Method for passing through chamber in fully mechanized working face with gob-side entry retaining

Abstract

The application provides a method for passing a chamber along a gob-side entry retaining fully-mechanized mining face, comprising the following steps: retaining anchor cables and anchor rods in the chamber mouth and the corner area; reinforcing the outer surface of the concrete wall in the chamber mouth area, and removing the wall skin about to fall off the concrete wall; adjusting the height of the floor of the fully-mechanized mining face, so that the height of the floor of the fully-mechanized mining face is not lower than the height of the floor of the chamber; controlling the height of the cutting drum of the coal mining machine used for advancing the fully-mechanized mining face to be lower than the height of the roof of the chamber; performing advanced support on the roof; controlling the coal mining machine to pass through the chamber, ensuring that the coal mining machine does not stop during the passing through of the chamber while the chamber is exposed; and supporting the area where the chamber is located after the chamber is exposed. The method can effectively improve the advancing and mining efficiency when passing through the chamber underground, can successfully complete various production indexes under the premise of ensuring production safety, and can effectively prevent the risk of roof advanced collapse when passing through the chamber.

Description

Technical Field

[0001] This invention relates to the technical field of coal mine safety production methods, and more specifically, to a method for creating a passage chamber in a fully mechanized longwall mining face with goaf retention. Background Technology

[0002] Currently, the goaf-side roadway retention technology is widely used in actual production because it can improve the recovery rate of the working face, reduce the roadway excavation rate, and improve the mining succession relationship. However, goaf-side roadway retention is affected by secondary mining, resulting in strong mine pressure manifestations behind the working face, which has a serious impact on the roadway. For example, the roof of the goaf-side roadway will be affected by the movement of the overlying strata for a long period of time. Especially when the working face advances to the location of the shunting chamber and other chambers, the impact of mine pressure is particularly strong, and there is a risk of severe coal wall spalling and premature roof collapse, which seriously threatens the safe mining of the fully mechanized mining face.

[0003] Existing fully mechanized longwall mining faces with gob-side entry often encounter the following hazards when passing through the chamber: 1. Significant pressure is observed at the gob-side entry point; 2. The roof at the tail end of the machine may collapse prematurely, leading to a safety accident; 3. The flexible concrete wall at the intake airway of the gob-side entry point may collapse, resulting in no airflow at the working face. These problems can lead to safety accidents and are detrimental to safe production at the fully mechanized longwall mining face. Summary of the Invention

[0004] This invention provides a method for passing through a chamber in a fully mechanized mining face with a goaf-side entry, in order to solve the problem in the prior art where safety accidents occur when passing through a chamber in a fully mechanized mining face, which is detrimental to the safe production of the fully mechanized mining face.

[0005] To address the aforementioned problems, this invention provides a method for a fully mechanized longwall face with goaf retention to pass through a chamber, comprising the following steps: Retention step: retaining the anchor cables and anchor rods at the chamber entrance and within the chamfered area; Management step: reinforcing the exterior of the concrete wall within the chamber entrance area and removing any peeling plaster from the concrete wall; Adjustment step: adjusting the height of the floor slab of the fully mechanized longwall face to ensure it is not lower than the floor slab height of the chamber; Cutterhead adjustment step: controlling the height of the cutterhead of the coal mining machine used to advance the fully mechanized longwall face to be lower than the roof slab height of the chamber; Advance support step: providing advance support to the roof slab; Passage step: controlling the coal mining machine to pass through the chamber, ensuring the machine does not stop during passage while exposing the chamber; Support step: providing support to the area where the chamber is located after it is exposed.

[0006] Furthermore, adjusting the height of the floor plate of the fully mechanized mining face includes: controlling the specific value by which the floor plate of the fully mechanized mining face is higher than the floor plate of the chamber within the range of 0-100mm; when the floor plate of the chamber is higher than the floor plate of the fully mechanized mining face, cutting the floor plate of the chamber to reduce the height of the floor plate of the chamber.

