Mined out space dam-type filling method

Abstract

The invention relates to a mined out space dam-type filling method; after an overhand mining working surface is pushed forward 3-5m, a baffle is arranged behind a cut top row single-body hydraulic support post in a spanning way; flexible waterproof cloth is attached on baffle and is laid and extended towards a bottom plate and two lanes of the working surface, so that a separated mined out space is formed; high-water material is filled into the separated mined out space by grouting equipment; after the high-water material is solidified, the baffle and the single-body hydraulic support post are disassembled, and one-time filling can be finished; along with the advance of a coal mining working surface, the steps are repeatedly carried out for completing the filling for a plurality of times; after the coal mining working surface finishes mining, all devices of the working surface are disassembled, a closed wall is built between a transportation roadway and a track roadway, and finally, top tight filling is carried out to complete the filling operation of the whole mined out space. As a grouting pipe is used for flood irrigation of the separated mined out space, the filling liquid level is lifted, slurry can be in top tight filling rapidly, filling is dense, the effect is visualized, and the method is simple. Therefore, the mined out space dam-type filling method is applicable to the overhand mining working surface with smaller coal seam dip angle or higher mining height.

Description

technical field [0001] The invention relates to a dam-type filling method for goafs, which is suitable for filling goafs under buildings, under water bodies, under railways and on water bodies after coal mining, and is mainly used in elevations with small coal seam dips or high mining heights. mining face. Background technique [0002] For a long time, coal mining under buildings, under water bodies, under railways, and above water bodies has caused deformation and damage to the overlying rock strata and the surface, causing damage to the groundwater system, and damage and deformation of ground buildings that make them unusable. Therefore, it is necessary to fill the mined-out area after coal mining to slow down the movement of the overlying strata in the mined-out area, so as to achieve the purpose of protecting the surface. [0003] At present, the main goaf filling methods include gangue filling, water-sand filling, paste filling, paste-like filling and high-water materi...

AI Technical Summary

Problems solved by technology

Although these filling methods can all play a role in controlling surface subsidence, due to the low filling efficiency and high filling cost of gangue filling and water-sand filling, their effect on controlling surface subsidence is limited.

Paste and paste-like filling processes are complicated, with a large investment of tens of millions of yuan, and conventional high-water filling materials can only be filled when the coal seam dip angle α is greater than 12°, the mining height is small, and the overlying rock is relatively stable. Applicable under good conditions

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