Thin basic rock shallow buried coal seam longwall face water retaining mining method

A technology for water-retaining mining and working face, which is applied in surface mining, mining equipment, earth-moving drilling, etc., and can solve the problems of roof water intrusion and sand intrusion, affecting safe production, and wasting coal resources.

Inactive Publication Date: 2007-08-22
CHINA UNIV OF MINING & TECH
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Problems solved by technology

At the same time, in the process of mining shallow coal seams, many coal mines have experienced safety accidents such as roof infiltration, water infiltration and sand intrusion, which affect normal safe production. The problem of water retention and anti-collapse coal mining has always been a typical problem in the development of shallow coal seam

Method used

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Embodiment Construction

[0012] In the method for water-retaining mining of longwall working face in thin bedrock shallow buried coal seam, firstly, according to the information provided by geological survey, the hydrogeological parameters of the overlying rock are analyzed to determine the mining range of longwall working face and the key areas that need local treatment in time, to reduce groundwater loss. High-strength hydraulic supports are selected to ensure sufficient initial support force in longwall mining to control the shear failure from the side of the goaf first, so as to prevent the roof of the working face from sinking and form a water inrush channel. According to the long-term mining experience in the longwall working face, the support force of the support in the longwall working face is guaranteed to be above 8000kN, which can effectively prevent the roof of the working face from sinking or slipping and becoming unstable. Select high-power, high-reliability heavy-duty supporting equipme...

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Abstract

The present invention relates to a shallow coal bed long-wall working face water-retaining mining method, specially it is applicable to safety production of shallow coal bed and water resource protection. Said method mainly includes the following steps: according to the coal bed geologic measurement information data defining mining working face; working face adopts hydraulic supporting frame whose strength is above 8000 KN to make support; selecting and using proper matched equipment for quickly driving said long-wall working face is above 200 m; adopting circulating operation to ensure that the dayly driving sped of the long-wall working face is above 15 m and making local filling and reducing local mining height so as to obtain good effect of protecting water resource.

Description

technical field [0001] The patent of the present invention relates to a water-retaining mining method for longwall working faces of thin bedrock shallow buried coal seams, especially suitable for safe production of shallow buried coal seams, protection of water resources in mining areas, ecological environment construction and improvement of coal resource recovery rate, especially for bedrock Shallow coal seams whose thickness is more than 10 times the mining height. Background technique [0002] The Shenfu-Dongsheng coalfield in the west of my country is located in the northern part of Shaanxi and the southern part of Inner Mongolia, with proven reserves of 223.6 billion tons, accounting for about 1 / 3 of the country's proven reserves. Production base. Since the coalfield is located on the edge of the Mu Us Desert, the thickness of the overlying loose layer is relatively large, ranging from 0 to 76.33m, with an average of 32m, and there is a large amount of phreatic water. T...

Claims

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Application Information

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IPC IPC(8): E21C41/16E21D15/44
Inventor 张东升马立强刘玉德
Owner CHINA UNIV OF MINING & TECH
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