LONGWALL MINE CONSTRUCTION METHOD 110

Abstract

A longwall 110 mining method, wherein a haulage dip, an air-return dip and a track dip are provided, a plurality of working faces are arranged in a whole panel, both an upper gateroad and a lower gateroad of each mining face in mining are connected to the haulage dip, and the lower gateroad that retains an entry after the working face is mined is used as an upper gateroad of a next working face, and the lower gateroad of the next working face is connected to the air-return dip. The upper gateroad and the lower gateroad of each working face in mining of the present disclosure are connected to the haulage dip, and the lower gateroad of the working face is connected to the air-return dip.

Description

TECHNICAL FIELD

This disclosure relates to a longwall mining technique in a coal mine, in particular, to a longwall 110 mining method.

BACKGROUND

At present, in the process of longwall mining, a 121 mining method as shown in FIG. 1, that is, one working face needs to excavate two roadways and retains one coal pillar for supporting, is generally used. Specifically, each working face 10 includes an upper gateroad 11, a lower gateroad 12 and a mining face 13. The upper gateroad 11 of the individual working face 10 is connected to a haulage dip 14, and the lower gateroad 12 of the individual working face 10 is connected to an air-return dip 15, in addition, a track dip 16 is also provided. In such structure, the coal pillar needs to be reserved, which causes significant waste of resources. Moreover, it is required to excavate two roadways for each working face, and thereby the work efficiency is low.

In addition, each mining face 13 during mining easily forms ventilation dead point, and presents poor ventilation and low air-flow velocity, it easily results in that toxic and harmful gas can be maintained in the mining face 10, and thereby causing safety risk and even lead to coalmine accidents. As a result of this, it is urgent to improve ventilating effect of the mining face to improve safety of production in the coal mine.

SUMMARY

A longwall 110 mining method, wherein, a haulage dip, an air-return dip and a track dip are provided, a plurality of working faces are arranged in a whole panel, both an upper gateroad and a lower gateroad of each mining face in mining are connected to the haulage dip, and the lower gateroad that retains an entry after the working face is mined is used as an upper gateroad of a next working face, and the lower gateroad of the next working face is connected to the air-return dip.

In an optional embodiment, the upper gateroad and the lower gateroad of the working face in mining are always connected to each other, and connected to the lower gateroad of the next working face.

In an optional embodiment, the upper gateroads of the working face in mining are not retained after accomplishment of mining.

In an optional embodiment, directional roof pre-split cutting is used during the gob-side entry retaining process.

In an optional embodiment, anchor rods sand anchor cables are used for roof support during cutting top for retaining a gob-side entry.

In an optional embodiment, rocks caved from a roof are crushed and expanded for filling a mined-out area to prevent sinking of an upper roof of the lower gateroad.

In an optional embodiment, a top-cutting cantilever beam is used to change distribution laws of surrounding pressure.

BRIEF DESCRIPTION OF THE DRAWINGS

The following detailed description of the present disclosure is taken in conjunction with the accompanying drawings.

FIG. 1 is a schematic view of a longwall 110 mining method in the prior art;

FIG. 2 is a schematic view of the longwall 110 mining method according to one specific application of the present disclosure.

DETAILED DESCRIPTION

Typical embodiments embodying features and advantages of the present disclosure will be set forth in the following description. It is appreciated that the present disclosure may have various modifications in various embodiments, all without departing from scope of the invention, and the description and drawings are regarded to be illustrative in nature and not limit the present disclosure.

A longwall 110 mining method is a novel coal mining method with one working face only corresponds to one roadway, without retaining any coal pillar. Hereinafter, the structure of one embodiment will be explained in details.

The longwall 110 mining method according to the present disclosure in a specific application as shown in FIG. 2, includes a panel and three dips, wherein, the three dips are a haulage dip 24, an air-return dip 25 and a track dip 26, respectively.

In the specific application, the whole panel has a plurality of working faces 20. Prior to mining coal on the working face 20 in mining, an upper gateroad of the working face 20 in mining and a lower gateroad of the next working face 20 are simultaneously formed, in order to improve ventilation performance. Wherein, the lower gateroad of the working face 20 in mining becomes the upper gateroad of the next working face 20 by retaining an entry after the working face 20 in mining is mined, and the working face 20 in mining connects the gateroads to one another during mining. In addition, both the upper gateroad 21 and the lower gateroad 22 of the working face 20 in mining are connected to the haulage dip 24, and the lower gateroad 29 of the next working face 20 is connected to the air-return dip 25.

