A closed free face cutting blasting method for improving blasting efficiency
A free and efficient technology, applied in blasting, earthwork drilling, mining equipment, etc., can solve problems such as unsatisfactory cutting effect, large clamping effect, and complicated working environment, so as to improve cutting efficiency, reduce consumption, The effect of improving construction safety
Active Publication Date: 2022-07-08
ANHUI UNIV OF SCI & TECH
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Problems solved by technology
[0002] In the mining of underground mineral resources such as coal, when the hardness coefficient of the rock roadway is f>7, the mining method basically adopts blasting excavation. In the blasting tunneling of the roadway, the cutting effect directly determines the cycle footage. , there is only a single free surface, the clamping effect is large, and the general cutting effect is not ideal
Method used
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Embodiment 1
[0044] figure 1 and figure 2 The layout of the shaft blasthole based on closed free face cutting is given, image 3 and Figure 4 The layout of the blastholes based on the closed free surface cutting is given, including the cutting hole 1, the cutting hole 2, the first auxiliary hole 3, the second auxiliary hole 4, the third auxiliary hole 5, the peripheral hole 6 and closed free surface 7.
Embodiment 2
[0046] refer to Figure 5 , 6 , for use when the lithology is hard or the lithology is poor, on the basis of Example 1, a hole 8 is arranged between the two cutting holes 2 .
Embodiment 3
[0048] Figure 7 A schematic diagram of a blasting tube with controlled crack propagation direction is given, including an explosive cavity 9 containing explosives, a cavity 10 equipped with wave-blocking materials such as rubber pads and soft cloths, and an energy venting slot 11 with an angle 12 of 60°. .
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The invention discloses a closed free-face undercut blasting method for improving blasting efficiency, belonging to the technical field of mining construction, comprising: sequentially arranging undercut holes, cutting holes, first auxiliary holes, second auxiliary holes, The third auxiliary hole and the peripheral hole are prepared to have a blasting tube that controls the direction of crack propagation; first, put the explosive into the blasting tube, then put the blasting tube with the explosive into the cutting hole, and adjust the cutting direction of the blasting tube with the gun stick. The cutting direction of the cutting hole can form a ring-shaped closed free surface; the ordinary coils are put into each blast hole in turn, and the blast holes are blocked in turn with blast mud; finally, the differential detonation is adopted. In the invention, the cutting hole is detonated before the undercutting hole, and a closed annular free surface is formed around the undercutting hole. The closed annular free surface can improve the undercutting effect, thereby reducing the overall amount of explosives and reducing the impact of explosives on the surrounding rock mass. , the hazards and costs caused by adjacent structures, improve blasting efficiency and construction safety.
Description
technical field [0001] The invention relates to a blasting method, in particular to a closed free surface undercut blasting method for improving blasting efficiency, and belongs to the technical field of mining construction. Background technique [0002] In the mining of underground mineral resources such as coal, when the rock roadway hardness coefficient f>7, the mining method basically adopts blasting excavation. In the roadway blasting and excavation, the cutting effect directly determines the cycle footage, but due to the complex working environment of the underground roadway , There is only a single free surface, the clamping effect is large, and the ordinary cutting effect is not ideal. SUMMARY OF THE INVENTION [0003] The main purpose of the present invention is to provide a closed free surface undercut blasting method for improving blasting efficiency in order to solve the deficiencies of the prior art. [0004] Object of the present invention can be achieved...
Claims
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IPC IPC(8): F42D1/00F42D1/08F42D3/04E21D9/00
CPCF42D1/00F42D1/08F42D3/04E21D9/006
Inventor 苏洪龚悦李凯汪灿冯伟曹帅马亮杰吴学鹏王馨
Owner ANHUI UNIV OF SCI & TECH
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