a frozen layer by using a rotary drilling machine with an aperture of 250mm; (2) loading hole: performing interval loading according to obtainedblast holes, first continuously filling 9/17 of each blast hole by explosives, then backfilling 7/34 of each blast hole by broken stone, then filling 1/17 of each blast hole by explosives, and then backfilling 7/34 of each blast hole by broken stone; and (3) determining a detonating mode: arranging three detonators in each blast hole, wherein the detonators are mounted in a detonating bomb, and are respectively arranged on a continuous filling part at the bottom, under the continuous filling part, and in the middle place of an upper filling part, a guide line of each detonator is connected with a nonel on the ground surface, and detonating is carried out by a blaster. According to the invention, continuous loaded explosive columns mainly have a loosening effect on the frozen layer, and modified explosive columns directly act on the frozen layer to exert a crushing effect, so that generation of large blocks is effectively avoided.
Description
technical field [0001] The invention relates to an open-pit mine blasting method for avoiding large blocks of frozen layers, and belongs to the technical field of mining engineering blasting. Background technique [0002] Loosening blasting is generally implemented in large-scale open-pit mine blasting projects, and the blasting quality is required to meet the requirements of shovel loading and transportation and gyratory crushers for the lumpiness of ore. At present, the more commonly used perforating equipment is the roller cone drill (250mm aperture), and the design of the hole network parameters will vary according to the nature of the rock. For a step with a design step height of 15m, the commonly used hole row spacing is 8m×6m, the super depth is 2m, the blast hole depth is 17m, the lower continuous charge is about 10m, and the backfill height is about 7m, such as figure 1 shown. In the cold north, there is generally a 2m thick frozen layer on the surface in winter. ...
Claims
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