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Strip type coal mining method in roof cutting filling close-to-gob areas

A coal mining method and strip-type technology, which are applied in surface mining, earthwork drilling, underground mining, etc., can solve the problems of destroying land resources and groundwater resources, increasing the economic burden of coal mines, increasing investment, etc., and achieving simple support. The effect of safety, control of surface subsidence, and reduction of filling costs

Active Publication Date: 2018-03-06
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] Environmental problems: my country's coal mines generally adopt the caving method of mining, which causes rock formation damage and movement, leads to surface mining subsidence, destroys land resources and groundwater resources, and discharges a large amount of gas, coal gangue, and mine water at the same time, polluting the environment
[0006] At present, coal mines mainly adopt solid waste paste filling mining to deal with the problem of coal mining. Solid waste paste filling mining utilizes solid waste such as gangue, and controls the damage of the roof and floor rock layers of the coal mining face, reduces mining subsidence, and protects the ground. However, there are still development bottlenecks in this method: insufficient filling materials, the need for foreign materials, increased investment, and increased the economic burden of coal mines

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  • Strip type coal mining method in roof cutting filling close-to-gob areas
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  • Strip type coal mining method in roof cutting filling close-to-gob areas

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Embodiment Construction

[0043] The present invention provides a strip-like coal mining method for top cutting and filling adjacent goafs. In order to make the purpose, technical scheme and effect of the present invention clearer and clearer, the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0044] The invention provides a strip-like coal mining method for top cutting and filling adjacent goafs, which comprises the following steps:

[0045] Step 1, the size of strip mining is smaller than the first caving step distance L of the immediate top 0 , to keep the roof from collapsing, the small strip coal pillars are mined first, and the large strip coal pillars are left, and the thickness of the roof directly after mining the small strip coal is:

[0046]

[0047] where: m z — immediate roof thickness;

[0048] h—mining height of sma...

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Abstract

The invention provides a strip type coal mining method in roof cutting filling close-to-gob areas. The strip type coal mining method comprises the following steps: when the size of strip mining is smaller than a direct roof cutting secondary caving step L0, remaining no caving of a roof plate, firstly adopting small strip coal pillars, and maintaining large strip coal pillars, wherein the ratio ofextraction to the reservation of the small strip coal pillars to the large strip coal pillars is 1: 2; forming open-off cuts in the small strip coal pillars, mining remaining small strip coal pillarsin a drawing-back mode when the small strip coal pillars reach an upper gate road, forming roof cutting shot holes in two boundaries of the small strip coal pillars along the upper gate road, miningthe small strip coal pillars, and beginning hole firing and roof cutting from the upper gate road; after the small strip coal pillars are mined completely, mining the nearby large strip coal pillars on one side of the small strip coal pillars, cutting off small strip coal to cut broken waste rocks obtained from an immediate roof, filling while mining until the mining is completed. The suspended size of the roof plate is remained to be smaller than the distance of first roof caving all the time, the top plate does not cave, and the shoring is relatively simple and safe; the dimension in a goafplane is decreased by about 4 / 5, the ground surface settlement can be effectively controlled, and the method is hardly of destructive effect for the environment.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to a strip-like coal mining method for top cutting and filling adjacent goafs. Background technique [0002] Coal is my country's primary energy source. Experts predict that China's coal output will reach 4.5-5 billion t / a in the next 50 years, and coal will account for no less than 50% of the country's energy. Coal will always be China's primary energy source. However, there are three major problems in my country's coal industry that restrict the development of coal mines: [0003] Safety issues: roof management issues; rock burst; water inrush on the roof and floor of the working face, etc. [0004] Low recovery rate: The population in the eastern and central regions of my country is dense, and the "three downs and ones up" coal pressing mainly in village buildings is very serious. The traditional "three-down-up" coal pressing mainly adopts the strip method of mining, mining one strip...

Claims

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Application Information

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IPC IPC(8): E21C41/18F42D1/00F42D3/04
CPCE21C41/18F42D1/00F42D3/04
Inventor 沈宝堂王昌祥孙熙震孟凡宝路瑶刘音张新国崔博强郭皓
Owner SHANDONG UNIV OF SCI & TECH
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