Physical and chemical combined roof contact method for stope filling

Abstract

The invention provides a physical and chemical combined roof contact method for stope filling, and belongs to the technical field of filling. The method comprises the following steps of firstly, determining filling process parameters and physical and mechanical property indexes of a filling body according to actual production conditions of a mine, selecting a proper expanding agent type and an appropriate expanding agent addition amount, determining an expanding agent addition mode, and calculating an expansion rate; secondly, establishing a goaf structure model and a three-dimensional rectangular coordinate system according to goaf structure parameters, selecting roof contact rate calculation parameters, and establishing a mathematical model; then determining the number of blanking points and the distance between the two blanking points through comparison of different schemes according to the established roof contact rate mathematical model; and finally, arranging pipelines for filling roof contact. According to the method, a multi-point blanking method (physics) and an expanding agent adding method (chemistry) are fused to form a high-quality and high-efficiency filling roof contact method, the method has the advantages of safety, reliability and low cost and is suitable for roof contact of various mining methods, and the roof contact rate can be controlled and adjusted.

Description

technical field [0001] The invention relates to the technical field of filling, in particular to a material-chemical joint roofing method for stope filling. Background technique [0002] With the continuous development of industry, the demand for mineral resources is gradually increasing. After the underground ore is mined, a large number of gobs are formed, which destroys the stress balance of the original rock and deforms and destroys the surrounding rock. Filling mining is one of the most important technologies in the green mining technology system, which has the dual effects of environmental protection and recovery rate improvement while ensuring safety. Filling roof connection is an important factor affecting stope filling effect. If the effect of filling and roof connection is not good, the exposed area of ​​the stope roof will be too large, and when it reaches or exceeds the maximum exposed area allowed to maintain the stability of the roof, disasters such as roof ca...

AI Technical Summary

Problems solved by technology

However, manual roofing is labor-intensive and low in efficiency; although pressurized pumping filling and roofing efficiency is high, it requires a set of special mortar pressurized pumping facilities, which has great limitations; forced caving and roofing will cause ground damage. Local subsidence, not applicable where the surface needs to be protected

Due to the above disadvantages, it may waste a lot of financial and material resources to achieve high-quality filling and topping, and may not achieve the target filling and topping effect

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