[0007] Furthermore, the method for passing through the chamber in a fully mechanized mining face with a goaf retention roadway also includes the following steps: using anchor cables and / or W-shaped steel strips to support the roof of the chamber with lateral inclined anchor cables, and using longitudinal support steel strips to reinforce the roof when reinforcement is required.

[0008] Furthermore, the process also includes the following steps: when the height of the coal mining machine is greater than the height of the roadway, the coal mining machine is controlled to cut the bottom of the roadway to reduce the height difference between the coal mining machine and the roadway roof, so that the coal mining machine can pass through the roadway smoothly.

[0009] Furthermore, the height to which the coal mining machine cuts the bottom of the roadway should not exceed 200mm; if the height of the coal mining machine is still higher than the roadway height after cutting to 200mm, the coal mining machine should be controlled to cut the roof so that the coal mining machine can pass through the roadway smoothly.

[0010] Furthermore, the advanced support step includes the following steps: using advanced supports to provide advanced support for the roof slab, setting the initial support force of the advanced supports to a set value, opening the side guard plates in the advanced supports, and adjusting the side guard plates to abut against the roof slab to ensure the support effect for the roof slab.

[0011] Furthermore, the process also includes the following steps: dividing the mining area to be mined by the coal mining machine into a rectangular area with a width of A and a length of B. The two ends of the rectangular area in the length direction are the starting point and the ending point of the coal mining machine, respectively. A width C is set, and the rectangular area is divided into D single-time areas arranged along the width direction, where D = A / C. The length of each single-time area is B. The first single-time area mined by the coal mining machine is designated as the first single-time area, and the other single-time areas are arranged sequentially along the width direction up to the Dth single-time area. The width C is not greater than the length of the coal mining machine. The mining width of a single linear motion; each single area is divided into N equal parts from the starting point to the ending point of mining; where A, B, C, D and N are all positive integers; control the coal mining machine to mine (N-1-D) / N of the first single area, then control the coal mining machine to mine back to the starting point along the original path, then control the coal mining machine to mine (ND) / N of the second single area, then control the coal mining machine to mine back to the starting point along the original path, and so on, finally control the coal mining machine to mine (N-1) / N of the Dth single area, and control the coal mining machine to mine back to the starting point along the original path. At this point, the chamber exposure is completed.

[0012] Furthermore, after each mining operation completes the mining of a single area, the roof of that area is supported. When the mining machine moves from the starting point to the ending point, the position of the mining head mining the roof and the position of the mining tail mining the floor are controlled. When the mining machine moves from the ending point to the starting point, the position of the mining head mining the floor and the position of the mining tail mining the roof are controlled.

[0013] Furthermore, the process also includes the following steps: by adjusting the inclined fully mechanized mining face of the coal mining machine, the head of the coal mining machine is controlled to be no more than 5 meters ahead of the tail of the coal mining machine, so as to ensure that the tail of the coal mining machine passes through the chamber entrance quickly.

[0014] Furthermore, the method for passing through the chamber in the fully mechanized mining face along the goaf also includes personnel control measures. These measures include: setting up a warning line at least 20 meters away from the chamber entrance in the direction of the retreat passage to prevent personnel from entering; and when it is necessary to move the advance support, the control personnel will only work within the protection area of ​​the advance support to ensure safety.

[0015] Furthermore, the method for using a fully mechanized longwall face with a goaf-retention tunnel also includes a mine pressure detection step. This step includes: arranging multiple anchor bolt stress sensors and / or anchor cable stress sensors at intervals in the area between the starting point of the coal mining machine and the through-and-retreat passage of the fully mechanized longwall face to monitor changes in mine pressure within the tunnel; and installing a roof delamination observation instrument and a concrete wall stress monitoring instrument in the return tunnel to monitor the delamination of the roof and the stress changes in the concrete wall.

