Method for hole-by-hole blasting explosion treatment of abandoned mined-out area

Abstract

The invention discloses a method for hole-by-hole blasting explosion treatment of an abandoned mined-out area. The method comprises the steps that the dangerousness of the abandoned mined-out area is evaluated, the range of the abandoned mined-out area and explosion parameters are determined, and the treatment effect of the abandoned mined-out area is evaluated, specifically, the above rock thickness H of the abandoned mined-out area is smaller than or equal to the above rock thickness Hs of the abandoned mined-out area (namely H is smaller than or equal to Hs), the residual gap height of the abandoned mined-out area is larger than or equal to the product of the above rock thicknesses of the abandoned mined-out area and the rock hulking coefficient (namely Hk is larger than or equal to KsH), and explosion treatment needs to be carried out on the above rock of the abandoned mined-out area; according to the step of determining the range of the abandoned mined-out area, milling data are collected, the actual range of the abandoned mined-out area is surveyed and mapped, and drilling inspection is conducted; the hole-by-hole blasting explosion parameters are composed of adjusting hole net parameters, the charging constitution, the connection way and the blasting sequence; and the treatment effect of the abandoned mined-out area is verified by determining whether an expected effect is reached or not through comparison of the actually measured collapse depth with the theoretically calculated collapse depth.

Description

technical field [0001] The invention belongs to a method for treating abandoned goafs, which uses blasting technology to treat abandoned goafs and eliminate geological disasters caused by abandoned goafs. Background technique [0002] The mining of mineral resources leaves "holes" below the surface, and the range and shape of the remaining goaf after mining resources by different mining methods are different. In recent years, the demand for mineral resources in my country has increased, and the mining intensity of mines has increased accordingly. The collapse of the goaf has caused frequent accidents, seriously threatening the personal and property safety of the surrounding residents, and also causing harm to the ecological environment. [0003] On April 19, 2016, the collapse caused by the coal mine in Fangshan District, Beijing (39.9 degrees north latitude, 115.8 degrees east longitude), triggered an earthquake of magnitude 2.7, and no casualties were found; A large-scale ...

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Problems solved by technology

[0003] On April 19, 2016, the collapse caused by the coal mine in Fangshan District, Beijing (39.9 degrees north latitude, 115.8 degrees east longitude), triggered an earthquake of magnitude 2.7, and no casualties were found; A large-scale goaf collapse occurred in the No. 5 coal seam 8117 fully mechanized mining face of the Coal Industry Company, resulting in a storm safety accident, killing 19 people; on January 4, 2015, a coal mine goaf collapse accident occurred in Erdun Village, Mahuangliang Town, Yulin. 2.5-magnitude earthquake; on December 25, 2015, the goaf of the abandoned gypsum mine in Pingyi County, Shandong Province collapsed, triggering a 4.0-magnitude earthquake. A collapse accident occurred in a goaf in Sui County, resulting in the burial of 6 workers

Such as patent (CN102606205A) discloses the in-situ treatment method of underground goaf; There is still a risk of goaf collapse if mining disturbs the pillar or the pillar fails

(3) Caving method, that is, destroying the surrounding rock in the goaf by artificial or natural ground pressure, and inducing part of the surrounding rock in the goaf to collapse and fill the goaf. In this method, the caving of the surrounding rock cannot fully fill the goaf. There is still a risk of goaf collapse

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