A method to prevent the roof from being pressed when the working face and the withdrawal channel are connected

Abstract

The invention discloses a method for preventing roof weighting during connection of a working face and a retracement passage, and belongs to the field of mining safety. The length of a roof without weighting during the connection of the retracement passage in an end-mining stage is calculated according to periodic caving step distance of an old roof of the working face and minimum roof control distance of a supporting frame. When the working face is pushed to a main retracement passage, the roof is pre-cracked in advance by means of deep hole blasting to make the roof be broken at a pre-cracking position after the working face is pushed. Then the working face is continuously pushed until the connection of the roof without weighing to ensure safe and rapid retracement of fully mechanized mining equipment. The method for preventing the roof weighting during the connection of the working face and the retracement passage solves the problems that seriously affect safety of the fully mechanized mining equipment and efficient and fast retracement, such as roof subsidence, coal wall rib spalling and serious floor heave of the retracement passage caused by serious roof dynamic pressure during the connection of the retracement passage in the end-mining stage.

Description

technical field [0001] The invention relates to a method for preventing and preventing the roof from pressing when the working face and the withdrawal channel are connected, and in particular to a method for preventing the roof from pressing when the working face and the main withdrawal channel are connected when the fully mechanized mining equipment is withdrawn in the final mining stage of the working face A method, belonging to the field of mining safety. Background technique [0002] In the mine production process, the succession of the working face is a necessary link. The relocation and reverse of the fully mechanized mining face is an important link for the mine to achieve high production and high efficiency. efficiency. With the enlargement of the scale of the mine, the number of fully-mechanized mining face equipment has also increased, and the improvement of production efficiency has continuously increased the retreat frequency of the working face equipment. Yiel...

AI Technical Summary

Problems solved by technology

At present, the more commonly used method is to adjust the mine pressure at the working face at a certain distance from the retracement channel, stop the advance to break the basic roof at a reasonable position, and avoid pressure when the working face is penetrated. However, the method of stopping production and allowing pressure will be It is not easy to choose the location that affects the advancing rate of the working face at the final mining stage and stops mining at the same time

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