[0016] Applying the technical solution of this invention, this invention provides a method for passing through a chamber in a fully mechanized longwall face with goaf retention, comprising the following steps: Retention step: retaining the anchor cables and anchor rods in the chamber entrance and corner area; Management step: reinforcing the exterior of the concrete wall in the chamber entrance area and removing any peeling plaster from the concrete wall; Adjustment step: adjusting the height of the floor slab of the fully mechanized longwall face so that its height is not lower than the floor slab height of the chamber; Cutterhead adjustment step: controlling the height of the cutterhead of the coal mining machine used to advance the fully mechanized longwall face to be lower than the roof height of the chamber; Advance support step: providing advance support for the roof; Passage step: controlling the coal mining machine to pass through the chamber, ensuring that the machine does not stop during passage while exposing the chamber; Support step: providing support for the area where the chamber is located after it is exposed. This invention provides a scientifically sound method for tunneling through chambers, based on reinforced roof support and adaptable to geological conditions. This method enables safe tunneling through chambers. Practical application demonstrates that this method effectively improves tunneling efficiency in underground coal mines, ensuring production safety while achieving all production targets. It also guarantees the safety of personnel and equipment underground, ensuring safe and efficient mine production. Furthermore, this method effectively controls the roof within the tunnel, preventing premature roof collapse during tunnel crossings. This invention provides technical reference and methodological support for safe and efficient tunnel crossing in working faces with goaf retention. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A flowchart of a method provided by an embodiment of the present invention is shown;

[0019] Figure 2 This diagram illustrates the mining process of a fully mechanized mining face passing through a shunting chamber, as shown in the embodiment of the present invention, from a top-down perspective.

[0020] The above figures include the following reference numerals:

[0021] 10. First single-transaction area;

[0022] 20. Second single-time region;

[0023] 30. Third single-transaction area;

[0024] 40. Fourth single-time region;

[0025] 50. Fifth single-transaction area;

[0026] 60. The sixth single-time region;

[0027] 70. Shunting Chamber. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] like Figure 1 As shown, an embodiment of the present invention provides a method for passing through a chamber in a fully mechanized longwall mining face with a goaf retention system, comprising the following steps:

[0030] Preservation steps: Preserve the anchor cables and anchor bolts in the chamber opening and chamfered area;

[0031] Management steps: Reinforce the exterior facade of the concrete wall in the area of ​​the chamber entrance, and remove the wall plaster that is about to fall off the concrete wall;

[0032] Adjustment steps: Adjust the height of the floor plate of the fully mechanized mining face so that the height of the floor plate of the fully mechanized mining face is not lower than the height of the floor plate of the chamber;

[0033] Cutter adjustment procedure: Control the height of the cutter head of the coal mining machine used to advance the fully mechanized mining face to be lower than the height of the top plate of the chamber;

[0034] Advanced support steps: Perform advanced support on the roof;

[0035] The steps are as follows: control the coal mining machine to pass through the chamber, and while exposing the chamber, ensure that the coal mining machine does not stop during the passage through the chamber;

[0036] Support procedures: After the chamber is exposed, support is provided for the area where the chamber is located.

[0037] This invention provides a scientifically sound method for tunneling through chambers, based on reinforced roof support and adaptable to geological conditions. This method enables safe tunneling through chambers. Practical application demonstrates that this method effectively improves tunneling efficiency in underground coal mines, ensuring production safety while achieving all production targets. It also guarantees the safety of personnel and equipment underground, ensuring safe and efficient mine production. Furthermore, this method effectively controls the roof within the tunnel, preventing premature roof collapse during tunnel crossings. This invention provides technical reference and methodological support for safe and efficient tunnel crossing in working faces with goaf retention.

[0038] It should be noted that, in a specific embodiment of the present invention, after the chamber is exposed, the support for the area where the chamber is located includes the following steps: after the chamber is exposed, the advance support is pushed out in time, and the telescopic beam for exposing the cross section of the chamber is installed. For the side plates of the advance support, the side plates should be installed in time if possible.

