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

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...

AI Technical Summary

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 seams in western my country.

However, for shallow coal seams where the bedrock thickness is more than 10 times the mining height (the bedrock thickness is generally greater than 50m), if the above-mentioned coal mining method is still used, the waste of coal resources will be very serious, which is a major problem that needs to be solved urgently on site