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Mining method for replacement of banded coal under building by waste rock

A technology of strip coal pillars and mining methods, applied in underground mining, fillings, safety devices, etc., can solve problems such as low recovery rate and waste of resources, and achieve the elimination of ground gangue, avoid pollution, and reduce air and environmental pollution Effect

Inactive Publication Date: 2007-05-16
CHINA UNIV OF MINING & TECH
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AI Technical Summary

Problems solved by technology

At present, strip mining (hereinafter referred to as "strip mining") is generally used in the mining of coal resources under construction in order to protect surface buildings, but its recovery rate is low (generally about 40%), and resources are seriously wasted.

Method used

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  • Mining method for replacement of banded coal under building by waste rock

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Embodiment Construction

[0016] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0017] In the mining method for replacing striped coal pillars with gangue under buildings in the present invention, the gangue filling roadway b is firstly excavated, and after the excavation is completed and the equipment used during the excavation is removed, the gangue filling equipment is arranged gradually from the inside to the outside. Gangue filling treatment. After filling the gangue to fill the main lane, build a wall with cement to seal it. As shown in Figure 1, the burial depth of strip coal pillars 1, 2, and 3 is 290m, and the width is 50m. The protection level required for the overlying rock structure and surface buildings is Class I, and they are arranged in the center of each strip coal pillar. 3 gangue filling lanes d (if the cross section of the filling lane is designed as a rectangle, the width of the lane is generally 3.5-5.0m (the hei...

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Abstract

The bone coal displacement strip coal block exploration under an architecture, concentrically sets 3-5 bone coals filling lane at the center of each strip coal block, based on the buried depth, width, laminated rock structure and protective degree required by the architecture build on the surface of each strip coal block, advancing coal mining for the 3-5 bone coals filling lane and then filling bone coals from the interior to the exterior inside the lane that has dug out coals. Ensuring the safety of the architectures, filling the displacement coal with bone coals, it can realize exploration rate no less than 20%, the total recovery rate of the strip mining area no less than 65%; Filling the mine with bone coals dug out can not only eliminates the bone coals on the land, reduces the encroachment of farmland, mitigates air and environmental pollution, gets rid of bone coal landslide or explosion and other hidden accidents that may affects the human life but also using bone coals working as the underground support of the mine and realizing second partial recovery for strip coal blocks under the architectures.

Description

technical field [0001] The invention relates to a gangue replacement mining method, in particular to a gangue replacement mining method for strip mining under buildings to protect coal pillars. Background technique [0002] There is a large backlog of coal resources in my country's "three downs" (under buildings, "under construction" for short, under railways, under water bodies). According to statistics, at present in my country, only the production mines of unified coal mines have "three-down" coal pressing amounted to 13.79 billion tons, of which 9.468 billion tons were under construction, accounting for 69% of the total coal pressing. Due to the deformation of the surface caused by underground mining, the building is subjected to additional forces such as tension, compression and bending. When the deformation caused by these additional forces exceeds the allowable deformation of the building, the building will be damaged to varying degrees. Sometimes it even collapses. ...

Claims

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Application Information

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IPC IPC(8): E21C41/16E21F15/00
Inventor 缪协兴张吉雄徐金海陈荣华
Owner CHINA UNIV OF MINING & TECH
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