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Coal pillar test piece coring and sampling method under strong brine soaking effect

A technology of concentrated brine and coal pillar, applied in the field of coal mining, can solve problems such as coal pillar damage

Pending Publication Date: 2022-03-01
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is no damage research on the internal structure of the coal pillar in the existing technology, which is the key to evaluating the durability and long-term stability of the coal pillar dam of the underground reservoir

Method used

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  • Coal pillar test piece coring and sampling method under strong brine soaking effect
  • Coal pillar test piece coring and sampling method under strong brine soaking effect
  • Coal pillar test piece coring and sampling method under strong brine soaking effect

Examples

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specific example

[0032] This example is a specific example of a coal column test piece under a concentrated salt water soaking action, including the following steps:

[0033] (1) Removal salt water soaking coal column test: Remove intact coal blocks that are not submerged from concentrated salt water from the project site, the coal block cutting is machined into a cube coal column test piece with a size of 1000 mm × 1000 mm × 700 mm, after processing The top surface, bottom surface and two non-adjacent sides are applied to the top surface, the bottom surface and the two non-adjacent sides, retain two opposing side as the free surface, and completely soak the coal column test piece in the preformed concentrated salt solution ( In NaCl solution in concentration of 0.1 mol / L, keep indoor constant temperature, simulated natural environment soaking, soaking test period is 180 days;

[0034] (2) Sampling point mark: After the soaking test period is reached, the coal column test piece is removed from t...

Embodiment 2

[0040] This example is a specific example of a coal column test piece under a concentrated salt water soaking action, including the following steps:

[0041] (1) Removal salt water soaking coal column test: Remove intact coal blocks that are not submerged from concentrated salt water from the project site, the coal block cutting is machined into a cube coal column test piece with a size of 1000 mm × 1000 mm × 700 mm, after processing The top surface, bottom surface and two non-adjacent side surfaces are applied to the epoxy resin seal, retain two opposing side as a free surface, and completely soak the coal column test in the preformed concentrated salt solution. Keep indoors constant temperature, soaking out after 3 days, then naturally dried for 3 days, this is a cycle, then soaking it for 3 days after drying for 3 days, so recycled the soaking environment of the simulated dry and wet cycle, soaking the test period of 90 days ;

[0042] (2) Sampling point mark: After the soaking...

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Abstract

The invention discloses a coal pillar test piece coring and sampling method under strong brine soaking action, which comprises the following steps: 1) coating other surfaces except two parallel side surfaces of a coal pillar test piece with a sealing layer, and soaking the coal pillar test piece in strong brine; 2) marking a plurality of drilling coring positions and coal rock powder drilling points on the top surface of the coal pillar test piece, and determining the depth of each drilling; (3) drilling at the drilling and coring position, and taking out a coal rock core; 4) drilling coal rock powder at the coal rock powder drilling point, and collecting the coal rock powder of each layer in the vertical sampling depth; 5) processing the coal rock core into a standard sample; and (6) measuring the chloride ion concentration in each layer of coal rock powder sample, and drawing a chloride ion concentration distribution diagram of the coal pillar test piece soaked in the strong brine by combining the drilling coring positions and the space coordinates of the drilling points of each layer of coal rock powder. According to the method, coal and rock mass standard test pieces at different positions of the coal pillar soaked in the strong brine can be obtained through an indoor simulation test, and diffusion distribution of chloride ions in the strong brine in the coal pillar test pieces can be measured.

Description

Technical field [0001] The present invention belongs to the field of coal mine mining, and in particular, the present invention relates to a coal column test piece under a concentrated salt water soaking. Background technique [0002] Safety coal columns or waterproof coal processes retained after coal mines can be used as a permanent hydraulic structure to build underground reservoirs, which is conducive to the development of coal resource development and water resources protection. However, clay minerals, square alficitones, sulfides, hydroxides, sulfate minerals, etc. in the coal proximal, such as the long-term soaking environment of high concentration saline solution, causing chemical damage degradation of microstructure in the internal microstructure of the coal proximal. The long-term reliability and safety of the coal pillar dam body are significantly reduced. [0003] CN201910929476.6 Provides a test method of coal columns under non-uniform distribution conditions under n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/08G01N1/28G01N33/22
CPCG01N1/08G01N1/286G01N33/222G01N2001/2873
Inventor 郭奇峰潘继良汪敏张英张杰
Owner CHNA ENERGY INVESTMENT CORP LTD
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