[0039] In one specific embodiment of the present invention, the requirements for the coal mining machine are as follows: the coal mining machine shall not be stopped for maintenance in the chamber area. When it is necessary to stop the machine to pick up iron, etc., the coal mining machine shall be controlled to leave the chamber area and can only be operated again after on-site safety confirmation, so as to ensure safety.

[0040] Specifically, adjusting the height of the floor plate of the fully mechanized mining face includes: controlling the height of the floor plate of the fully mechanized mining face to be within the range of 0-100mm above the floor plate of the chamber; when the floor plate of the chamber is higher than the floor plate of the fully mechanized mining face, cutting the floor plate of the chamber to reduce its height. By cutting the chamber floor plate, it is ensured that the height of the floor plate of the fully mechanized mining face is not lower than the height of the floor plate of the chamber, thereby facilitating the movement and installation of equipment such as coal chutes and improving mining efficiency.

[0041] Specifically, the method for passing through the chamber in a fully mechanized longwall mining face with a goaf retention system also includes the following steps: using anchor cables and / or W-shaped steel strips to support the chamber roof with lateral inclined anchor cables; and using longitudinal support steel strips to reinforce the roof when reinforcement is required. By supporting the chamber roof, the risk of premature roof collapse when the coal mining machine passes through the chamber is further avoided.

[0042] Specifically, the process also includes the following steps: when the height of the coal mining machine is greater than the height of the roadway, the coal mining machine is controlled to cut the bottom of the roadway, reducing the height difference between the coal mining machine and the roadway roof, so that the coal mining machine can pass through the roadway smoothly. This setup allows the coal mining machine to pass through the roadway smoothly while ensuring that the roof is not affected as much as possible.

[0043] Optionally, the height to which the coal mining machine cuts the bottom of the roadway should not exceed 200mm; if the height of the coal mining machine is still higher than the roadway height after cutting to 200mm, the coal mining machine is controlled to cut the roof to allow the coal mining machine to pass through the roadway smoothly. By controlling the maximum cutting height, production safety is ensured.

[0044] Specifically, the pre-support procedure includes the following steps: using pre-support brackets to pre-support the roof slab, setting the initial support force of the pre-support brackets to a predetermined value, opening the side guard plates in the pre-support brackets, and adjusting the side guard plates to abut against the roof slab to ensure effective support. Using existing pre-support brackets for pre-support of the roof slab minimizes the risk of premature roof collapse, thereby ensuring the safety of personnel and equipment.

[0045] Specifically, the process also includes the following steps: dividing the mining area to be mined by the coal mining machine into a rectangular area with a width of A and a length of B. The two ends of the rectangular area in the length direction are the starting point and the ending point of the coal mining machine, respectively. A width C is set, and the rectangular area is divided into D single-time areas arranged along the width direction, where D = A / C. The length of each single-time area is B. The first single-time area mined by the coal mining machine is designated as the first single-time area, and the other single-time areas are arranged sequentially along the width direction up to the Dth single-time area. The width C is not greater than the length of the coal mining machine. The mining width of a single linear motion; each single area is divided into N equal parts from the starting point to the ending point of mining; where A, B, C, D and N are all positive integers; control the coal mining machine to mine (N-1-D) / N of the first single area, then control the coal mining machine to mine back to the starting point along the original path, then control the coal mining machine to mine (ND) / N of the second single area, then control the coal mining machine to mine back to the starting point along the original path, and so on, finally control the coal mining machine to mine (N-1) / N of the Dth single area, and control the coal mining machine to mine back to the starting point along the original path. At this point, the chamber exposure is completed.

