Ventilation method for small coal pillar gob driving

Abstract

The application provides a ventilation method for small coal pillar gob-side entry driving. In the process of small coal pillar gob-side entry driving, the ventilation method of the application drives multiple roadways and waist roadways in the adjacent and next adjacent working faces of the coal mining face in turn, and appropriately places local fans and wind barriers and moves the positions of the local fans, so as to form an air inlet and return channel, and keep supplying air to the driving working face, which overcomes the problem of insufficient air volume at the driving head caused by the long ventilation distance, and solves the problem of insufficient ventilation in the prior art when the small coal pillar gob-side entry driving process is used.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine safety production, in particular to a ventilation method for small coal pillar gob-side entry driving. BACKGROUND

[0002] With the development of high strength mining technology, the existing mining working face recovery roadway is more than 3000m, even more than 5000m. In order to ensure the ventilation of long distance driving roadway, two ways are usually used: one is to use high-power local fan during driving; the other is to use double-lane driving, which provides fresh air flow to each other.

[0003] The problem of double-lane driving is that the coal pillar between the two lanes is affected by multiple mining, causing serious deformation of the roadway, obvious floor heave, even coal pillar instability, and further causing coal pillar type rock burst accident. In order to prevent rock burst, small coal pillar or no coal pillar mining technology is used, that is, single-lane driving is used in the working face, and U-shaped ventilation is formed through the transportation crossheading and the return air crossheading. After the stability of the goaf in the working face, the next working face is driven along the goaf with a coal pillar less than 8m in width, forming the return air crossheading of the next working face, and then connecting with the transportation crossheading to form a new working face. However, a prerequisite for small coal pillar mining is that the gob-side entry driving must be carried out after the stability of the goaf.

[0004] At present, most of the coal mines use sequential mining, that is, the adjacent working faces are mined in turn. When small coal pillar gob-side entry driving is carried out, it can only be driven through the transportation crossheading, cut, and stable range of the goaf of the adjacent working face. The problem caused by this is that the single-lane driving distance is too long. If the length of the working face is 5000m, the single-lane driving distance is often 11000m, which further causes the problem of long driving ventilation distance and insufficient head-on air volume. The existing local fan single-lane air supply distance is not more than 5000m, so that the high strength mining technology is often difficult to realize small coal pillar technology due to insufficient ventilation. Further, the prevention and control of rock burst is not complete, and there is a risk.

[0005] As can be seen from the above, there is a problem of insufficient ventilation when using small coal pillar gob-side entry driving technology in the prior art. SUMMARY

[0006] The main purpose of the present application is to provide a ventilation method for small coal pillar gob-side entry driving, to solve the problem of insufficient ventilation when using small coal pillar gob-side entry driving technology in the prior art.

[0007] To achieve the above object, the present application provides a ventilation method for small coal pillar gob-side entry driving, comprising: separately driving a first driving face and a second driving face which are next to and adjacent to a coal mining face respectively and supplying air from a main roadway by a local fan, driving to a first preset distance to form a first roadway and a second roadway respectively; driving the first driving face and the second driving face towards each other to form a first crossheading; moving the local fan into the first roadway, separately driving a third driving face and a fourth driving face along the first roadway and the second roadway to a second preset distance to form a third roadway and a fourth roadway; driving the third driving face towards the fourth driving face to form a second crossheading which penetrates the fourth roadway, and driving the fourth driving face towards a goaf of the coal mining face by a third preset distance to form a third crossheading; placing a wind barrier in the first crossheading, and moving the local fan to a first position in the second crossheading; driving a fifth driving face along the fourth roadway to a cut position to form a fifth roadway; driving a sixth driving face along the goaf at the third crossheading to a position corresponding to the first crossheading to form a sixth roadway; driving the sixth driving face towards the first crossheading to form a fourth crossheading which penetrates the first crossheading; moving the local fan to a second position in the second crossheading; driving a seventh driving face along the goaf at the third crossheading to the cut position to form a seventh roadway; placing a wind barrier in the third crossheading, and then moving the local fan into the sixth roadway; penetrating the cut, and driving an eighth driving face along the goaf of the sixth roadway to form an eighth roadway to form a complete air inlet and return channel.

