Downward short anchor cable continuous, multi-layer pre-support method

Abstract

The present invention is a continuous and multi-layer pre-supporting method with downward short anchor cables. Starting from the second layer, the following pre-supporting operation is carried out after the one-step mining and slitting is completed: first, along the one-step mining and slitting, the upper position of the two sides of the bottom plate is Excavate a downwardly inclined drilling hole, then install the supporting threaded steel in the borehole and pour cement slurry, and then use the same rooting threaded steel to connect the tails of the supporting threaded steel in the same one-step mining section together, and then Carry out stope cement filling operations. After the two-step mining operation is completed, the tailings are filled. The method implements advanced, continuous and multi-layer support for the mining body, and can completely cure the roof caving of the stope.

Description

technical field [0001] The invention relates to a roof support technology for underground mining stope pressure management of metal mines. Background technique [0002] At present, there are mainly the following methods for the roof support technology of underground metal deposit mining stope pressure management at home and abroad: [0003] The first method is roof pre-support before stope recovery. Use upward long anchor cables for pre-support. Supporting principle: The long anchor cable (rebar) is poured with cement slurry to form a whole with the ore rock. While strengthening the surrounding rock, it also plays a role in lifting and supporting the bottom ore rock. Supporting equipment and materials: YGZ90 guide rail rotary rock drill, single-cylinder grouting pump, screw steel, cement, accelerator, return air pipe, etc. Supporting process: rock drilling - installation of rebar, return air pipe - sealing - grouting - return air pipe overflow. Advantages: The support st...

AI Technical Summary

Problems solved by technology

Existing problems: complex support process, low efficiency, high cost, easy to fall off during support; support equipment is large, stope support cannot be completed under a small section, and the support operation itself is unsafe when the stope exposed area is large; The anchor cable has not taken root and is easy to fall off later

Existing problems: the support range is small, the support effect on broken and soft rock mass is poor, it is easy to fall off when impacted by blasting, and the support operation is unsafe

Existing problems: small support range, unsafe support operation

Advantages and disadvantages: the support process is simple but the construction is difficult; the support range is small, not suitable for broken rock and soft rock, and the support operation is unsafe

Disadvantage: It is difficult to recover the ore pillar, which will eventually cause a large loss of ore

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