[0046] Compared to existing methods that require excavating the entire area in a single operation to reveal the chamber, the above method enables rapid chamber access, thus ensuring safety during the process. The logic of this method is referred to by on-site workers as "scraping the stubble." This method refines the steps of "scraping the stubble" to ensure the orderly and scientific nature of rapid chamber access. Of course, any unexploited areas within each single operation must be subsequently excavated (i.e., "scraping the stubble") to complete all mining work.

[0047] like Figure 2 As shown, in a specific embodiment of the present invention, the mining area to be mined by the coal mining machine is divided into six single-time areas, namely, the first single-time area 10, the second single-time area 20, the third single-time area 30, the fourth single-time area 40, the fifth single-time area 50, and the sixth single-time area 60; now, the process of the coal mining machine passing through the shunting chamber 70 will be described in detail, as follows: Figure 2 As shown, the head of the coal mining machine is facing... Figure 2 To the right, the tail section faces Figure 2 To the left, the starting point of the mining is located Figure 2 On the left side of the map, the mining endpoint is located... Figure 2 On the right side of the diagram, from left to right, is the forward direction of the coal mining machine, and from right to left, is the return direction. The coal mining machine first mines 8 / 14 of the first single-pass area 10 along the forward direction, which is approximately 1 / 2, and then returns to the starting point (e.g., the cut-off position) along the return direction. Then, the coal mining machine again mines 9 / 14 of the second single-pass area 20 along the forward direction, and then returns to the starting point along the return direction. Finally, the coal mining machine again mines 10 / 14 of the third single-pass area 30 along the forward direction, which is approximately 5 / 7. Then, the mining machine returns to the starting point along the clockwise direction. Then, the mining machine again mines 11 / 14 of the fourth single-pass area 40 along the clockwise direction. Then, it returns to the starting point along the clockwise direction. Then, the mining machine again mines 12 / 14 (6 / 7) of the fifth single-pass area 50 along the clockwise direction. Then, it returns to the starting point along the clockwise direction. Finally, the mining machine again mines 13 / 14 of the sixth single-pass area 60 along the clockwise direction. Then, it returns to the starting point along the clockwise direction. Thus, the rapid passage through the shunting chamber 70 is completed.

[0048] Specifically, after each mining operation completes the mining of a single area, the roof of that area is supported. When the mining machine moves from the starting point to the ending point, the position of the machine head mining the roof and the position of the machine tail mining the floor are controlled. Conversely, when the mining machine moves from the ending point to the starting point, the position of the machine head mining the floor and the position of the machine tail mining the roof are controlled. This setup ensures orderly mining, guarantees that the degree of mining in the mining area meets actual requirements, and avoids the waste of coal resources.

[0049] Optionally, the process may also include the following steps: adjusting the inclined fully mechanized mining face to control the lead of the mining machine head over the mining machine tail to not exceed 5 meters, ensuring that the mining machine tail quickly passes through the chamber entrance. By flexibly adjusting the inclined fully mechanized mining face, adaptation to complex chamber environments is achieved; by controlling the lead of the mining machine head over the mining machine tail to not exceed 5 meters, the mining machine tail follows the head and quickly passes through the chamber entrance.

[0050] Specifically, the method for passing through chambers in a fully mechanized longwall mining face along the goaf also includes personnel control measures. These measures include: setting up a warning line at least 20 meters away from the chamber entrance in the direction facing the retreat passage to prevent personnel from entering; and when it is necessary to move the advance support, control personnel only work within the protection area of ​​the advance support to ensure safety. By setting up warning lines, workers are prevented from entering dangerous areas; and by controlling personnel to work only within the protection area of ​​the advance support, safety accidents such as workers being injured by falling objects are avoided, thus achieving safe production.

