Presplitting blasting method for water holes close to high and steep slopes
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A technology of pre-splitting blasting and high and steep slopes, which is applied in blasting and other directions, and can solve the problems of many roots, large blocks, low efficiency and high energy consumption, slope stability, etc., to reduce the root rate, reduce large blocks, and simplify construction Effect
Active Publication Date: 2013-09-11
福建省新华都工程有限责任公司
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Problems solved by technology
Traditional pre-splitting blasting is generally carried out under the condition of dry holes, but for deep concave open-pit mines, especially in areas with developed groundwater, the water content of blast holes can reach 100%. Many blocks, low efficiency and high consumption, and poor slope stability
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Embodiment 1
[0026] A water hole pre-splitting blasting method near a high and steep slope, the method is used for ore mining under the F9 fault near a high and steep slope in a certain mine, and the steps are as follows:
[0027] The first step is to determine the location of the production platform according to the requirements of the step layout, measure the profile of the actual slope to be blasted, and determine the chassis resistance line values at different locations.
[0028] In the second step, according to the profile of the slope, the holes are arranged in the way of reversing holes. The specific technical parameters are:
[0029] 1. The non-coupling coefficient of the water hole pre-splitting hole 5 is 1.5-3.0;
[0030] 2. The distance between the 5 pre-splitting holes of the water hole is 1.5-2.5m;
[0031] 3. The row spacing between the water hole pre-splitting hole 5 and the buffer hole 6 is 2.5 to 3 meters;
[0032] 4. The charge density of the water hole pre-splitting ...
Embodiment 2
[0041] A water hole pre-splitting blasting method near a high and steep slope. This method is except following steps, all the other are with embodiment 1.
[0042] In the second step, according to the profile of the slope, the holes are arranged in the way of reversing holes. The specific technical parameters are:
[0043] 1. The non-coupling coefficient of the water hole pre-splitting hole 5 is 3.0-4.5;
[0044] 3. The distance between the 5 pre-splitting holes of the water hole is 2.0-3.0m;
[0045] 3. The row spacing between the water hole pre-splitting hole 5 and the buffer hole 6 is 2.5 to 3 meters;
[0046] 4. The charge density of the water hole pre-splitting hole 5 line is 2.0-3.0kg / m;
[0047] 5. The parameters of the main gun hole 7 hole network are 4×5~6×5m 2 .
[0048] The third step, the charging structure of this embodiment is a full detonating cord charging structure: first, the explosive 4 is loaded into the bottom of the water hole pre-splitting hole 5, a...
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Abstract
The invention particularly relates to a presplitting blasting method for water holes close to high and steep slopes, which adopts a reversing hole distribution mode to distribute holes according to a profile map of a slope face. The technical parameters are that coefficient of not coupling of water hole presplitting hole (5) is 1.5-4.5, pitch of the water hole presplitting hole (5) is 1.5-3mm, space between rows of the water hole presplitting hole (5) and cushion hole (6) is 2.5-3m, thread stitching density of the water hole presplitting hole (5) is 1.5-3.5 kg / m, and the hole net parameter of a main armament hole (7) is 4x4-6x5m2. Explosive charges (4) are filled in the bottoms of the water hole presplitting hole (5), and then a detonating cord (2) is filled in the water hole presplitting hole (5). Each of the 1-8 times of explosive charges is carried out according to the sequence of repeatedly enabling a spacer (3) to be filled in and enabling the explosive charges (4) to be filled in until completion of filling. After the water hole presplitting hole (5) is plugged, the detonating cord (2) and a non-conductivity booster detonator (1) are connected outside the water hole presplitting hole (5) to make preparation for detonation, and advance detonation time of the water hole presplitting hole (5) is 80-100ms. The presplitting blasting method has the advantages of reducing basal rate, reducing large blocks and being high in efficiency and low in consumption.
Description
technical field [0001] The invention belongs to the technical field of water hole pre-splitting blasting, and in particular relates to a water hole pre-splitting blasting method near a high and steep slope. Background technique [0002] With the development of open-pit mining, more and more large-scale open-pit mines have changed from hillside open-pit to deep concave open-pit, and with the increase of mining depth and steepening of side slopes, more and more groundwater has been produced. Seismic effects are also increasingly affecting the stability of excavated slopes. Therefore, the technology of controlled blasting under high and steep slopes has important practical significance, and has been widely valued by developed countries. [0003] Although the research on explosion in water has a long history and the pre-splitting blasting technology is widely used, it is very difficult to control the blasting due to the "three high" characteristics of explosive explosion and th...
Claims
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Application Information
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