A kind of main chute plugging method

Abstract

The invention discloses a main draw shaft sealing method. The main draw shaft sealing method comprises the steps that a plunger valve type grouting sealing structure and a follow pipe-prestress anchor cable tie composite rib bi-directional oblique pulling cross structure are adopted, wherein the plunger valve type grouting sealing structure is formed in the mode that original ore of a main draw shaft is replaced with pebble aggregate reasonable in gradation, and cement-water glass slurry pouring is conducted on pebble aggregate loose bodies, and after ore on the lower portion of the main draw shaft is placed downwards, the stable plunger valve type grouting sealing structure with a bottom self-stabilization caving arch is formed finally; the follow pipe-prestress anchor cable tie composite rib bi-directional oblique pulling cross structure is composed of bi-directional opposite-pulling oblique cross follow pipe-prestress anchor cable tie composite ribs. Each follow pipe-prestress anchor cable tie composite rib comprises a follow pipe, slurry overflowing holes and a prestress anchor cable tie. According to the main draw shaft sealing method, the construction period is short, the construction safety is high, the construction cost is low, and the effect that the upper portion of the main draw shaft is stable in a long time, and the using function of the lower portion of the main draw shaft is recovered within the shortest time can be ensured.

Description

technical field [0001] The invention relates to the fields of rock mechanics and mining engineering, in particular to a non-draining main chute plugging method under the influence of geological disasters such as severe collapse and caving of the main chute in an underground mine. Background technique [0002] The main chute of underground mines is the main throat for ore storage, transportation, and restriction of mine production. The section size of the main chute is generally several times larger than that of the stope chute, which is often affected by a series of definite and uncertain factors such as the low quality of early exploration of underground mines, irrational design, long-term production and unloading, and continuous erosion and wear of ore lowering. And lead to the occurrence of large-scale collapse and caving. Severe collapse area can sometimes reach 160m 2 even bigger. How to use reasonable and effective treatment methods according to local conditions to ...

AI Technical Summary

Problems solved by technology

For chutes with large collapse spans and large vertical collapse ranges, the above plugging methods are not operable, and these methods have the disadvantages of unsafe construction personnel, low construction efficiency, long construction period, and secondary failures under the condition that the main chute is empty. Stable collapse and other possibilities, unable to meet the requirements of safe and efficient management of mines

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