Overall long anchor cable pre-supporting method for hanging wall broken ore body

Abstract

The invention discloses an overall long anchor cable pre-supporting method for a hanging wall broken ore body. The overall long anchor cable pre-supporting method for the hanging wall broken ore body comprises the steps of excavating a hanging wall surrounding rock broken zone along a rock drilling transverse roadway at the lower part of each segmented ore body to parallelly excavate two outside-vein roadways, and excavating anchor cable fixing roadways along the trends of the ore bodies; then arranging steel beams in the anchor cable fixing roadways; then, drilling anchor cable drill holes upwards in the ore body along the edge of the inclined ore body in the rock drilling transverse roadway on the lower part of each segmented ore body, arranging long anchor cables in the anchor cable drill holes in a penetrating mode, and fixing the long anchor cables to the steel beams of anchor cable fixing roadways; and finally, grouting in the anchor cable drill holes. The long anchor cables and the hanging wall rock body are stressed together through a ground anchor, an inclined thick and large ore body hanging wall with broken surrounding rock is reinforced more effectively, and the stoping safety coefficient of a hanging wall triangular ore body is further improved.

Description

technical field [0001] The invention relates to a method for strengthening the surrounding rock of a mine ore body, in particular to an integral pre-support method for long anchor cables of a broken rock body on a hanging wall. Background technique [0002] In the process of mining the inclined thick and large ore body by using the medium and deep hole segmental mining method, if the surrounding rock of the hanging wall of the inclined ore body is not stable, it will lead to poor safety of the stope, making the triangular ore body of the hanging wall It is difficult to mine, which limits the safe, efficient, low-cost, and large-scale mining of inclined thick ore bodies. In view of this problem, methods such as vertical stabilization of inclined ore bodies and reinforcement of hanging wall surrounding rock concrete columns are usually used in engineering practice to reinforce the hanging wall surrounding rock, but these two methods will lead to the loss of part of the hanging...

AI Technical Summary

Problems solved by technology

However, this method provides space for the installation and construction of steel beam anchor cables by extending the outlet chambers at the lower part of each segment towards the hanging wall of the ore body to form extravein chambers. This method is an active support method that requires Drilling and installing anchor cables in the hanging wall rock mass will inevitably cause disturbance to the hanging wall ore body during the implementation process

On the other hand, the parallel arrangement of the steel beams and anchor cables requires a large space for the extra-vein chambers, which increases the amount of excavation and also increases the amount of steel beams and anchor cables, and the extra-vein chambers require additional support engineering, leading to further higher construction costs

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