Gob expanding material prestressed filling method and prestressed filling material

Abstract

The invention relates to the field of mining. A gob expanding material prestressed filling method is characterized by comprising the following steps of (1) preparing a prestressed filling material, i.e. stirring and blending the following raw materials in percentage by mass, 20 to 80 percent of burnt lime powder, 20 to 50 percent of water, 0 to 60 percent of filling aggregate and 0 to 5 percent of additive, to obtain the prestressed filling material; (2) according to the actual needs of a mine, on the basis that all the prestressed filling material or a part of filling material which is originally used by the mine is filled into a gob, filling the prestressed filling material into the gob through a filling pipe until the prestressed filling material reaches the top of the gob. After the prestressed filling material enters the gob for a certain time, the volume of the prestressed filling material is expanded; after the whole gob is fully filled, the prestressed filling material applies certain pre-stress to the surrounding rock mass. The problem that the mine is difficultly filled to the top is solved by the method and the filling material, the deformation and displacement of the surrounding rock mass are fully restrained, the stress distribution of the surrounding rock is improved, and a good condition for deep mining and the mining in a complex ground stress environment is also created.

Description

technical field [0001] The invention relates to the field of mining, in particular to a method for prestressed filling of an expansive material in a goaf and a prestressed filling material thereof. Background technique [0002] After the underground mineral resources are extracted, the original stress balance state of the rock mass around the mining area is destroyed, and the stress is redistributed to achieve a new balance. The destruction of cultivated land, railways, bridges, etc. has caused huge adverse effects on the natural environment and ecological environment on the surface. In recent years, with the improvement of people's environmental protection concept, a series of problems caused by surface subsidence caused by underground mining have been widely concerned. At present, the technical measures to reduce the deformation of the overlying rock and the subsidence of the surface mainly include the method of retaining protective pillars, the partial mining method, the...

AI Technical Summary

Problems solved by technology

[0005] Nowadays, with the rapid development of our country's economy, the demand for mineral resources is increasing. However, after years of mining, the easy-to-mine resources on the surface are almost exhausted. People's eyes have to turn to deeper underground or some difficult-to-use ore bodies. Due to insufficient filling It is difficult for people to effectively control the displacement and deformation of the rock mass around the ore body. How to scientifically and effectively solve the problem of filling and roofing is a problem faced by mining workers in my country.

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