Medium-deep hole construction and blocking treatment method in large fault section of sublevel caving method without bottom pillar

A segmented caving method and construction method technology, which is applied in the field of underground mining, can solve the problems of affecting the blasting effect, prone to clamping, and large safety risks, so as to ensure the blasting effect, avoid safety risks, and reduce the charge amount. Effect

Active Publication Date: 2020-10-09
YUXI DAHONGSHAN MINING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During medium and deep hole rock drilling, if faults and surrounding rocks intrude into the ore body, it is very easy to have brazing phenomenon, which makes medium and deep hole construction more difficult
After the construction of the middle and deep holes is completed, due to the long-term shelving and the impact of the surrounding blasting vibration, it is easy to cause the middle and deep holes in this part to be blocked, making it impossible to charge and blast
Or the poor integrity rate of medium and deep holes during charge blasting affects the blasting effect. After blasting, the phenomenon of hanging roof and pushing and discharging is easy to occur, which brings a greater safety risk to the shovel loading and mining, and because it is difficult to deal with the hanging roof, it seriously affects Production organization of the entire block

Method used

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  • Medium-deep hole construction and blocking treatment method in large fault section of sublevel caving method without bottom pillar
  • Medium-deep hole construction and blocking treatment method in large fault section of sublevel caving method without bottom pillar
  • Medium-deep hole construction and blocking treatment method in large fault section of sublevel caving method without bottom pillar

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Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1 Medium and deep hole construction

[0049]The mining area of ​​the Dahongshan Iron Mine is mined by the high-segment, large-spacing and non-bottom-pillar segmental caving method in the upper and lower mining areas. The eastern footwall of the 340m segment is at the junction of the ore and rock, and is damaged by the FII-1 large fault. Blasting passes through this When it is in a weak rock formation zone, the problem of hole blocking is very likely to occur. The hole blocking will lead to poor blasting effect, and the situation of vertical walls and suspended ceilings will easily occur. The 49th and 50th rows of the 524 approach road in the eastern footwall of the 340m section are just at the position of the FII-1 major fault. The distance between the middle and deep holes 5 is 2.6mm, the hole diameter is 76mm, and the depth is 25mm. The explosive filling amount of the middle and deep holes 5 in a single row is 1800Kg.), offset 0.3m to the east and make up 4...

Embodiment 2

[0050] Embodiment 2 Clogging treatment

[0051] When the 340m sub-section 657 route blasted to the 5th row in the upper and lower mining area of ​​Dahongshan Iron Mine, affected by the fault and blasting vibration, the browline hole span was high and the hole damage was serious (4 key deep holes were blocked), which did not meet the requirements. The blasting conditions or the probability of roof overhang after blasting are extremely high. The actual measurement shows that the blockage depth is about 10m. According to the geological conditions of the site and the mine section, it is judged that the fine slag in the fault is blocking the hole, so the method of blowing the hole with high-pressure air is used to deal with it, such as figure 2 , 2 deep holes were dealt with, but there were still 2 deep holes not connected, and the blocked positions of the two holes were both at about 12m. In order to ensure the blasting effect and reduce the large block rate, the detonator 8 is...

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Abstract

The invention discloses a medium-deep hole construction and blocking treatment method in a large fault section of a sublevel caving method without a bottom pillar. According to the method, reserved medium-deep holes are constructed during blasting to the large fault section, according to a fault occurrence state and combing an actual situation of roof side walls of an on-site roadway, hole diameters of the medium-deep holes are reduced, the row distance between the medium-deep holes is reduced, the medium-deep holes are encrypted, the explosive payload of a single row is reduced, and 3-5 auxiliary deep holes are pre-supplemented at the positions of 10-30cm after withdrawing on the basis of the original arrangement of the medium-deep holes; and through the series of measures, the phenomenonof hole plugging caused by overlong laying time after medium-deep hole construction is avoided. According to the method, the hole blocking processing sequence of high-pressure air washing hole-detonator punching-sleeve hole- hole filling is adopted to solve the problem of middle-deep hole blocking, the method can be used for safely and efficiently processing the hole blocking from easy to difficult to advance step by step, so that the blasting effect is guaranteed, and the problems of suspended ceiling, vertical walls and extrusion of a stope are avoided.

Description

technical field [0001] The invention belongs to the technical field of underground mining, and in particular relates to a method for constructing a deep hole in a section of a large fault by a segmental caving method without a bottom pillar and a blockage treatment method. Background technique [0002] The mining process of the pillarless segmented caving mining method is mainly three steps of medium and deep hole rock drilling, charge blasting, and shovel loading. In the middle and deep hole rock drilling process, if faults and surrounding rocks intrude into the ore body, the phenomenon of brazing is very likely to occur, which makes the middle and deep hole construction more difficult. After the construction of the medium and deep holes is completed, due to the long-term shelving and the impact of the surrounding blasting vibration, it is easy to cause the medium and deep holes in this part to be blocked, making it impossible to charge and blast. Or the poor integrity rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/16
CPCE21C41/16
Inventor 赏克强普绍云孙卫许朋涛王军陈旭
Owner YUXI DAHONGSHAN MINING
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