A kind of upward slurry column method grouting and top filling method

Abstract

The invention discloses an upward grouting column grouting filling method and belongs to the technical field of coal mine mining. The core of this filling method is that the grouting position is located in the mining roadway of the coal seam floor. On the basis of controlling the flow range, by adding accelerators or retarders, the self-solidification and diffusion properties of the slurry are used to achieve pipeless upward grouting. Effect. The invention simulates the process of volcanic eruption and accumulation, the first grouting material controls the grouting amount, diffuses and condenses on the bottom plate of the coal seam, and does not add accelerator in the last few minutes of the first grouting, so that the middle part of the first grouting accumulation is retarded material; Provide channels for the secondary grouting; stop the pump for 1‑60 minutes, and perform the secondary grouting. The secondary grouting material will accumulate and spread on the upper part of the first layer of grouting material, and maintain the same degree of diffusion; repeat the above operation, the slurry will form layers and gradually rise, through the above operation process, the filling height of the slurry can be reached without template In the case of the automatic rise effect.

Description

technical field [0001] The invention relates to the technical field of coal mine mining, in particular to an upward grouting column grouting filling method. Background technique [0002] At present, coal mine filling methods mainly include three major categories and five subcategories. The three categories are: 1. Roof separation layer grouting filling; 2. Goaf solid filling; 3. Goaf slurry filling. [0003] Roof separation grouting refers to the drilling from the ground to the roof of the coal seam. After the coal mine is mined, it will form a caving zone, a separation zone and a curved subsidence zone. Surface subsidence can be controlled by injecting grout into the abscission layer. But there is following shortcoming, 1, if coal mine burial depth is bigger, then borehole depth increases greatly, and needs to arrange borehole with certain network degree, and investment is huge. 2. The abscission zone is connected with the caving zone, and grouting to the abscission zone...

AI Technical Summary

Problems solved by technology

But there are following disadvantages, 1, if the buried depth of the coal mine is large, the drilling depth will be greatly increased, and the drilling needs to be arranged with a certain mesh degree, and the investment is huge

2. The abscission zone is connected with the caving zone, and grouting to the abscission zone will inevitably lead to the fluidity slurry flowing down to the caving zone under the action of gravity, so the amount of grouting cannot be controlled, resulting in technical and economic impossibility

This technology has the following disadvantages: 1. The waste rock transportation volume is large, and it affects normal production and transportation

2. The working face needs to stop advancing and leave the special waste rock top compaction operation time, which affects production; 3. The solid filling does not add cementitious materials, and its strength is low, and it will still fall under the huge pressure of the upper hundreds of meters thick rock formation. Shen, less control over the surface

The bag-type filling has a good top connection rate and high strength, but it seriously affects the production progress. It takes time for the bag to be filled, and it takes time for the slurry to solidify; the floor buried pipe paste filling cannot be connected to the top because the pipeline is arranged at the bottom, and the injection must be controlled. The flow range of the slurry prevents the slurry from running to the working face, so the efficiency is low and the roof cannot be effectively supported

[0006] The key to restricting gob filling is that the inside of the gob is loose, broken and unstable rock mass, the drilling hole is easy to collapse, and the movement of large loose rocks will easily cause the grouting pipe to break and grouting cannot be done, so the traditional rock mass cannot be used. Roof filling by grouting in middle borehole

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