Side filling material of road retained for next sublevel

Abstract

Filling material for sides of a roadway driven along goaf is characterized by having cement, fly ash, stone, sand, water and compound addictive, wherein the compound addictive consists of water reducing agent, water retaining agent, air-entraining agent and hardening accelerator. The material described in the present invention is obtained through mixing and preparaten at a prescribed rate and satisfies long-distance delivery and construction; the material has good load bearing and deformation performance following hardening and the formed filling structure can control a delamination of direct roof and cut off the connection between direct roof and lower basic roof in a timely manner, which allows the an establishment of relatively compact filling in the goaf and minimizing bending and settlement of the basic roof, thereby reducing loads applied on the roadway support and deformation of enclosure with a view to the roadway stability; also the goaf can be sealed timely to avoid ventilation leakage and coal self-ignition and prevent hazardous gases entering into the working room from the goaf.

Description

technical field [0001] The invention relates to a filling material used in underground coal mines to support sideways of retained lanes. Background technique [0002] Anhui Huainan Mining Area is located in the hinterland of East China and is an important coal energy base in my country. The proven coal seams are all soft, low-permeability and high-gas coal seams, with gas reserves of 592.8 billion m 3 . [0003] Gobside retaining is a major reform of coal mining technology. It is of great significance to improve coal recovery rate, reduce excavation rate, relieve the tension of excavation replacement, and improve mine economic benefits. The alley retention along the gob is the basis and premise of realizing Y-shaped ventilation. As the gob-side retaining roadway has to be strongly affected by two mining operations, the surrounding rock of the roadway is highly active, and roadway maintenance is difficult. In addition to the reasonable setting of roadway support, the suppo...

AI Technical Summary

Problems solved by technology

[0005] 2. With the advancement of the mining face, the old roof will inevitably break and become unstable in turn. At this time, the support resistance of the roadside filling body should reach the roof cutting resistance

[0007] 4. From the perspective of the rigidity matching of the media on both sides of the left roadway, one side of the roadway is a coal body with a certain shrinkable elastic-plastic medium, and the other side is the roadside filling belt. If the shrinkage is small or basically rigid, it will cause uneven roof sinking, which is not good for roadway maintenance

[0008] However, so far, there is no filling material with the above properties

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