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Large-spacing pillarless mining method

A mining method and technology without bottom pillars, which can be used in surface mining, underground mining, special mining, etc., can solve problems such as relatively few studies, methods of increasing stope structure parameters, etc., to achieve convenient on-site control and improve mining. Ore quality, increase the effect of controlling the amount of ore

Inactive Publication Date: 2018-06-08
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the continuous advancement of mining technology and mining equipment, the segmental caving method without pillars is developing towards the direction of large structural parameters and large mining equipment, and high segmental and large spacing stope structural parameters have appeared in mine production. , but there is relatively little research on the method of increasing stope structural parameters

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Effect test

Embodiment 1

[0032] In an underground mine, the ore body occurs between -36m and -524m. It adopts the plan of phased construction and phased mining, adopts shaft development, and mining by segmental caving method without pillars. The stage height of the first phase of the mining project of the mine is 120m, divided into two middle sections of -78~-138m and -138~-198m, and -198m is the stage transportation level. The original stope structural parameters are: the height of the first segment 6 × the first approach distance 4 = 12m × 10m, the plane size of the ore block is 60m × 50m, when the mining work is carried out to -138m, according to the present invention, one is to adopt The least common multiple method changes the route from 3 to 2 within 30m in the plane direction, and changes the segments from 5 to 4 in the height direction to form a large-space stope structure; the second is to adopt the least common multiple method in the plane In the 20m range in the direction, the route will be...

Embodiment 2

[0034]In a certain production mine, the method of combined development of ramps and shafts, and the sub-level caving method without pillars are used for mining. The stage height of the first stage mining project of the mine is 120m, divided into two middle sections of 0~-60m and -60~-120m, and -120m is the stage transportation level. The original stope structure parameters are: the height of the first section 6×the spacing of the first approach 4=15m×18m, and the plane size of the ore block is 90m×75m. When the mining work reaches -60m, according to the present invention, the least common multiple method is used to change the routes from 4 to 3 within the range of 72m in the plane direction, and change the segments from 4 to 3 in the height direction, forming For the large-space stope structure, the new parameters at this time are: the height of the second section 7×the spacing of the second approach 5=20m×24m, so the area controlled by a single approach changes from 270m² to ...

Embodiment 3

[0036] In an underground iron mine, the ore body is buried between +45m ~ -360m, the ore body strike length is 1200m, the average thickness is 35m, and the dip angle is 75°~85°. 80m, -200m, -320m three stages of transportation levels, each stage is divided into two middle sections. The stope structure parameters originally adopted by the mine are: the height of the first subsection 6×the first approach distance 4=12m×15m, when the mining work reaches -200m, according to the present invention, the least common multiple method is adopted in the range of 90m in the plane direction Change the routes from 6 to 5, and change the segments from 5 to 4 in the height direction to form a stope structure with large spacing. At this time, the new parameters are: second segment height 7 × second approach Road spacing 5 = 15m×18m, so the area controlled by a single access road changes from 180m² to 270m². Since increasing the route spacing will inevitably change the corresponding relationsh...

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Abstract

The invention discloses a large-spacing pillarless mining method, and relates to the technical field. The large-spacing pillarless mining method comprises the following steps: S1, dividing an ore bodyinto a plurality of sections as production level in mining level height, and dividing each section into a plurality of production ore blocks, wherein an extracting drift in the upper and lower sections is of a diamond-shaped arrangement structure, and the bottommost section is used as an upper section; S2, adopting a least common multiple method to enlarge structure parameters of a mining field,obviously increasing the structure parameters of the mining field of a mine on the original basis, forming a transition section, and forming a lower section after the structure parameters of the mining field represent a certain cyclic change rule; S3, arranging an ore discharging connection roadway, a cutting roadway and an air ventilation roadway in a section plane, and blasting and discharging ores in the cutting roadway and the extracting drift according to the requirements of a mining plan. The large-spacing pillarless mining method has the advantage that the structure parameters of the mining field are enlarged by the least common multiple method, so that the stope preparation quantity is obviously reduced.

Description

technical field [0001] The invention relates to the technical field of underground mining methods, in particular to a mining method with large spacing and bottom pillars. 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 two adjacent production levels enter the floor The amount of ore in the interval is used as the ore amount of the segment,...

Claims

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Application Information

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IPC IPC(8): E21C41/22
CPCE21C41/22
Inventor 范庆霞胡海洋范思远
Owner NANJING IRON & STEEL CO LTD
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