A supporting bearing method for arch suspension bridges in underground mines

Abstract

The invention provides an underground mine arch suspending bridge supporting bearing method and belongs to the technical field of underground mine horizontal ore block top plate supporting methods. The underground mine arch suspending bridge supporting bearing method is used for supporting of underground mine large-scale first-mining horizontal ore block top plates. According to the technical scheme of the underground mine arch suspending bridge supporting bearing method, through formulas, the internal force value of an arch suspending bridge bearing supporting system, the arrangement positions of grouting anchor cables and the length values of the grouting anchor cables are calculated; through a drilling chamber on the upper portion of a stope room, grouting hollow anchor rods are hit into chamber top plates to form superficial layer small arch compression areas of all the stope room top plates so as to bear the self weight of a large arch lower covering rock layer; the grouting anchor cables are hit into the drilling chamber top plates of the stope room to form a deep suspension mechanism, and the self weight of the large arch lower covering rock layer is distributed to a large-span irreversible three-hinged arch structure; grouting anchor rods are horizontally or slightly obliquely hit into the drilling chambers of the stope rooms of the hanging side and the heading side of an ore body to improve the large-span three-hinged arch arching foot bearing capacity; and the grouting anchor rods and the grouting anchor cables are reinforced. According to the underground mine arch suspending bridge supporting bearing method, the effect that the suspending bridge supporting method improves stability of an ore block top plate rock layer is achieved.

Description

technical field

[0001] The invention relates to a method for supporting and bearing the roof of a large-scale first-mined horizontal ore block in an underground mine, and belongs to the technical field of methods for supporting the roof of the horizontal ore block in an underground mine. Background technique

[0002] With the rapid development of the iron and steel industry, the demand for iron ore in the iron and steel industry is increasing day by day. In addition to importing a large amount of iron ore, it is imperative for metallurgical and mining enterprises to conduct large-scale mining of underground mines. At present, there are numerous technical problems that must be solved for large-scale underground mining. Among them, underground mines with steeply inclined thick or extremely thick ore bodies are especially suitable for large-scale mining, because the ore houses in the ore block are arranged vertically to the ore body, and multiple mine houses are formed (the ore...

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