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Method for exploiting soft and broken ore body

A mining method and technology for ore bodies, which are applied in the field of sub-pillar-free caving mining, can solve the problems of poor operation safety conditions, large amount of supporting works, and high mining costs, reduce requirements, ensure mining effects, and improve ore mining. rate effect

Inactive Publication Date: 2010-06-02
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of poor operating safety conditions, large amount of supporting engineering, high mining cost and low recovery rate when mining soft and broken ore bodies by the sub-section caving method without bottom pillars, and to provide a soft and broken ore This method can effectively solve the problem of mining roadways being damaged by ground pressure, improve the stability of roadway engineering and the utilization rate of mining roadways, reduce support costs, improve operating safety conditions, and reduce mining costs. Improve ore recovery rate

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  • Method for exploiting soft and broken ore body
  • Method for exploiting soft and broken ore body
  • Method for exploiting soft and broken ore body

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Embodiment

[0014] Example: such as Figure 1 ~ Figure 4 In a certain ore body, the buried depth is below -150 meters, the average horizontal thickness is 50 meters, the average dip angle is 60°, and the ore rock is soft and broken.

[0015] Caving pressure relief without pillars is adopted. Firstly, the ore body of the first segment is excavated and recovered, and the pressure above the lower (second and below) segments to be mined is transferred to the rock mass around the ore body, so that There is no excessive stress concentration in the mining area, and the mining operation is carried out under the condition of pressure relief; the stability problem of the first segmented mining roadway is solved by supporting and increasing the spacing.

[0016] The first segmental mining roadway adopts support forms such as shotcrete anchors, anchor net spraying, etc., and the blasting work requires that the ore body between the mining roadways be collapsed to form a continuous goaf; the lower segm...

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Abstract

The invention discloses a sublevel caving method for exploiting a soft and broken ore body without a sill pillar. By using the method, the problem that developing roadways are destroyed by ground pressure is effectively solved, the stability of the roadway engineering and the utilization rate of the developing roadways are improved, the support cost is lowered, the operational safe condition is improved, the mining cost is lowered, and the ore recovery is raised. The technical proposal comprises the following key points: depressurizing by the sublevel caving method without a sill pillar, firstly tunneling and backstoping a first-section ore body, transferring the pressure above an area to be backstoped of next section to the rock mass around the ore body to ensure no over high stress concentration in the backstoping area so as to form a stress decrease area, and excavating in the stress decrease area, wherein the first section uses a large backstoping roadway distance to ensure the stability of the backstoping roadway. The invention is suitable for exploiting a soft and broken ore body in the high-stress area by the sublevel caving method without a sill pillar.

Description

technical field [0001] The invention relates to an underground mining technology, in particular to a pillarless segmental caving mining method capable of safely and efficiently mining soft, broken ore bodies in high-stress areas. Background technique [0002] At present, when using the known pillarless segmental caving method to mine soft, broken and high-stress ore bodies, the method of supporting and stabilizing is usually used to control the stope ground pressure, that is, to optimize the mining sequence by comprehensive application, to control the roadway section specification, to simplify Measures such as smooth blasting technology, joint support of shotcrete and anchor mesh, and reduction of recovery units are used to ensure the stability of the mining roadway during recovery. Due to the soft and broken rock, affected by mining ground pressure, roadway excavation and support are difficult, serious collapse, high repair rate, poor operation safety, large amount of suppo...

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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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