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Mining method in process of passing connection roadway

A mining method and roadway technology, applied in ground mining, underground mining, special mining, etc., can solve problems such as unbroken ore, easy production of large ore, uncontrollable contact roadway roof ore, etc., to achieve convenient on-site control, The effect of simple process management

Inactive Publication Date: 2015-06-17
李祥凤 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This approach has the following disadvantages: First, there is no blasthole control between the side hole of the fan-shaped blasthole and the roof of the connecting roadway, so the ore in between cannot be broken, and large pieces of ore are likely to be produced
Second, due to the large ore, the ore drawing effect at the corresponding position in the next section of this area will be adversely affected
The third is that the fan-shaped blastholes arranged in the next section of this area cannot control the ore above the roof of the connecting roadway, and it is very easy to have a ceiling blasting fault in the subsequent blasting work

Method used

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  • Mining method in process of passing connection roadway
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  • Mining method in process of passing connection roadway

Examples

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Effect test

Embodiment 1

[0024] In a large underground iron mine, the ore body occurs between -36m and -524m, the strike length is 1372m, and the horizontal thickness is 824m. It adopts the joint development of vertical shafts and slopes, and the mining method of segmental caving without pillars. According to the occurrence conditions of the ore body, the mine adopts the stope structure parameters of 12m×10m in the first-phase mining project, and arranges a connecting roadway every 60m, and adopts the stope structure parameters of 15m×15m in the second-phase mining project, A connecting roadway is arranged at an interval of 75m. During the period of the Tenth Five-Year National Science and Technology Research Program, the mine adopted the large-interval stope structural parameters of 15m×20m. With the continuous increase of stope structural parameters, the ore rock entity between the connecting roadway and the two adjacent roadside holes becomes larger. If it is not charged and blasted, it will affect ...

Embodiment 2

[0026] An underground non-ferrous metal mine, the ore body occurs between 350m and -50m, the strike is NW275°, the dip is NNE, the dip angle is 85°, the strike length is 1300m, and the average thickness is 150m. The joint development of vertical shafts and slopes is adopted, and there are no bottom pillars in segmental caving legal mining. Between 280m and 160m, the mining approach is perpendicular to the direction of the ore body. The adopted stope structure parameters are 15m×25m and 20m×25m. A connecting roadway is arranged every 90m in the thickness direction of the ore body. There are 3 connecting roadways, and the mining work is carried out from the footwall of the ore body to the bottom wall. The rock drilling and blasting parameters are: the diameter of the blast hole is 76mm, the minimum resistance line is 1.8m, the distance between the bottom of the hole is 1.8-2.2m, and the angle of the side hole is 60°. 2 to 3 rows are blasted each time. The traditional method is ...

Embodiment 3

[0028] In an underground iron mine, the ore body occurs between 590m and 280m, with a strike of NW275°, a dip of NNE, a dip angle of 45°, a strike length of 1300m, and an average thickness of 500m. It adopts the joint development of inclined shafts and ramps, and sub-level caving without pillars legal mining. Between 560m and 380m, the mining approach is perpendicular to the direction of the ore body, and the adopted stope structure parameters are 20m×20m. A connecting roadway is arranged every 100m in the thickness direction of the ore body, and a maximum of 7 connecting roadways are arranged in the vein. The mining work is carried out by cutting the channel in the middle of the ore body and then proceeding to both ends. The rock drilling blasting parameters are: the diameter of the blast hole is 76mm, the minimum resistance line is 1.8m, the distance between the bottom of the hole is 1.8-2.2m, and the angle of the side hole is 60° (for To increase the width of the ore openin...

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Abstract

The invention relates to a mining method in a process of passing a connection roadway. According to the mining method, a plurality of symmetric or asymmetric parallel (or bundle) blast holes are constructed in a connection roadway between two adjacent stope accesses, blast is carried out when the stope accesses pass the connection roadway under the condition of not changing normal stope sequence of each access, and crushed ores are recovered at the next subsection. The mining method disclosed by the invention has the advantages that: (1) when a mine adopts stope structure parameters with larger intervals, the plurality of symmetric or asymmetric parallel (or bundle) blast holes are constructed in the connection roadway between the two adjacent stope accesses for carrying out charge blasting, and ores between side holes and the connection roadway can be crushed; (2) after the ores between the side holes and the connection roadway are crushed, the crushed ores are positioned above a drawn-out body of a stope access at the corresponding position of the next subsection and have not influence on an ore drawing process, thereby being beneficial to improvement of loss depletion index of the position; and (3) the parallel (or bundle) blast holes are constructed in the connection roadway for carrying out charge blasting, and thus the mining method has the advantages of simpleness in process management and convenience for field control and can obtain a favorable effect when applied to mines with larger access intervals.

Description

【Technical field】 [0001] The invention relates to an underground mining technology, in particular to a mining method through a connecting roadway. 【Background technique】 [0002] Pillarless segmented caving method is a mining method with simple structure, high safety and high efficiency, and convenient management. It is widely used in underground mines in metallurgy, nonferrous metals, and chemical industries in my country. The main parameters of pillarless sub-caving mining include stage height, ore block size, sub-section height, approach distance, ore-caving step distance, etc. [0003] The mining features of the segmental caving method without pillars are as follows: According to the occurrence conditions of the ore body, the stage height is divided into several segments according to a certain value as the production level, and each segment is divided into several production mines. blocks, and the mining approaches in the upper and lower sections are arranged in a diamo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/16E21C41/22
Inventor 李祥凤王江
Owner 李祥凤