A method for supporting the end of a coal mining face

Abstract

The present application discloses a method for supporting the end of a coal mining working face, comprising: during the tunnel excavation construction, a support method combining anchor cables and steel belts is adopted on the side of the tunnel roof and the side of the sidewall of the non-working face goaf area of ​​the chute tunnel; during the mining period, an end support group is arranged in the end area of ​​the chute tunnel and the working face, and then a support method is selected according to the empty top distance between the end support group and the sidewall of the non-working face goaf area: when the empty top distance is less than or equal to a first preset value, a single dense pillar is not arranged in the end area; when the empty top distance is greater than the first preset value and less than or equal to a second preset value, a single row of dense pillars is arranged in the end area; when the empty top distance is greater than the second preset value, an additional end support is arranged in the end area, and the additional end support is adjacent to the end support group. The present application optimizes support according to different empty top distances in the end area, greatly reduces the workload of workers, and realizes safe and efficient mining of the working face.

Description

Technical Field

[0001] The present application relates to the technical field of coal mine tunnel support methods, and in particular to a method for supporting the end of a coal mining working face. Background Art

[0002] During the production process of the coal mining working face in a coal mine, an empty roof will be formed between the end support and the side wall of the non-working face goaf area, and the empty roof area needs to be supported.

[0003] In the prior art, regardless of the size of the empty top distance, a method of supporting with dense pillars is adopted. Dense pillars are one or two rows of high-density pillars erected on the top line of the coal mining working face. Dense pillars can prevent the roof from sinking or falling along the working face due to poor stability of single pillars when the tunnel roof is pressed. However, dense pillars require workers to enter the end area to support multiple single pillars. At the same time, the safety factor of the end area is low, which has the defects of consuming labor and low efficiency. Moreover, when the empty top distance is large, the dense pillar support effect is poor. Summary of the invention

[0004] The present application provides a method for supporting the end of a coal mining working face, so as to solve the problem that the support efficiency using dense pillars is low and the support effect of using only dense pillars is poor when the empty top distance is large.

[0005] The technical solutions adopted in this application are as follows:

[0006] A method for supporting an end of a coal mining working face, the method comprising:

[0007] During the tunnel excavation construction, a support method combining anchor cables and steel belts is used on the tunnel roof of the drift tunnel and on one side of the side tunnel wall close to the non-working face goaf area;

[0008] During mining, an end support group is arranged at the end area of ​​the drift tunnel and the working face, and then a support method is selected according to the empty top distance between the end support group and the side roadway wall of the non-working face goaf area:

[0009] When the empty top distance is less than or equal to the first preset value, no monomer dense pillar is provided in the end head area;

[0010] When the empty top distance is greater than the first preset value and less than or equal to the second preset value, a single row of dense pillars is arranged in the end area;

[0011] When the empty top distance is greater than the second preset value, an additional end bracket is provided in the end area, and the additional end bracket is adjacent to the end bracket group.

[0012] Furthermore, the support method of the anchor cable combined with the steel belt is:

[0013] A plurality of steel belts are laid on the roof of the drift tunnel and on one side of the side wall close to the non-working face goaf area, and the plurality of steel belts are arranged in a straight line with equal intervals along the length direction of the tunnel roof; three to four holes are arranged on each steel belt, and anchor cables are passed through the holes accordingly, and the end of the anchor cable away from the tunnel roof is connected to a tray and an anchor cable lock.

[0014] Furthermore, the distance between the anchor cables on the same steel belt is 1.4 meters to 1.5 meters, the length of each steel belt is 3.2 meters to 3.4 meters, and the spacing distance between adjacent steel belts is equal and is 1 meter to 1.1 meters.

[0015] Furthermore, the end support group includes at least 4 end support, and is arranged in the direction from the end area of ​​the working face to the end area of ​​the drift tunnel, and the distance between the end support closest to the side wall of the non-working face goaf area and the side wall of the non-working face goaf area is the empty top distance.

[0016] Furthermore, the dense pillars are multiple pillars arranged in a straight line and at equal intervals along the length direction of the drift tunnel;

[0017] When the empty top distance is greater than the third preset value and less than or equal to the second preset value, a double row of dense pillars can also be set in the end area.

[0018] Furthermore, the value range of the first preset value is 1.3 meters to 1.7 meters, the value range of the second preset value is 2.3 meters to 2.7 meters, and the area range of the third preset value is 1.9 meters to 2.1 meters.

[0019] Furthermore, the two sides of the drift roadway are the non-working face goaf area and the working face respectively, the top of the drift roadway is the roadway roof, one end of the non-working face goaf area connected to the roadway roof is the non-working face goaf area side roadway wall, the other end of the non-working face goaf area is the shoulder socket, and the end of the working face connected to the roadway roof is the working face roadway wall;

[0020] The steel belt arranged on the tunnel roof is close to the non-working face goaf area and does not exceed the center line of the tunnel roof.