[0051] Specifically, the method for using a fully mechanized longwall face with a goaf-retention tunnel also includes a mine pressure detection step. This step involves: arranging multiple anchor bolt stress sensors and / or anchor cable stress sensors at intervals within the area between the starting point of the coal mining machine and the exit passage of the fully mechanized longwall face to monitor changes in mine pressure within the tunnel; and installing a roof delamination observation instrument and a concrete wall stress monitoring instrument within the exit passage to monitor roof delamination and stress changes in the concrete wall. This setup enables real-time monitoring of underground mine pressure changes and stress changes at various locations, providing structural support for subsequent data acquisition and integrated control.

[0052] In a specific embodiment of the present invention, the No. 52606 coal mine of Daliuta used the method of the present invention to pre-support and reinforce the roof of the chamber. When the fully mechanized mining face in the goaf-side roadway passes through the chamber, compared with the conventional method, the mine pressure is significantly weakened when using the method of the present invention, and the roof subsidence is significantly reduced, with a subsidence of only about 100mm. The method of the present invention was strictly implemented during the pushing mining process, achieving the expected effect and ensuring the safe and efficient production of the mine.

[0053] In summary, this invention provides a method for passing through chambers in a fully mechanized longwall mining face with gob-side entry. This method, based on reinforced roof support, is a scientifically applicable and flexible mining approach tailored to geological conditions, enabling safe passage through chambers. Practical application demonstrates that this method effectively improves mining efficiency when passing through chambers in underground coal mines, ensuring production safety while achieving all production targets. This method guarantees the safety of personnel and equipment underground, ensuring safe and efficient mine production. Furthermore, it provides excellent roof control within the roadway, effectively preventing the risk of premature roof collapse during chamber passage. This invention provides technical reference and methodological support for the safe and efficient passage through chambers in gob-side entry faces.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0056] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0057] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0058] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for passing through a chamber in a fully mechanized longwall mining face with gob-side retention, characterized in that, The steps include the following: Preservation steps: Preserve the anchor cables and anchor bolts in the chamber opening and chamfered area; Management steps: Reinforce the exterior facade of the concrete wall in the area of ​​the chamber entrance, and remove the wall plaster that is about to fall off the concrete wall; Adjustment steps: Adjust the height of the bottom plate of the fully mechanized mining face so that the height of the bottom plate of the fully mechanized mining face is not lower than the height of the bottom plate of the chamber; Cutter adjustment procedure: Control the height of the cutter head of the coal mining machine used to advance the fully mechanized mining face to be lower than the height of the top plate of the chamber; Advanced support steps: Provide advanced support for the roof slab; The steps include: controlling the coal mining machine to pass through the chamber, exposing the chamber, and ensuring that the coal mining machine does not stop during the passage through the chamber; Support steps: After the chamber is exposed, the area where the chamber is located is supported.

2. The method for constructing a passage chamber in a fully mechanized longwall mining face with gob-side retention as described in claim 1, characterized in that, Adjusting the height of the floor plate of the fully mechanized mining face includes: controlling the height of the floor plate of the fully mechanized mining face from the floor plate of the chamber to be within the range of 0-100mm; when the floor plate of the chamber is higher than the floor plate of the fully mechanized mining face, cutting the floor plate of the chamber to reduce the height of the floor plate of the chamber.

3. The method for constructing a passage chamber in a fully mechanized longwall mining face with gob-side retention as described in claim 1, characterized in that, The method for passing through a chamber in a fully mechanized mining face with a goaf retention roadway also includes the following steps: using anchor cables and / or W-shaped steel strips to support the roof of the chamber with lateral inclined anchor cables, and when it is necessary to reinforce the roof, using longitudinal support steel strips to reinforce the roof.

4. The method for passing through a chamber in a fully mechanized longwall mining face with gob-side retention as described in claim 1, characterized in that, The passage step also includes the following steps: when the height of the coal mining machine is greater than the height of the roadway, the coal mining machine is controlled to cut the bottom of the roadway to reduce the height difference between the coal mining machine and the top of the roadway, so that the coal mining machine can pass through the roadway smoothly.

