Mining method for eliminating suspended roof in sill-pillar-free sublevel caving mining
A segmented caving and mining method technology, which is applied in ground mining, underground mining, special mining, etc., to achieve the effects of improving mining efficiency, fully breaking rock mass, and solving the problem of hanging roofs in goafs
Active Publication Date: 2021-10-01
UNIV OF SCI & TECH BEIJING +1
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[0003] In view of this, the embodiment of the present invention provides a mining method for eliminating the suspended roof in the segmented caving mining without pillars, which can improve or solve the suspended roof phenomenon existing in the segmented caving method without pillars
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Embodiment 1
[0053] see Figure 1 to Figure 11 As can be seen, the mining method provided by the embodiment of the present invention for eliminating the overhanging roof of sub-level caving mining without pillars is mainly applicable to underground ore mining projects.
[0054] The mining method for eliminating the subsection caving mining suspension roof without pillars comprises the steps of:
[0055] S110, drilling: drilling at least one row of fan-shaped blastholes 2 in the area to be mined on the roof of the roadway 1 obliquely upwards, such as figure 1 shown.
[0056] In this embodiment, the angle between the plane where each row of blastholes is located and the direction of roadway excavation is preferably 80° to 100°, the diameter of the fan-shaped blastholes is 55 to 110mm, the depth of the blastholes is 5 to 20m, and the distance between the holes is 400 to 100mm. 700mm, the hole depth is 10-30m, and the angle between adjacent holes in each row of blast holes is 10-15 degrees. ...
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Abstract
The invention discloses a mining method for eliminating a suspended roof in sill-pillar-free sublevel caving mining, and relates to the technical field of underground ore mining. The mining method comprises the steps that a blast hole is filled with a first annular kerf cartridge bag and a one-way energy-gathered kerf cartridge bag at an interval; the rest blast holes are filled with second annular kerf cartridge bags, multidirectional longitudinal kerf cartridge bags and common cartridge bags at intervals; the first annular kerf cartridge bag and a second annular kerf cartridge bag at the bottom of the blast hole are firstly detonated, and high-energy flow density gas which is generated instantly when the first annular kerf cartridge bag and the second annular kerf cartridge bag are detonated and collected in the annular kerf direction is utilized to directly impact the wall of a rock body around the bottom of the hole, and meanwhile, oppositely cut rock bodies between adjacent blast holes, so as to form a through explosion crack in the rock body at the bottom of the hole; and then the multidirectional longitudinal kerf cartridge bags and the common cartridge bags in the other blast holes are detonated in sequence to promote the expansion of explosion cracks. The goaf top suspension phenomenon can be improved or solved, and rock body crushing is more sufficient, so that the ore blasting extraction efficiency is improved; and the mining method is suitable for underground ore extraction engineering.
Description
technical field [0001] The invention relates to the technical field of underground ore mining, in particular to a mining method capable of solving the problem of roof suspension caused by sub-pillar caving mining. Background technique [0002] At present, the pillarless segmental caving method is widely used in underground mining operations. However, in the existing segmental caving method without pillars, when the fan-shaped blastholes are arranged, the distance between two adjacent blastholes increases continuously with the increase of the blasthole depth, and the sandwiching effect of the rock increases significantly. There is no better solution, which leads to the inability to form a penetrating explosion crack in the rock mass at the bottom of the blasthole, and then the phenomenon of the goaf hanging from the roof occurs. Contents of the invention [0003] In view of this, the embodiments of the present invention provide a mining method for eliminating the suspended...
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Login to View More IPC IPC(8): F42D3/04F42D1/00E21C41/22
CPCF42D3/04F42D1/00E21C41/22
Inventor 杨仁树郭洋许鹏龚敏王德胜张召冉陈程丁晨曦左进京
Owner UNIV OF SCI & TECH BEIJING