Steep-dip ultra-thick coalbed mining technique based on top-coal advancing pre-detonation weakening

Abstract

The invention discloses a steep-dip ultra-thick coalbed mining technique based on top-coal advancing pre-detonation weakening. The steep-dip ultra-thick coalbed mining technique includes exploiting steep-dip ultra-thick coalbed from back to front along coalbed bearing in several exploiting periods. In one of the exploiting period, the steps include firstly, constructing a roadway; secondly, weakening top-coal advancing pre-detonation, to be specifically, 201, determining a coalbed to be detonated; 202, drilling blast holes from an intake airflow road by a drilling machine; 203, charging and sealing the blast holes; 204, detonating for the first time; 205, detonating for the second time; thirdly, exploiting the coalbed; fourthly starting the next exploiting period; repeating the fourth step for many times until the steep-dip ultra-thick coalbed is completely exploited. The steep-dip ultra-thick coalbed mining technique is simple in steps, reasonable in design, high in exploitation efficiency and working-face recovery ratio, and good in using effect, and the problem that an existing mining technique is complicated, low in working-face recovery ratio and low in exploitation efficiency and causes many potential safety hazards is solved.

Description

technical field [0001] The invention relates to a coal mining process, in particular to a coal mining process for a steeply inclined extra-thick coal seam based on the weakening of top coal advance pre-explosion. Background technique [0002] The top-coal caving mining method is to arrange a coal mining face with a mining height of 2m to 3m along the floor of the coal seam or the bottom of a certain thickness range of the coal seam when mining a thick coal seam. After the top coal is broken into loose bodies, it is discharged from the "coal discharge window" behind or above the support, and is transported out of the working face by a scraper conveyor. combine Picture 1-1 and Figure 1-2 , at present, when mining steeply inclined extra-thick coal seams (coal seams with a coal seam dip angle of more than 45° and a coal seam thickness of more than 8m), the coal mining technology adopted is as follows: First, the production of the coal mining face 1-1 is stopped, and the rock ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a coal mining process for steeply inclined and extra-thick coal seams based on the weakening of top-coal advance pre-explosion, which has simple process steps, reasonable design, high mining efficiency, and The face recovery rate is high and the use effect is good, which can solve the problems existing in the existing coal mining technology such as complex process, low recovery rate of the working face, many safety hazards, and low mining efficiency.

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