[0021] The beneficial effects of adopting the technical solution of this application are as follows:

[0022] The present application discloses a method for supporting the end of a coal mining working face, comprising: during the tunnel excavation construction, a support method combining anchor cables and steel belts is adopted on the side of the tunnel roof and the side of the sidewall of the non-working face goaf area of ​​the chute tunnel; during the mining period, an end support group is arranged in the end area of ​​the chute tunnel and the working face, and then a support method is selected according to the empty top distance between the end support group and the sidewall of the non-working face goaf area: when the empty top distance is less than or equal to a first preset value, a single dense pillar is not arranged in the end area; when the empty top distance is greater than the first preset value and less than or equal to a second preset value, a single row of dense pillars is arranged in the end area; when the empty top distance is greater than the second preset value, an additional end support is arranged in the end area, and the additional end support is adjacent to the end support group. The present application optimizes support according to different empty top distances in the end area, greatly reduces the workload of workers, and realizes safe and efficient mining of the working face. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 A schematic diagram of another method for supporting the end of a coal mining face provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of another method for supporting the end of a coal mining face provided in an embodiment of the present application;

[0026] Figure 3 A schematic diagram of another method for supporting the end of a coal mining face provided in an embodiment of the present application.

[0027] Illustration Description:

[0028] Among them, 1. chute tunnel, 2. non-working face goaf, 21. side tunnel of non-working face goaf, 22. shoulder socket, 3. working face, 31. working face tunnel, 4. anchor cable, 5. steel belt, 6. end support group, 7. single dense pillar, 8. new end support. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0031] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components explicitly listed but may include other components not explicitly listed or inherent to such products or devices.

[0033] See also Figure 1 , which is a schematic diagram of a method for supporting the end of a coal mining face provided in an embodiment of the present application; see Figure 2 , which is a schematic diagram of another method for supporting the end of a coal mining working face provided in an embodiment of the present application; see Figure 3 , which is a schematic diagram of another method for supporting the end of a coal mining face provided in an embodiment of the present application.

[0034] The embodiment of the present application provides a layout of a coal mining face. Specifically, the coal mining face includes a chute tunnel 1, and the two sides of the chute tunnel 1 are a non-working face goaf 2 and a working face 3, respectively. The top of the chute tunnel 1 is the tunnel roof, and the bottom of the chute tunnel 1 is the tunnel floor. The end of the non-working face goaf 2 connected to the tunnel roof is a non-working face goaf side tunnel wall 21, and the other end of the non-working face goaf 2 is a shoulder 22. The end of the working face 3 connected to the tunnel roof is a working face tunnel wall 31. Based on the above layout, the present application provides an end support method implemented in the end area of ​​the chute tunnel 1 and the end area of ​​the working face 3.

[0035] A method for supporting the end of a coal mining face in the present application comprises:

[0036] During the tunnel excavation construction, a support method combining anchor cables 4 and steel belts 5 is adopted on the tunnel roof of the drift tunnel 1 and on one side of the side tunnel wall 21 close to the non-working face goaf area.

[0037] See also Figure 1As shown, in this embodiment, the support method of the anchor cable 4 combined with the steel belt 5 is as follows: a plurality of steel belts 5 are laid on the roof of the drift tunnel 1 and on one side close to the side roadway wall 21 of the non-working face goaf area, and the plurality of steel belts 5 are arranged in a straight line with equal spacing along the length direction of the roadway roof; three to four holes are set on each steel belt 5, and the anchor cables 4 are correspondingly penetrated in the holes, and the end of the anchor cable 4 away from the roadway roof is connected with a tray and an anchor cable 4 lock. The distance between the anchor cables 4 on the same steel belt 5 is 1.4 meters to 1.5 meters, the length of each steel belt 5 is 3.2 meters to 3.4 meters, and the spacing distance between adjacent steel belts 5 is equal and the spacing distance is 1 meter to 1.1 meters.

[0038] In this embodiment, it is preferred to use: SKP22-1 / 1860×8000mm anchor cable 4, steel belt 5 with a length of 3.3m, each steel belt 5 is equipped with three anchor cables 4, the eye distance (i.e. hole distance) of the steel belt 5 is 1.5m, and the distance between the front and rear steel belts 5 is 1m.

[0039] During the tunnel excavation construction, a support method combining anchor cables 4 and steel belts 5 is used on the tunnel roof of the drift tunnel 1 and on one side of the side tunnel wall 21 close to the non-working face goaf, in order to control the roof of the end area during mining; the distance between the front and rear steel belts 5 is set to 1m, in order to weaken the roof support behind the top cutting line and promote its timely collapse.

[0040] Furthermore, during mining, an end support group 6 is arranged at the end areas of the drift tunnel 1 and the working face 3, and then a support method is selected according to the empty top distance between the end support group 6 and the side roadway wall 21 of the non-working face goaf area.

[0041] In this embodiment, the end support group 6 includes at least 4 end supports, and they are arranged in the direction from the end area of ​​the working face 3 to the end area of ​​the chute tunnel 1. When the end supports are arranged in the direction from the end area of ​​the working face 3 to the end area of ​​the chute tunnel 1, the distance between the end support closest to the side roadway 21 of the non-working face goaf area and the side roadway 21 of the non-working face goaf area is the empty top distance. In the space corresponding to the empty top distance, there is neither a steel belt 5 nor an end support support. Based on this, this embodiment adopts different support methods according to the size of the empty top distance, specifically:

[0042] When the empty top distance is less than or equal to the first preset value, no single dense pillar 7 is set in the end area. When the coal mining working face is normally mined, when the distance between the position of the end support group 6 and the side tunnel wall 21 of the non-working face goaf is less than 0.5 meters, workers do not need to enter this end area, avoid carrying single pillars, achieve inherent safety, and speed up the advancement of the working face.

