Method for reinforcing underground mine main chute

Abstract

A method for reinforcing a main ore-pass of an underground mine belongs to the field of the mining engineering. The reinforcing processes are that: 1. in the process of mining of the main ore-pass, a bolt-bond anti-scissor roof bolt (5) and a sprayed concrete sprayed layer (6) reinforce the main ore-pass. 2. an reinforced concrete supporting column (1) of which the diameter of a centre funnel mouth is 3 meters and the height is 8 to 10 meters is constructed upwards at the lower part which is 25 to 35 meters away from the bottom plate of a unloading cavern; on the base of the platform of the supporting column, an reinforced concrete protecting wall of which the thickness is 300 millimeters to 500 millimeters and the height is not lower than that of the reinforced concrete protecting wall of the bottom plate of the unloading cavern is poured upwards along the felled well wall; 3. at the center of the mine ore-pass, the funnel structure which is held by using the high-pressure prestressed anchorage grouting technology, and together with the reinforced concrete supporting column form a forced supporting structure which supports outside and reinforces inside, thereby guaranteeing the lasting stability of the main mine ore-pass; the bottom plate of the unloading cavern can be repaired by adopting a loading beam 7 with the box-typed reinforced concrete structure; the present invention not only can change the strainedcondition of the main mine ore-pass and reduce the pressure of the mine ore-pass coming from ore, but also can save the construction period, reduce the construction cost and improve the capability of the mine ore-pass and the ability of the transportation.

Description

technical field

[0001] The invention belongs to the field of mining engineering, and particularly relates to a reinforcement method for severe collapse of the main shaft of an underground mine. Background technique

[0002] The slip-breaking system of underground mines mainly includes the main shaft, unloading chamber and crushing chamber. The main chute is a critical choke point for ore storage and transport to the surface. The diameter of the main chute is generally designed to be 5m 2 , due to the unavoidable impact and wear of the ore on the wall of the main chute during the unloading process, it is easy to cause collapse, and the area of ​​severe collapse can reach 100m 2 Above, even the roof and floor of the inclined chute and the unloading chamber collapsed completely.

[0003] The conventional method of repairing the main chute is the integral pouring of chip concrete. This method not only has a large amount of work, a long construction period, and high investment...

Examples

Embodiment Construction

[0013] Two main shafts in an iron mine (1 # and 2 # The main chutes) are each 160m long and the horizontal distance is 24m. Among them, 2 # The main chute collapsed at -360m level, and the section of the chute changed from the originally designed 4.9m 2 , down to 100m 2 , the total amount of collapse reaches 5500m 3 , with 1 # The horizontal distance between the main shafts is only 15.6m.

[0014] 2 # The main chute is reinforced by the "support bucket method" structure, and the specific parameters are:

[0015] (1) The surrounding rock mass of the chute is reinforced with full-length bonded shear anchors and shotcrete. The anchor rod is made of ordinary rebar, and its geometric parameters are: length 1.8m, diameter 22mm, and shotcrete thickness 70mm.

[0016] (2) At the level of -388 meters, a reinforced concrete support column with a funnel mouth diameter of 3m and a height of 8.4m was constructed upwards, and reinforced concrete with a thickness of 300mm was poured...

technical field

[0001] The invention belongs to the field of mining engineering, and particularly relates to a reinforcement method for severe collapse of the main shaft of an underground mine. Background technique

[0002] The slip-breaking system of underground mines mainly includes the main shaft, unloading chamber and crushing chamber. The main chute is a critical choke point for ore storage and transport to the surface. The diameter of the main chute is generally designed to be 5m 2 , due to the unavoidable impact and wear of the ore on the wall of the main chute during the unloading process, it is easy to cause collapse, and the area of ​​severe collapse can reach 100m 2 Above, even the roof and floor of the inclined chute and the unloading chamber collapsed completely.

[0003] The conventional method of repairing the main chute is the integral pouring of chip concrete. This method not only has a large amount of work, a long construction period, and high investment...

Examples

Embodiment Construction

[0013] Two main shafts in an iron mine (1 # and 2 # The main chutes) are each 160m long and the horizontal distance is 24m. Among them, 2 # The main chute collapsed at -360m level, and the section of the chute changed from the originally designed 4.9m 2 , down to 100m 2 , the total amount of collapse reaches 5500m 3 , with 1 # The horizontal distance between the main shafts is only 15.6m.

[0014] 2 # The main chute is reinforced by the "support bucket method" structure, and the specific parameters are:

[0015] (1) The surrounding rock mass of the chute is reinforced with full-length bonded shear anchors and shotcrete. The anchor rod is made of ordinary rebar, and its geometric parameters are: length 1.8m, diameter 22mm, and shotcrete thickness 70mm.

[0016] (2) At the level of -388 meters, a reinforced concrete support column with a funnel mouth diameter of 3m and a height of 8.4m was constructed upwards, and reinforced concrete with a thickness of 300mm was poured...

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