Improved method of abandoned roadway pumping pillar supporting in area affected by overconcentrated coal pillars

Abstract

The invention discloses an improved method of abandoned roadway pumping pillar supporting in an area affected by overconcentrated coal pillars. The improved method includes the steps that a predetermined amount of mineral fibers are added into an inorganic material to form a mixed raw material in advance; then bag hanging and mold supporting are conducted in the to-be-supported area; and finally,water and the mixed raw material are injected into a mold bag through a pump to form an abandoned roadway pillar. Since the mineral fibers are added into the inorganic material in advance, the inorganic material containing the mineral fibers is directly usedin actual grouting, and thus the toughness of the final formed abandoned roadway pillar, that is the softness is increased.The higher the toughness of the pillar, the less the possibility of brittle fracture in the process of compression bearing. When the working face is pressed, that is under the dynamic load action, the abandoned roadwaypillar can absorb more energy without causing damage, that is pressedexplosion. Therefore, by applying the manufacturing method, the problem that the abandoned roadway pillar is subjected to 'pressedexplosion' due to the dynamic loadaction can be solved, and thus the bearing capacity of the abandoned roadway pillar to an abandoned roadway top plate can be ensured.

Description

technical field [0001] The present application relates to the field of coal mine goaf support, in particular to an improved method for goaf pumping prop support in an area affected by concentrated coal pillars. Background technique [0002] For empty roadway control, pumping pillars are generally used abroad for support. After the technology was popularized and applied in the Shendong mining area, very good results have been achieved. However, in the gob area affected by the overlying coal pillars, when the working face passes through the gob, the pumping pillars will be "compressed and exploded", thus losing the ability to continue to carry the gob roof. [0003] It can be seen that how to avoid the problem of how to prevent the pumping pillar from being "compressed" due to the dynamic load, and then lose the bearing capacity of the goaf roof is an urgent problem to be solved by those skilled in the art. Contents of the invention [0004] This application provides an imp...

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Problems solved by technology

[0004] This application provides an improved method for supporting the support of goaf pumping pillars in the area affected by concentrated coal pillars, which solves how to avoid the pumping pillars from being "compressed" due to dynamic loads in the prior art, and then lose the support of the goaf roof. The problem of carrying capacity

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