Decision method for proportional ratio of mixed aggregate filling slurry for mining

Abstract

The invention discloses a decision method for a proportional ratio of mixed aggregate filling slurry for mining. The decision method comprises the following steps of testing the packing density of the mixed aggregate, drawing a relationship curve between the packing density of the mixed aggregate and the proportional ratio of coarse and fine aggregates, and obtaining the proportional ratio of coarse and fine aggregates corresponding to the maximum packing density; performing orthogonal test on the strength of a cementing filling body using different usage amounts and mass concentrations of gel materials, and orthogonal test of slump, fluidity, delaminating degree and bleeding rate of the filling slurry, establishing a function relationship between the strength of the cementing filling body, the conveying characteristic parameter of a filling slurry pipeline, and the usage amount and mass concentration of the gel material, and establishing a decision model of the proportional ratio of the mixed aggregate filling slurry by using the cost of the filling slurry material as a decision goal, using the design strength of the cementing filling body and using the critical value of conveying or pumping characteristic parameter of the filling slurry pipeline as constraint conditions; solving the decision model, so as to obtain the usage amount and mass concentration of the gel material. The decision method has the advantages that the cost of filling mining is greatly reduced, and the discharge of solid wastes is reduced.

Description

technical field [0001] The invention relates to the field of filling mining, in particular to a decision-making method for proportioning filling slurry with waste rock coarse aggregate for mining. Background technique [0002] The filling method mining can backfill waste rocks, waste residues, waste water, tailings and other wastes into the underground goaf, which can not only effectively control the stope pressure, surface subsidence and rock formation movement, but also reduce waste piles and realize waste-free mining. Or the development and comprehensive utilization of green resources with less waste, so as to protect the environment and control geological disasters. The filling mining method mixes the filling aggregate, cementitious material and water according to a certain ratio and evenly stirs to prepare a filling slurry that meets the design strength of the mine filling body and pipeline transportation conditions, and transports it to the mine through filling pipelin...

AI Technical Summary

Problems solved by technology

[0003] Engineering practice shows that there is a technical problem of delamination and segregation in waste rock coarse aggregate filling slurry, which leads to plugging and bursting of the slurry during pipeline transportation; delamination and segregation of the slurry also causes uneven strength of the cemented filling body, reducing the strength of the cemented filling. body strength and overall stability; at the same time, the fluidity of filling slurry becomes poor, resulting in low filling roof connection rate, potential filling stope roof settlement, surface rock movement and even subsidence and other geological disasters

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