High-early-strength low-expansibility filling material and filling method thereof

Abstract

The invention discloses a high-early-strength low-expansibility filling material and a filling method thereof. The filling material comprises a matrix component and an admixture component; the matrixcomponent comprises an inert material, a cementing material and water; the admixture component comprises, by mass of the inert material, 3-10% of a foaming agent, 3-5% of a foam stabilizing agent and0.1-0.8% of a retarder. The high-early-strength low-expansibility filling material has advantages of high fluidity, long initial setting time, high early strength and low expansibility, the expansionrate is 20-50%, a high tight-filling ratio of 100% can be realized in application to mining filling, and effective support for roofs of goafs or roadways can be formed.

Description

technical field [0001] The invention relates to an early-strength and weak-expansion filling material and a filling method thereof, which are suitable for filling and mining in mines, especially metal mines, and belong to the technical field of mine and underground engineering safety. Background technique [0002] The development of mineral resources is an important part of the advancement and development of human society, and it plays an important role in promoting the development of human society and the progress of civilization. In recent years, geological disasters have occurred frequently due to the mining of underground mineral resources, among which disasters such as surface subsidence, ground collapse, rockburst, and rock caving (roof caving) have become increasingly prominent, seriously affecting social and economic development. The filling mining method uses artificially formed filling bodies to effectively control the ground pressure, which is used to limit the co...

AI Technical Summary

Problems solved by technology

However, most of the new technologies or methods only emphasize the technical and economic indicators such as the cost and strength of the filling body, but there are not many discussions and insufficient research on how the filling body can effectively exert its superiority in ground pressure control, such as roadway or mining Difficulty in empty space filling and roof connection, which has always been a problem that is difficult to realize theoretically and technically

If the filling body and the roof cannot be connected tightly, no matter how high the strength of the filling body is, no matter how good the technical performance is, it will not be able to play its due role. In production practice, if the problem of filling and roof connection is not considered, it is likely to cause unintended consequences

For example, in some metal mines, because the roadway or goaf is not connected to the top when filling, it causes frequent ground pressure activities, surrounding rock movement, and the occurrence of slabs and caving, which brings great difficulties to the safe production of mines. In the underground mines mined in the middle section, due to the failure of the gob to be connected to the roof, the construction of the mining and cutting engineering is difficult, the loss of ore is serious, and the safety of the mine production operation is threatened. However, remedial measures such as supplementary roofing after the event , not only increases the filling cost, but also weakens the function of the filling body, which reduces the production efficiency of the mine