In the specific application, each working face 20 includes the upper gateroad 21 and the lower gateroad 22 but also has a mining face 23. The mining face 23 of the working face 20 in mining connects the upper gateroad 21 to the lower gateroad 22 via an air passage 27 during mining, that is, the air passage 27 connects the upper gateroad 21 and the lower gateroad 22 of the front working face. The air passage 27 moves as movement of the mining face 23, but need to be maintain in a communicated state. Furthermore, the next working face 20 is connected to the lower gateroad 29 of the working face via an air passage 28. The air passage 28 is located on one side far away from the air-return dip 25. Thereby, an air-flow direction in the air passage 27 includes left and right directions, which may increase air volume and velocity effectively and avoid occurrence of ventilation dead point.

In the specific application, the upper gateroads 21 of the working faces 20 in mining are not retained after being mined. The lower gateroad 22 of the working face 20 is retained beside the gob by using directional roof pre-split cutting, the roof automatically collapses to form a gateroad rib which is used as the upper gateroad of the next working face. In addition, anchor rods and anchor cables are used for roof support during cutting top for retaining the gob-side entry, in particular, NPR constant resistance anchor cables (for example, constant resistance large deformation anchor cable) may be used to overcome and balance friction force along cutting slit when a roof rock mass falls down, and by using pressure force of the roof rock seam and a part of rock mass of the roof, automatically forming entry and non-pillar mining can be achieved. In the specific application, the rocks caved from the roof are crushed and expanded for filling a mined-out area to prevent sinking of an upper roof of the lower gateroad 22 effectively. And, a top-cutting cantilever beam may be used to change distribution laws of surrounding pressure.

Advantageous effects of the present disclosures are presented as follows: as compared with the prior art, the upper gateroad 21 and the lower gateroad 22 of each working face 20 in mining of the present disclosure are connected to the haulage dip 24, and the lower gateroad 29 of the working face is connected to the air-return dip 25, such that ventilation of one mining face 20 can be realized not only by the upper gateroad 21 and the lower gateroad 22 of the current working face, but also by means of the lower gateroad 29 of the next working face. Accordingly, ventilation of the mining face 20 can be increased, the ventilation velocity can be improved, and thus the ventilation performance can be improved so as to improve safety of production in the coal mine.

The technical solution of the present disclosure has already described through some exemplary embodiments. It is apparent that those skilled in the art can make modifications and variations to the invention without departing from the scope of the invention. The invention is intended to cover the modifications and variations provided that they fall in the scope of protection defined by the following claims or their equivalents.

Claims

1. A longwall 110 mining method, wherein, a haulage dip, a air-return dip and a track dip are provided, a plurality of working faces are arranged in a whole panel, both an upper gateroad and a lower gateroad of each mining face in mining are connected to the haulage dip, and the lower gateroad that retains an entry after the working face is mined is used as an upper gateroad of a next working face, and the lower gateroad of the next working face is connected to the air-return dip.

2. The longwall 110 mining method according to claim 1, wherein, the upper gateroad and the lower gateroad of the working face in mining are always connected to each other, and connected to the lower gateroad of the next working face.

3. The longwall 110 mining method according to claim 2, wherein, the upper gateroads of the working face in mining are not retained after accomplishment of mining.

4. The longwall 110 mining method according to claim 1, wherein, directional roof pre-split cutting is used during the gob-side entry retaining process.

5. The longwall 110 mining method according to claim 4, wherein, anchor rods sand anchor cables are used for roof support during cutting top for retaining a gob-side entry.

6. The longwall 110 mining method according to claim 4, wherein, rocks caved from a roof are crushed and expanded for filling a mined-out area to prevent sinking of an upper roof of the lower gateroad.

7. The longwall 110 mining method according to claim 4, wherein, a top-cutting cantilever beam is used to change distribution laws of surrounding pressure.

8. The longwall 110 mining method according to claim 2, wherein, directional roof pre-split cutting is used during the gob-side entry retaining process.

9. The longwall 110 mining method according to claim 3, wherein, directional roof pre-split cutting is used during the gob-side entry retaining process.