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An open-pit mining method for high-temperature goaf

A mining method and goaf technology, applied in blasting and other directions, can solve problems such as the inability to meet the safety operation requirements of high temperature goafs, and achieve the effects of eliminating the hidden danger of premature explosion, strictly prohibiting ideas, and having strong practicability.

Active Publication Date: 2020-07-14
CHINA GEZHOUBA GRP EXPLOSIVE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an open-pit mining method for high-temperature goafs in view of the deficiency that the prior art cannot meet the requirements for safe operation in high-temperature goafs

Method used

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  • An open-pit mining method for high-temperature goaf
  • An open-pit mining method for high-temperature goaf
  • An open-pit mining method for high-temperature goaf

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Example 1, see figure 1 , figure 2 , image 3 , Figure 4 , an open-pit mining method for a high-temperature goaf, comprising the following steps:

[0059] S1. Determination of the hazard level of the goaf: determine the hazard level of the goaf according to the geophysical prospecting data, the step height of the operation platform and the classification standard of the hazard level of the goaf;

[0060] S2. Precise positioning of the goaf: use the drilling detection method to accurately locate the position and scale of the goaf, so as to obtain the contour boundary of the goaf;

[0061] S3, temperature detection and fire extinguishing and cooling: use the drilled detection holes in the goaf to detect the internal temperature of the goaf; use the three-phase foam cooling method to extinguish the fire and cool down the goaf;

[0062] S4, layout of blasting blast holes: arrange blasting blast holes penetrating through the goaf above the proven goaf according to the bl...

Embodiment 2

[0090] Example 2, see Figure 5 , an open-pit mining method for a high-temperature goaf, wherein, in the step of precise positioning of the goaf in the S2, the following steps are included:

[0091] S2.1b, Determination of the position and depth of the preliminary exploration drilling in the goaf: according to the geophysical prospecting data, set the initial exploration drilling position on the operation platform; The height of the steps is 40m, and the drilling diameter is set as the design diameter of the blasting hole is 200mm;

[0092] S2.2b, the driller of the reference detection blast hole: the driller drills the first detection blast hole according to the determined initial exploration drilling position and depth of the goaf, and judges whether the detection blast hole is drilled through the goaf during the drilling process; , then define the detection blasthole as the reference detection blasthole, and execute the next step; if not, re-determine the position of the i...

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Abstract

The invention discloses an open-pit mine exploitation method for a high temperature goaf. The method comprises a step of determining a hazard level of the goaf according to geophysical data, the stepheight of a working platform and a classification level standard of the goaf, a step of accurately positioning the position and scale of the goaf by using a drilling detection method to obtain the contour boundary of the goaf, a step of detecting the internal temperature of the goaf by using a drilled detection blasthole in the goaf, a step of performing fire extinguishment and cooling on the goafby using a three-phase foam cooling method, a step of laying blasting blastholes passing through the goaf above a proven goaf according to the row spacing requirements of the blasting blastholes, a step of blasting to allow rocks to fall after filling the positions above the goaf and surrounding blastholes by using a reverse filling method and an uncoupled charging structure, and a step of performing effect evaluation by comparing ratios before and after the collapse of the rocks above the goaf. According to the method, the accurate detection of the goaf is achieved, and the safety of on-siteequipment and personnel is ensured through the processing of accurate positioning, rapid cooling, blasting and the like on the high temperature goaf.

Description

technical field [0001] The invention relates to an open-pit mining method in a goaf, in particular to an open-pit mining method for a high-temperature goaf. Background technique [0002] With the development of large-scale mining, loading, excavating and transporting equipment, many underground coal mines in Xinjiang, Ningxia, Shanxi and other places in my country have gradually converted to open-pit re-mining. Most of the data has been lost and cannot be traced. On the other hand, a large number of gobs have been formed due to the private excavation and excessive mining of small coal mines in history. Due to the influx of air, the spontaneous combustion of the remaining coal seams in the goafs caused the surrounding coal seams and rocks to be continuously heated, and the incomplete combustion of coal accumulated a large amount of toxic and harmful gases in these goafs, which further deteriorated the safety of the goafs. In the internal environment, the existence of these hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/00F42D1/08
CPCF42D1/00F42D1/08
Inventor 朱宽曹进军郝亚飞王国庆鲁国涛
Owner CHINA GEZHOUBA GRP EXPLOSIVE CO LTD