[0008] Further, the first preset distance is 1 / 3 of the advancing length of the coal mining face; and / or the second preset distance is 2 / 3 of the advancing length of the coal mining face.

[0009] Further, the distance between the fourth driving face after driving by the third preset distance and the goaf of the coal mining face is equal to the width of the small coal pillar.

[0010] Further, when the local fan is placed in the first roadway, the local fan is located at one end of the first roadway close to the first crossheading.

[0011] Further, the first position is located at one end of the second crossheading close to the third roadway; and / or the second position is located at one end of the second crossheading close to the fourth roadway.

[0012] When the technical scheme of the present application is applied to the small coal pillar gob-side entry driving process, a plurality of roadways and crossheadings are driven in the adjacent and next adjacent working faces of the coal mining face in sequence, and the local fan and the wind barrier are appropriately placed and the position of the local fan is correspondingly moved, so as to form an air inlet and return channel, and air supply to the driving face is maintained, which overcomes the problem of insufficient driving head air volume caused by too long ventilation distance, and solves the problem of insufficient ventilation when the small coal pillar gob-side entry driving process is used in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification. The drawings illustrate one illustrative embodiment of the application and, together with the description, serve to explain the application. In the drawings:

[0014] Figure 1 A flow chart showing the ventilation method for small coal pillar gob-side entry driving in one embodiment of the application; and

[0015] Figure 2 A schematic diagram showing the ventilation method in the first stage in one embodiment of the application;

[0016] Figure 3 A schematic diagram showing the ventilation method in the second stage in one embodiment of the application;

[0017] Figure 4 A schematic diagram showing the ventilation method in the third stage in one embodiment of the application;

[0018] Figure 5 A schematic diagram showing the ventilation method in the fourth stage in one embodiment of the application;

[0019] Figure 6 A schematic diagram showing the ventilation method in the fifth stage in one embodiment of the application.

[0020] Wherein, the above drawings include the following reference signs:

[0021] 1, first roadway; 2, second roadway; 3, third roadway; 4, fourth roadway; 5, fifth roadway; 6, sixth roadway; 7, seventh roadway; 8, eighth roadway; 9, first waist roadway; 10, second waist roadway; 11, third waist roadway; 12, fourth waist roadway; 13, local fan; 14, wind barrier; 15, coal mining face. DETAILED DESCRIPTION

[0022] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] It should be noted that, unless otherwise specified, all the technical and scientific terms used in the present application have the same meaning as that generally understood by the ordinary skilled person in the technical field to which the present application belongs.

[0024] In the present application, the orientation words such as "upper, lower, top, bottom" used without the opposite description are generally directed to the direction shown in the drawings, or directed to the vertical, perpendicular or gravity direction of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0025] Obviously, the above-described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0026] In order to solve the problem of insufficient ventilation in the small coal pillar gob-side entry driving process in the prior art, the present application provides a small coal pillar gob-side entry driving ventilation method.

