Method for blocking high stress in upper part of ore body by using pressure relief groove

Abstract

The invention discloses a method for blocking high stress in the upper part of an ore body by using a pressure relief groove, and is suitable for the technical field of deep mining. The method includes step (1) of determining pressure relief boundaries of upper and lower rock formations according to the rock formation movement range; step (2) of arranging rock drilling roadways respectively on theouter sides of the upper and lower top side pressure relief boundaries of the ore body along the trend, and causing upper and lower rock drilling roadways to be on the same horizontal line; step (3)of respectively horizontally forming a plurality of drilled holes in the sides of the upper and lower rock drilling roadways close to the ore body, and causing each drilled hole to be axially perpendicular to the side wall of the rock drilling roadway; step (4) of performing in-hole explosion in each drilled hole, and forming the continuous pressure relief groove in the upper portion of the ore body. By pre-tunneling the roadway at the top side of the ore body and drilling the top drill holes and carrying out in-hole explosion, the continuous pressure relief groove is formed at the top of theore body, the overlaying strata gravity stress is blocked off, and the pressure relief mining of the ore body in the high stress environment is achieved.

Description

Technical field [0001] The invention belongs to the technical field of deep mining, and in particular relates to a method for using a pressure relief groove to block high stress on the upper part of an ore body, and is particularly suitable for pressure relief mining of a steeply inclined ore body under a high stress environment. Background technique [0002] With the increasing demand for mineral resources from social development, large-scale deep mineral resource development has become an inevitable trend in the development of the mining industry. As the buried depth of the ore body increases, the level of in-situ stress increases, and the possibility of large-scale roof collapse and high-intensity rock bursts in ore body mining is increasing. Therefore, it is necessary to effectively relieve the pressure of the ore body under the high stress environment to ensure the safe and efficient mining of the deep ore body. [0003] For rock formations in high-stress areas, the commonly ...

AI Technical Summary

Problems solved by technology

However, this method has great damage to the surrounding rock of the hanging wall, and it is easy to cause large-scale collapse of the stope roof when the ore body is mined, which increases the ore dilution rate and easily induces roof fall accidents

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