Method for processing large-scale underground goaf

Abstract

The invention provides a method for processing a large-scale underground goaf. The method comprises the following steps that: 1, an ultra-deep hole is drilled in a discovered goaf top plate, and the form of a goaf is known in detail through laser three-dimensional scanning; 2, through on-the-spot engineering geological investigation in a mining district and the ore rock mechanical parameter tests, the stability of various kinds of rock bodies is studied, and the safety technical parameters of an open pit mine side slope safety layer under different goaf distribution conditions and rock layer conditions are determined; and 3, for the thicker top plate, layered one-step processing is adopted, and the lower part layer collapses earlier than the upper part layer. Fifteen goafs are processed from the application to the Yuanjia village iron mine of the Tisco (Group) Lan County Mining Company, the processing effect is good, and the potential safety hazards are eliminated. The method has greater guidance significance on the open pit metal mine goaf processing, particularly the goaf processing with the thicker top plate, and the method is worthy of being popularized and applied.

Description

technical field [0001] The invention relates to a method for processing a goaf with a thicker roof in a metal open-pit mine, in particular to a method for filling a goaf with a caving roof by deep hole blasting of open steps. Background technique [0002] At present, most metal open-pit mines in China use the deep hole blasting caving method to deal with the goaf. The purpose of dealing with gobs. The deficiencies are: [0003] 1. The traditional goaf survey technology can only give two-dimensional results, which requires experience to analyze and identify, and is costly, dangerous, labor-intensive and time-consuming. In many cases, it is not practical or feasible; Handling without understanding the cavity shape of the gob will leave hidden dangers to safe production; [0004] 2. The thickness of the security layer on the roof of the goaf is mostly based on the personal experience of the goaf treatment technicians, and there is no security layer security thickness based o...

AI Technical Summary

Problems solved by technology

[0003] 1. The traditional goaf survey technology can only give two-dimensional results, which requires experience to analyze and identify, and is costly, dangerous, labor-intensive and time-consuming. In many cases, it is not practical or feasible; Handling without understanding the cavity shape of the gob will leave hidden dangers to safe production;

[0004] 2. The thickness of the security layer on the roof of the goaf is mostly based on the personal experience of the goaf treatment technicians, and there is no security layer security thickness based on the distribution of the goaf and the rock formation conditions;

[0005] 3. There is no mature thicker roof (thickness is about 30-50 meters) goaf treatment plan and application examples;

[0006] 4. During the construction process, the quality of drilling and hoisting holes is difficult to be guaranteed, and the leakage of explosives is common, seriously affecting the blasting effect and leaving potential safety hazards for future goaf shoveling

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