Thin-base-rock shallow coal-layer water-retaining production suitable-condition classification method

Abstract

The invention discloses applicable classification method for mining under the shallow bedrock of thin seam keeping water conditions. Apply to thin seam overlying shallow bedrock aquifer water loose the protection of water resources. At first according to the feature of structure or Shallow bedrock, the height of leading water crevasse under different mining height is analyzed and calculated. The estimate formula: HL=9.29M+10.6 can be used to determine the height HL of leading crevasse water under the shallow bedrock of thin seam to the different mining height M. The mining waterproofing security coal rock pillar protector thickness of the thin bedrock shallow submersion coal bed long well working surface is 10 m. According to the classification situation of loose water-bearing stratum water body, the bedrock thickness which is needed is determined under the condition of different mining height. According to classification situation and mining height, mining is separated into reinsurance water mining according to the bedrock thickness. This method has good water resources protection effect, is safe in production, and has high coal resource returns-ratio.

Description

technical field [0001] The patent of the invention relates to a method for classifying applicable conditions for water conservation and mining of thin bedrock shallow coal seams, especially for water resource protection of loose aquifer water bodies above thin bedrock shallow coal seams, improvement of coal resource recovery rate, and guarantee of safe production. Background technique [0002] Surface and groundwater seepage and pollution, and phreatic water level drop seriously during the development of shallow coalfields. For example, the coal seams in Shenfu Dongsheng mining area are shallowly buried (within 200m), the bedrock of the roof is thin, and the surface is covered by thick aeolian sand, which makes the mining of shallow coal seams encounter great difficulties. At the same time, the precious phreatic water hidden under the loose overburden of the desert is lost in the process of ore mining, which has caused great harm to the surface vegetation, the life of reside...

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Problems solved by technology

[0003] At present, although intermittent mining or short-wall comprehensive mechanized continuous mining methods have been adopted for water-retaining coal mining, the recovery rate of coal resources in these methods is low

In addition, although in some areas, on the basis of reasonable selection of hydraulic supports, the water-conservation mining method of rapid advancement of large-scale longwall working faces supplemented by local treatment measures (local reduction of mining height or partial filling) has been adopted, there has been no systematic water-conservation mining. According to the classification method, the water retention effect is not satisfactory, and it also poses a hidden danger to safe production. Therefore, it is a major problem to be solved urgently to classify the applicable conditions for water retention mining of thin bedrock shallow coal seams according to the bedrock thickness.

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