[0027] As shown in Figure 1 The small coal pillar gob-side entry driving ventilation method comprises the following steps: respectively driving a first driving face and a second driving face adjacent to the coal mining face 15 and supplying air from the main roadway through the local fan 13, driving to a first preset distance, and respectively forming a first roadway 1 and a second roadway 2; the first driving face and the second driving face are driven towards each other to form a first waist roadway 9; the local fan 13 is moved into the first roadway 1, and a third driving face and a fourth driving face are respectively driven along the first roadway 1 and the second roadway 2 to a second preset distance to form a third roadway 3 and a fourth roadway 4; the third driving face is driven towards the fourth driving face to form a second waist roadway 10 that penetrates the fourth roadway 4, and the fourth driving face is driven towards the goaf of the coal mining face 15 by a third preset distance to form a third waist roadway 11; the wind barrier 14 is placed in the first waist roadway 9, and the local fan 13 is moved to a first position in the second waist roadway 10; a fifth driving face is driven along the fourth roadway 4 to a cut position to form a fifth roadway 5; a sixth driving face is driven along the goaf at the third waist roadway 11 to a position corresponding to the first waist roadway 9 to form a sixth roadway 6; the sixth driving face is driven towards the first waist roadway 9 to form a fourth waist roadway 12 that penetrates the first waist roadway 9; the local fan 13 is moved to a second position in the second waist roadway 10; a seventh driving face is driven along the goaf at the third waist roadway 11 to the cut position to form a seventh roadway 7; the wind barrier 14 is placed in the third waist roadway 11, and then the local fan 13 is moved into the sixth roadway 6; the cut is penetrated, and an eighth driving face is driven along the goaf of the sixth roadway 6 to form an eighth roadway 8, thereby forming a complete air inlet and outlet passage.

[0028] When carrying out the small coal pillar gob-side excavation process, multiple roadways and waist roadways are excavated sequentially in the adjacent and next-to-adjacent working faces of the coal mining face 15. Local fans 13 and air barriers 14 are appropriately placed and the position of local fans 13 is moved accordingly to form an intake and return air channel, maintain air supply to the excavation face, overcome the insufficient air volume at the excavation face caused by excessive ventilation distance, and thus ensure the smooth progress of small coal pillar gob-side excavation.

[0029] In this embodiment, the ventilation method for the small coal pillar roadway along the goaf includes five stages, and the specific content of each stage is described below.

[0030] Phase 1: As Figure 2 As shown, after the two tunneling teams complete the tunneling of coal face 15, they begin the mining of coal face 15, at which point coal face 15 forms a U-shaped ventilation system. Then, the two tunneling teams begin tunneling of the next adjacent first tunneling face and the adjacent first tunneling face, respectively. Each tunneling face is independently ventilated from the main roadway via a local fan 13. When the tunneling distance reaches the first preset distance, the first roadway 1 and the second roadway 2 are formed respectively. Then, the two tunneling heads tunnel towards each other, forming the first side roadway 9 after they are connected. The first roadway 1 formed by the first tunneling face introduces fresh airflow, and the second roadway 2 formed by the second tunneling face forms a return airway. U-shaped ventilation is achieved through the first roadway 1, the first side roadway 9, and the second roadway 2.

[0031] In this embodiment, the first preset distance is 1 / 3 of the advancing length of the coal mining face 15.

[0032] Phase Two: As Figure 3 As shown, based on the U-shaped ventilation formed in the first stage, the local fan 13 is first moved into the first roadway 1, placing it in a fresh airflow to supply air to the third and fourth tunneling faces. Specifically, when placing the local fan 13 in the first roadway 1, it is located at one end of the first roadway 1 near the first side roadway 9. After the local fan 13 is in place, the third and fourth tunneling faces are excavated along the first roadway 1 and the second roadway 2, respectively. When the excavation distance reaches the second preset distance, the third roadway 3 and the fourth roadway 4 are formed. Then, the third tunneling face excavates towards the fourth tunneling face to form the second side roadway 10, which is connected to the fourth roadway 4. The fourth tunneling face excavates towards the goaf side of the coal mining face 15 for the third preset distance to form the third side roadway 11. It can be understood that the third side roadway 11 is connected to the second side roadway 10.

[0033] In this embodiment, the second preset distance is 2 / 3 of the advancing length of the coal mining face 15.

[0034] In this embodiment, after the fourth tunneling face has tunneled a third preset distance, the distance between it and the goaf of the coal mining face 15 is equal to the width of the small coal pillar. That is, the fourth tunneling face stops tunneling when the distance between it and the goaf is equal to the width of the small coal pillar.

