Method for treating water-absorbing heaving floor of bottom plate of coal mining roadway

Abstract

The invention, which relates to the field of mine hydrogeology, discloses a method for treating a water-absorbing heaving floor of a bottom plate of a coal mining roadway. The method comprises the following steps: step one, observing a heaving floor of a bottom plate of a roadway to obtain a maximum height h of the heaving floor and a coordinate of the plane at which the maximum height is located;step two, carrying out slip casting and hole drilling on two bottom corners of the bottom plate the roadway; step three, carrying out slip casting reinforcement through the slip-casting drilling hole; step four, carrying out water-drawing hole drilling on the bottom plate the roadway and arranging a water pumping pipe and a floral tube in the water-drawing hole; step five, arranging sensors at the top plate and two sides of the roadway; step six, laying a vacuum pumping system on the bottom plate the roadway; step seven, starting the vacuum pumping system; step eight, stopping water pumping after reaching a water-drawing stopping standard; step nine, filling sedimentation, caused by the water pumping, of the bottom plate the roadway; and step ten, at coal mine tunneling and exploitation stages, repeating the steps from the step six to the step nine until scrap of the roadway under the condition of reaching the h by the height of the heaving floor. According to the invention, vacuum water pumping is carried out on the heaving floor, so that the water-absorbing expansion is eliminated.

Description

technical field [0001] The invention relates to the field of mine hydrogeology, intersects with the field of mining, and in particular relates to a treatment method for a water-absorbing floor drum of a coal mining roadway floor. Background technique [0002] Roadway excavation is required before coal mine mining. During some roadway excavation, floor heaves may occur on the floor due to minerals that absorb water and expand. The working conditions after the bottom of the bottom plate become worse, and some even affect the production of coal mines, vehicles cannot pass through, and the stability of surrounding rock is affected. For roadway floor heaves, the most commonly used methods are to lift the floor, or use different types of support to resist the pressure of surrounding rock or to replace and modify the floor material. These methods have the following problems: [0003] 1) After the floor is lifted, it will play a good role in a short period of time, but after a per...

AI Technical Summary

Problems solved by technology

[0003] 1) After the floor is lifted, it will play a good role in a short period of time, but after a period of time, the floor will bulge again, and the surrounding rock environment will further deteriorate after the second floor bulge, so lifting the floor is a method to treat symptoms but not the root cause

[0004] 2) Different support methods are often aimed at the environment with relatively large mine pressure, and the bottom plate will continue to expand after absorbing water, and the support pressure will continue to change, resulting in high cost and technical requirements

[0005] 3) Replacing or modifying the bottom plate material can eradicate the influence of water absorption and swelling. In this way, the construction period is long, the construction scope is large, and the construction cost is high

The process of replacement or modification involves excavation, which may cause pressure imbalance in surrounding rock

Small pores and cracks, so the overall sealing performance is poor after cement plugging, which is easy to cause hydrogen sulfide to escape

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