Goaf filling method for rock fracture development

Abstract

The invention belongs to the technical field of mining, and particularly relates to a goaf filling method for rock fracture development. According to the invention, full-tailing filling is replaced bytailing grading filling, the fine sand is subjected to secondary stirring and three-stage stirring systems, the fine sand is subjected to pressure filtration to form the agglomerate tailing, the one-time stirring time is short, and the agglomerate cohesion force formed by filter pressing is difficult to damage, the fine sand agglomerate is broken, the secondary stirring time is long, and the crushed agglomerate is long in path length and forms a fine mortar body under the effect of the wrapping and mixing of water, so that the technical problem that the pressed and filtered fine sand agglomerate is hard to form the slurry for filling is solved. The filling scheme provided by the invention is used for filling the goaf of rock fracture development, cracks no longer leak, and the method is safe and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of mining, and in particular relates to a method for filling goafs where rock mass fissures develop. Background technique [0002] The goaf is formed in the ore body due to mining. In order to prevent surface subsidence, eliminate hidden dangers in production, and ensure the safety of workers in the pit, it is necessary to deal with the goaf in a timely and planned manner, such as filling or caving and sealing. On the other hand, during the mining process, the surrounding rocks in the goaf are affected by blasting vibrations, leading to the development of cracks in the rock mass, and even penetrating the ground surface or connecting old kilns with accumulated water, causing water inrush accidents, submerging tunnels and working faces, and causing huge economic losses. After the ore body is mined, the original stress state of the stope is destroyed, which leads to the redistribution of stress, which often lea...

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Problems solved by technology

[0003] In the prior art, it is a relatively economical method to backfill the goaf with tailings after mining, but in practice, when full tailings are used to fill the goaf with developed cracks, the mixing time is short, and it is difficult to fully obtain the tailings and cement. Stir to form a uniform mixture, resulting in serious segregation, water and sand separation, resulting in waste of cement, the formed filling body has low strength, it is difficult to fully mix dry powder cement and water to form a uniform mixed slurry, but contains a large amount of cement wrapped in water Agglomerates, it is difficult to exert the gelling effect of cement, resulting in low overall strength of the filling body and serious leakage, resulting in greater pollution and potential safety hazards

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