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Method for weakening main control coal and rock seam in situ by utilizing wastewater of overburden gob area

A goaf and coal rock layer technology is applied in the field of mine main control coal rock layer wastewater weakening, which can solve the problems of water inrush disaster, not easy to collapse, flooded wells, etc. blast effect

Inactive Publication Date: 2016-11-23
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0006] To sum up, under the existing technical conditions, it can be predicted that most of the working faces have the problem of hard roof or thick coal seam caving top coal is not easy to collapse, and face the threat of water inrush disaster under the existing technical conditions. , but related studies have not yet combined the two. Typical working faces in deep and extra-thick coal seams in China have similar phenomena of water inrush, and even well flooding accidents

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  • Method for weakening main control coal and rock seam in situ by utilizing wastewater of overburden gob area
  • Method for weakening main control coal and rock seam in situ by utilizing wastewater of overburden gob area
  • Method for weakening main control coal and rock seam in situ by utilizing wastewater of overburden gob area

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Embodiment Construction

[0038] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. The specific examples described here are only used to explain the present invention, and are not intended to limit the present invention.

[0039] Implement a method of using waste water from the overlying goaf to weaken the main control coal stratum in situ. This method is implemented in a coal mine where No. 8 and No. 13 coal seams are thick coal seams, of which No. It is directly below the No. 8 coal seam, and the two coal seams are separated by 46m. Currently, the No. 13 coal seam is in the mining stage. The average thickness of the No. 13 coal seam is 15.6m. The upper part is the goaf of multiple working faces of the No. 8 coal seam. It has been ineffective for many years, and the scope and its accumulated water volume are not clear. The technical solution for implementing the present invention is as follows for the above situation:

[00...

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Abstract

The invention provides a method for weakening a main control coal and rock seam in situ by utilizing wastewater of an overburden gob area. The method comprises the step of carrying out pre-splitting by utilizing slotting and vertical stage blasting and inducing the wastewater of the overburden gob area to enter the main control coal and rock seam, so as to prevent coal and rock instability and catastrophic phenomena including abnormal pressure of a stope support, water burst of a coal roof and the like. The method provided by the invention sufficiently utilizes coal mine wastewater which is deposited for many years in the overburden gob area; the wastewater of the gob area gradually seeps into a hard coal and rock seam needing to be softened; and control on the length of a hanging roof length of the main control coal and rock seam and prevention and management on stope disasters are realized, and the method has an obvious effect.

Description

technical field [0001] The invention relates to a method for weakening waste water from a main control coal stratum in a mine, in particular to a method for in-situ weakening of a main control coal strata by using goaf waste water and actively preventing and controlling catastrophe. Background technique [0002] Coal mining goaf waste water and hard roof and thick coal seam are not easy to collapse in the coal mining area under the goaf, which has always been one of the main problems restricting the high production and efficiency of coal mines. After decades of on-site practical experience accumulation and theoretical research and development, the coal mining technology under the goaf has been greatly developed and some achievements have been made. The existing way to deal with the problem of waste water in gobs is to arrange dense water discharge boreholes along the trench, and then discharge the water to the surface in the form of waste water. [0003] Yang Chunlin and ot...

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Application Information

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IPC IPC(8): E21C41/16E21C39/00E21F16/00F42D3/00
CPCE21C39/00E21C41/16E21F16/00F42D3/00
Inventor 杨永康张彦斌康天合季春旭郭泽峰张智敏
Owner TAIYUAN UNIV OF TECH
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