5. The method for passing through a chamber in a fully mechanized longwall mining face with gob-side retention as described in claim 4, characterized in that, The coal mining machine cuts the bottom of the roadway to a height not exceeding 200mm. When the height of the coal mining machine is still higher than the height of the roadway after cutting to 200mm, the coal mining machine is controlled to cut the roof so that the coal mining machine can pass through the roadway smoothly.

6. The method for passing through a chamber in a fully mechanized longwall mining face with gob-side retention as described in claim 1, characterized in that, The advanced support step includes the following steps: using an advanced support bracket to provide advanced support for the top plate, setting the initial support force of the advanced support bracket to a set value, opening the side guard plate in the advanced support bracket, and adjusting the side guard plate to abut against the top plate to ensure the support effect for the top plate.

7. The method for passing through a chamber in a fully mechanized longwall mining face with gob-side retention as described in claim 1, characterized in that, The process further includes the following steps: dividing the mining area to be mined by the coal mining machine into a rectangular area with a width of A and a length of B. The two ends of the rectangular area along its length are the starting and ending points of the coal mining machine. A width C is set, and the rectangular area is divided into D single-phase areas arranged along the width direction, where D = A / C. The length of each single-phase area is B. The first single-phase area mined by the coal mining machine is designated as the first single-phase area, and the other single-phase areas are arranged sequentially along the width direction up to the Dth single-phase area. The width C is not greater than the length of a single linear movement of the coal mining machine. The mining width is adjusted; each single-time area is divided into N equal parts from the mining start point to the mining end point; where A, B, C, D and N are all positive integers; the coal mining machine is controlled to mine (N-1-D) / N of the first single-time area, then the coal mining machine is controlled to mine back to the mining start point along the original path, then the coal mining machine is controlled to mine (ND) / N of the second single-time area, then the coal mining machine is controlled to mine back to the mining start point along the original path, and so on, until finally the coal mining machine is controlled to mine (N-1) / N of the Dth single-time area, and the coal mining machine is controlled to mine back to the mining start point along the original path. At this point, the chamber exposure is completed.

8. The method for passing through a chamber in a fully mechanized longwall mining face with gob-side retention as described in claim 7, characterized in that, After each mining operation of a single area, the roof of that single area is supported. When the mining machine moves from the starting point to the ending point, the position of the mining head on the roof and the position of the mining tail on the floor are controlled. When the mining machine moves from the ending point to the starting point, the position of the mining head on the floor and the position of the mining tail on the roof are controlled.

9. The method for constructing a passage chamber in a fully mechanized longwall mining face with goaf retention according to claim 1, characterized in that, The process further includes the following steps: by adjusting the angle of the coal mining machine to the fully mechanized mining face, the head of the coal mining machine is controlled to be no more than 5 meters ahead of the tail of the coal mining machine, so as to ensure that the tail of the coal mining machine passes through the chamber entrance quickly.

10. The method for constructing a passage chamber in a fully mechanized longwall mining face with gob-side retention according to claim 1, characterized in that, The method for passing through a chamber in a fully mechanized mining face with a goaf retention roadway also includes a personnel control step, which includes: setting up a warning line at least 20 meters away from the chamber entrance in the direction of the retreat passage to prevent personnel from entering; when it is necessary to move the advance support, the control personnel only work within the protection area of ​​the advance support to ensure safety.

11. The method for passing through a chamber in a fully mechanized longwall mining face with gob-side retention as described in claim 7, characterized in that, The method for using a fully mechanized longwall face with a goaf-retention tunnel also includes a mine pressure detection step. The mine pressure detection step includes: arranging multiple anchor bolt stress sensors and / or anchor cable stress sensors at intervals in the area between the mining start point of the coal mining machine and the through-and-retreat passage of the fully mechanized longwall face to monitor changes in mine pressure within the tunnel; and installing a roof delamination observation instrument and a concrete wall stress monitoring instrument in the return passage to monitor the delamination of the roof and the stress changes of the concrete wall.

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