[0043] See also Figure 2 As shown, when the empty top distance is greater than the first preset value and less than or equal to the second preset value, a single row of dense pillars is set in the end area. The empty top distance between the end support position and the side lane 21 of the non-working face goaf is less than or equal to 2.5 meters and greater than 1.5 meters, such as irregular mining, large-angle mining, inclined mining, etc. In this case, the end position space is large, but the empty top distance will gradually decrease as the working face 3 advances. At this time, it is not enough or not suitable to add supports, so a single row of dense pillars is set. In addition, when the empty top distance is greater than the third preset value and less than or equal to the second preset value (preferably when the empty top distance is less than or equal to 2.5 meters and greater than 2 meters), a single row of dense pillars can be set on the basis of a single row of dense pillars, that is, when the empty top distance is less than or equal to 2.5 meters and greater than 2 meters, a double row of dense pillars is set in the end area.

[0044] See also Figure 3 As shown, when the empty top distance is greater than the second preset value, a new end head bracket 8 is provided in the end head area, and the new end head bracket 8 is adjacent to the end head bracket group 6. In this case, the space corresponding to the empty top distance is large, and the empty top distance does not decrease as the working surface 3 advances, so a new end head bracket 8 can be added for support.

[0045] In this embodiment, the first preset value ranges from 1.3 meters to 1.7 meters, the second preset value ranges from 2.3 meters to 2.7 meters, and the third preset value ranges from 1.9 meters to 2.1 meters. Preferably, the first preset value is 1.5 meters, the second preset value is 2.5 meters, and the third preset value is 2 meters.

[0046] The coal mining working face end support method of the present invention optimizes support according to different empty top distances in the end area, has simple construction and reliable support, greatly reduces the labor workload of workers, and realizes safe and efficient mining of the working face.

[0047] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A method for supporting the end of a coal mining face. It is characterized in that The method comprises: During the tunnel excavation construction, a support method combining anchor cables and steel belts is used on the tunnel roof of the drift tunnel and on one side of the side tunnel wall close to the non-working face goaf area; A plurality of steel belts are laid on the roof of the drift tunnel and on one side of the side wall of the non-working face goaf area, and the plurality of steel belts are arranged in a straight line with equal intervals along the length direction of the tunnel roof; three to four holes are arranged on each steel belt, and anchor cables are passed through the holes accordingly, and the end of the anchor cable away from the tunnel roof is connected to a tray and an anchor cable lock; During mining, an end support group is arranged at the end area of ​​the drift tunnel and the working face, and then a support method is selected according to the empty top distance between the end support group and the side roadway wall of the non-working face goaf area: The end support group includes at least 4 end supports, and they are arranged in the direction from the end area of ​​the working face to the end area of ​​the drift tunnel, and the distance between the end support closest to the side roadway wall of the non-working face goaf area and the side roadway wall of the non-working face goaf area is the empty top distance; When the empty top distance is less than or equal to the first preset value, no monomer dense pillar is provided in the end head area; When the empty top distance is greater than the first preset value and less than or equal to the second preset value, a single row of dense pillars is arranged in the end area; When the empty top distance is greater than the second preset value, an additional end bracket is provided in the end area, and the additional end bracket is adjacent to the end bracket group.

2. The method for supporting the end of a coal mining face according to claim 1, It is characterized in that The distance between the anchor cables on the same steel belt is 1.4 meters to 1.5 meters, the length of each steel belt is 3.2 meters to 3.4 meters, and the spacing distance between adjacent steel belts is equal and the spacing distance is 1 meter to 1.1 meters.

3. The method for supporting the end of a coal mining face according to claim 1, It is characterized in that The dense pillars are multiple pillars arranged in a straight line with equal spacing along the length direction of the drift tunnel; When the empty top distance is greater than the third preset value and less than or equal to the second preset value, double rows of dense pillars can also be set in the end area.

4. The method for supporting the end of a coal mining face according to claim 1, It is characterized in that The value range of the first preset value is 1.3 meters to 1.7 meters, the value range of the second preset value is 2.3 meters to 2.7 meters, and the area range of the third preset value is 1.9 meters to 2.1 meters.

5. The method for supporting the end of a coal mining face according to claim 1, It is characterized in that The two sides of the drift roadway are the non-working face goaf area and the working face respectively, the top of the drift roadway is the roadway roof, the end of the non-working face goaf area connected to the roadway roof is the non-working face goaf area side roadway wall, the other end of the non-working face goaf area is the shoulder socket, and the end of the working face connected to the roadway roof is the working face roadway wall; The steel belt arranged on the tunnel roof is close to the non-working face goaf area and does not exceed the center line of the tunnel roof.

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