Covering layer forming method of blind ore bodies

An overburden and ore body technology, applied in the field of underground mining, can solve problems such as high caving costs and large ore dilution, and achieve the effects of controlling waste rock mixing, large block size, and simple stope structure

Inactive Publication Date: 2010-06-16
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the existing blind ore body covering layer formation method, such as high caving cost and large ore dilution, and to provide an improved method for forming the covering layer by the subsection caving method without bottom pillars. The caving project arranged in the surrounding rock of the roof can not only reduce the cost of caving, but also effectively control ore dilution

Method used

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  • Covering layer forming method of blind ore bodies
  • Covering layer forming method of blind ore bodies
  • Covering layer forming method of blind ore bodies

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Embodiment 1

[0016] Further illustrate the essence of the present invention with example below

[0017] Figure 1 ~ Figure 3 The first blind ore body has an average horizontal thickness of 100 meters, and the roof rock 1 has good stability.

[0018] The sub-level caving method without pillars is used for mining. The stage height is 50 meters, the sub-section height is 12.5 meters, and the distance between the roads is 12.5 meters. The continuous goaf formed by the first sub-section mining roadway is used to induce the roof rock to caving and form a covering layer. .

[0019] exist figure 1 and image 3 The first segment (-112.5 meters) is arranged in the ore body, and the distance from the upper ore body boundary 2 is 12.5 meters, and the segments -125 meters and -137.5 meters are arranged sequentially from top to bottom.

[0020] figure 2 In -112.5 meters ~ -150 meters horizontal excavation mining roadway 3, the distance between the mining roadways is 12.5 meters, and rock drilling,...

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Abstract

The invention discloses a covering layer forming method of blind ore bodies with stable and massive roof surrounding rocks applying a bottom pillar-free subsection collapse method. The method can obviously reduce the work quantity of caving, has low caving cost and a little ore dilution, and improves the production efficiency and economic benefit of mines. The key points of the technical scheme are as follows: a first subsection mining tunnel is distributed in an ore body, and continuous gobs provided after the first subsection mining are used for inducing the roof rocks to collapse; and with the performing of the mining work, the areas of the gobs are expanded continuously, when the areas of the gobs reach the critical exposed area, the roof rocks at the gobs are unstable gradually and collapsed under the effects of stress and gravity so as to form a covering layer. When the first subsection mining tunnel distributes blast holes, the ore bodies among the access roads are required to be thoroughly collapse so as to cut off the support of the roof surrounding rocks completely and form continuous gobs with exposed area. The forming method is applicable to forming the covering layer of more stable and massive blind ore bodies of the roof surrounding rocks.

Description

technical field [0001] The invention relates to an underground mining technology, in particular to a method for forming a covering layer by using a pillarless segmental caving method for stabilizing a thick blind ore body with a roof surrounding rock. Background technique [0002] At present, when it is known that the thick and large blind ore bodies with stable roof surrounding rocks are subjected to the segmented caving method without pillars, the formation of the overburden usually adopts the forced caving method, that is, the caving works are arranged in the surrounding rocks of the roof, and deep holes or deep holes are used. The surrounding rocks of the roof were forced to collapse by medium and deep holes to form overburden rocks. Since the caving works are all arranged in the rock, the engineering quantity is large, the time is long, the investment is large, and the caving cost is high; the caving rock has small lumps, good fluidity, and large ore dilution. Content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/16
Inventor 周宗红
Owner KUNMING UNIV OF SCI & TECH
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