Goaf bag-type packing method

Abstract

The invention discloses a goaf bag-type packing method, comprising the following steps: suspending a plurality of flexible filling bags at intervals in a goaf from an open-off cut, arranging a plurality of individual props at the outer side of a plurality of flexible packing bags, then erecting a formwork supported by the individual props outside the flexible filling bags; filling high-water material seriflux containing more than 85% of moisture into the bags until the bags are full, and removing the framework and the individual props after the high-water material in the bags are consolidated to complete a row of filling cycle. With the propulsion of coal mining working face, the following row of filling work is carried out continuously, flexible filling bags are suspended next to the front row to perform bag suspension and filling circularly of the next cycle until the filling work of the whole goaf is finished. The invention can directly support the top plate of the goaf, thereby effectively reducing the submergence of the top plate and controlling ground surface movement. The bag-type packing method is particularly suitable for filling the goaf of an inclined mining working surface with smaller strike propulsion or coal seam pitch, and has the advantages of simple technology, easy construction, low cost, simple operation and high filling efficiency.

Description

technical field [0001] The invention relates to a bag-type filling method for a goaf, and is especially suitable for filling the goaf after coal mining in "three downs" (under buildings, under water bodies, and under railways). Background technique [0002] For a long time, the "three-down" coal mining has caused serious deformation and damage to the rock formation and surface. The underground water system was destroyed, and a large number of ground buildings could not be used due to serious deformation. Therefore, it is necessary to fill the mined-out area after coal mining to slow down the downward movement of the rock above the mined-out area, so as to achieve the purpose of protecting the surface. [0003] At present, the main methods of goaf filling include gangue filling, water-sand filling, paste and paste-like filling, etc. These filling methods have played a certain role in controlling the subsidence of the ground surface. However, the filling rate of gangue fill...

AI Technical Summary

Problems solved by technology

However, the filling rate of gangue filling and water-sand filling is low, the filling cost is high, and the subsidence control effect on the surface is limited; although the filling rate of paste filling and quasi-paste filling has been improved, the filling process is relatively complicated and requires equipment. The equipment is complex, the initial investment is relatively large, ranging from tens of millions of yuan to hundreds of millions of yuan, and the cost is extremely high, which limits the application and promotion of these two filling methods

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