Water conservation coal cutting method for small and medium-sized coal mines in waterhead area

Abstract

The invention discloses a water conservation coal cutting method for small and medium-sized coal mines in a waterhead area. The method comprises the following steps: 1, defining the position of a coal bed, that is, defining the thickness and the buried depth of the coal bed in an exploited coal mine according to a boring log; 2, defining exploitation parameters, that is, defining a roof rock beambearing load, the higher limit value Lmax of the width of an exploitation strip, and the lower limit value Dmin of the width of a coal pillar; 3, defining an exploitation scheme, that is, defining the mining and the reservation widths during strip exploitation according to the Lmax and the Dmin, wherein the width L0 of a strip exploited during strip exploitation is smaller than or equal to Lmax, and the width D0 of a reserved coal pillar is larger than or equal to Dmin; and 4, exploiting, that is, exploiting the coal bed according to the conventional strip exploitation method, and reserving acoal pillar of which the width is D0 every time when a strip of which the width is L0 is exploited. The water conservation coal cutting method has the advantages that the design is reasonable; the implementation is convenient; the maneuverability is high; the using effect is good; and the problems of easily caused great loss of the phreatic water resource, and poor water conservation coal cuttingeffect during the conventional exploitation of the small and medium-sized coal mines in the waterhead area are solved.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a water-retaining coal mining method for small and medium-sized coal mines in water sources. Background technique [0002] The problem of "water-conserving coal mining" in the large coalfield in northern Shaanxi has attracted attention from all sides since the beginning of the development of the Shenfu mining area. The total area of ​​northern Shaanxi is 8.06×104km 2 , about 39.2% of the total area of ​​Shaanxi Province. It contains water area of ​​9.5×104hm 2 , accounting for 24.5% of the province's water area. The total amount of water resources in northern Shaanxi is only 10.9% of that in Shaanxi Province, and the per capita water resources are 849m 3 / person, which is 72% of the per capita water resources in Shaanxi Province and 35% of the national per capita level. It can be seen that the amount of water resources in northern Shaanxi is relatively poor. ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a water-retaining coal mining method for small and medium-sized coal mines in water sources, which is reasonable in design, convenient in implementation, strong in operability and good in use effect, and can effectively solve the problems in the existing technology. Mining in small and medium-sized coal mines with water sources can easily lead to a large loss of phreatic resources, poor water retention and mining effects, etc.

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