Treatment method for top plate sandstone water of Jurassic coal field

A roof and sandstone technology, which is applied in the field of roof sandstone water treatment in Jurassic coalfields, can solve the problems that it is difficult to achieve ideal, there is no ideal treatment method for roof sandstone water, and the pore size is small, so as to reduce external discharge, protect groundwater resources, The effect of reducing the impact

Pending Publication Date: 2021-06-22
中国煤炭地质总局勘查研究总院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main water hazard in the Jurassic coalfields in the west is the sandstone pore water of the Cretaceous Zhidan Group on the roof of the coal seam. This type has two characteristics. One is that the aquifer is rich in water and the pores are relatively uniform. technology, will create a huge economic burden
Second, the sandstone of the Cretaceous Zhidan Group has high porosity, but the pores are mainly micro-pores. The pore size of a single pore is very small, and it is difficult to achieve the ideal effect by conventional grouting. ideal governance

Method used

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  • Treatment method for top plate sandstone water of Jurassic coal field
  • Treatment method for top plate sandstone water of Jurassic coal field
  • Treatment method for top plate sandstone water of Jurassic coal field

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Embodiment 1

[0038] This embodiment relates to a method for controlling sandstone water on the roof of a Jurassic coalfield, comprising the following steps (the flow chart is as follows: image 3 ):

[0039] The first step is to take the mining area as the control area and arrange ground drilling around the mining area. The boreholes are located 50m outside the boundary of the affected area of ​​coal seam mining. The boreholes are arranged in a single ring with a distance of 30m (the schematic diagram is shown in figure 1 ).

[0040] The second step is drilling. The drilling is a three-hole structure, the first hole diameter is 219mm, entering the bedrock 10m, the second hole diameter is 168mm, and the 127mm casing is lowered, the depth is 480m, and the horizon is 10m above the grouting section. The diameter of the third hole is 110mm, which is an open hole, and the depth of the final hole is 600m. The layer of the final hole is the sandstone aquifer of the Luohe Formation, which is the...

Embodiment 2

[0047] This embodiment relates to a treatment method for roof sandstone water in a Jurassic coalfield. Compared with Example 1, the difference lies in that in the first step, the mining area is taken as the control range, and ground boreholes are arranged around the mining area. The boreholes are located 50m outside the control boundary, and the boreholes are arranged in a multi-ring manner around the mining area, and the adjacent ring-shaped distribution grouting holes are designed in a staggered manner (the schematic diagram is shown in figure 2 ).

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Abstract

The invention belongs to the field of mine water treatment, and particularly relates to a treatment method for top plate sandstone water of a Jurassic coal field. The method comprises the steps that overground grouting holes are constructed in the periphery of a working face or a mining area, and grouting is conducted in the grouting holes; and the working face or the mining area serves as the center, and the grouting holes are annularly distributed around the working face or the mining area. According to the treatment method, a channel for underground water to flow into a mine is blocked from the source, the underground water is sealed in a stratum, the influence of coal mining on the underground water is reduced, accordingly, the inflow amount of the mine water is reduced, and the underground water resource is protected.

Description

technical field [0001] The invention belongs to the field of mine water treatment, and in particular relates to a treatment method for sandstone water on the roof of a Jurassic coal field. Background technique [0002] Mine water in the Jurassic coal mining area in western my country has significant characteristics of large volume and high salinity. At present, the prevention and control of mine water in this area is mainly based on "mine water drainage", but the effect is not obvious. Moreover, although the "mine water drainage" technology has played a certain role in mine safety, it has seriously damaged groundwater resources and the ecological environment, and the mine water after drainage still faces the problem of disposal. [0003] In the existing technology, there is grouting technology in the process of treating mine water, but this technology focuses on the treatment of limestone water in the coal seam floor, and is suitable for the treatment of fissure water or kar...

Claims

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Application Information

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IPC IPC(8): E21C41/18E21D11/38E21D11/10
CPCE21C41/18E21D11/38E21D11/10
Inventor 吴铁卫
Owner 中国煤炭地质总局勘查研究总院
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