[0035] Phase Three: As Figure 4 As shown, after the third waist roadway 11 and the second waist roadway 10 are connected, a wind barrier 14 is installed in the first waist roadway 9. Simultaneously, a local fan 13 is moved to a first position within the second waist roadway 10, ensuring the fan is exposed to fresh airflow to supply air to the fifth and sixth tunneling faces. Specifically, the first position is located at the end of the second waist roadway 10 near the third roadway 3. After the local fan 13 is in place, the fifth tunneling face proceeds along the fourth roadway 4 towards the cut-out direction until the cut-out position is reached, thus forming the fifth roadway 5. The sixth tunneling face then proceeds along the goaf according to the width of the small coal pillar, tunneling to the position corresponding to the first waist roadway 9, thus forming the sixth roadway 6. At this point, the direction of the sixth tunneling face is towards the main roadway. The ventilation system formed in the third stage is as follows: the first and third tunneling faces form air intakes to introduce fresh air; the fifth and sixth tunneling faces are supplied with air through local fans 13; and the fourth and second tunneling faces form return air channels to exhaust stale air.

[0036] Phase Four: such as Figure 5 As shown, when the sixth tunneling face reaches the position corresponding to the first waist roadway 9 along the goaf excavation roadway, it excavates towards the first waist roadway 9 to form the fourth waist roadway 12, which is connected to the first waist roadway 9. The local fan 13 is moved to a second position within the second waist roadway 10, placing it in a fresh airflow to supply air to the seventh tunneling face. Specifically, the second position is located at one end of the second waist roadway 10 near the fourth roadway 4. The seventh tunneling face is excavated along the goaf in the direction of the cut-out at the third waist roadway 11, reaching the cut-out position to form the seventh roadway 7. The ventilation system formed in the fourth stage is as follows: the first and third tunneling faces form intake air, introducing fresh airflow; the fifth, sixth, and seventh tunneling faces are all supplied with air through the local fan 13; the fourth, sixth, and second tunneling faces form return air channels to exhaust stale air.

[0037] Fifth stage: such as Figure 6As shown, after the seventh heading face is in place, and the fourth crossheading 12 and the first crossheading 9 are connected, a wind barrier 14 is arranged in the third crossheading 11, and the local fan 13 is moved to the sixth roadway 6, so that the local fan 13 is in the fresh air flow, and air is supplied to the eighth heading face. Specifically, the wind barrier 14 is located in the middle of the third crossheading 11, and the local fan 13 is located in the middle of the sixth roadway 6. At this time, one heading team penetrates the cut, and arranges the cut mine engineering, and the other heading team penetrates the eighth heading face along the sixth roadway 6 to form the eighth roadway 8, and forms a complete air inlet and return air passage. The ventilation system formed in the fifth stage is that the first heading face, the third heading face, the second crossheading 10, the fourth heading face, the fifth heading face, the cut, the seventh heading face, and the sixth heading face form an air inlet passage, and introduce fresh air flow; the eighth heading face supplies air through the local fan 13; the fourth crossheading 12 and the second heading face form an air return passage, and exhaust the dirty air.

[0038] It should be noted that, since the actual advancing length of the coal mining face of each coal mine is different, when the advancing length is longer, the roadway and the crossheading located in the middle position can be excavated more when the ventilation method of the small coal pillar gob-side entry driving in the embodiment is used, so as to overcome the limitation of the air supply length of the local fan 13, meet the ventilation demand, and can be selected according to the actual demand.

[0039] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects: when the small coal pillar gob-side entry driving process is carried out, a plurality of roadways and crossheadings are excavated in the adjacent and next adjacent working faces of the coal mining face 15 in turn, and the local fan 13 and the wind barrier 14 are appropriately placed and the position of the local fan 13 is moved accordingly, so as to form an air inlet and return air passage, maintain air supply to the heading face, overcome the insufficient heading head air volume caused by the too long ventilation distance, and thus ensure the smooth progress of the small coal pillar gob-side entry driving.

[0040] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, they mean that there is a feature, step, work, device, component, and / or combination thereof.

[0041] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0042] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A ventilation method for roadway excavation along a small coal pillar, characterized in that, include: The first tunneling face and the second tunneling face adjacent to the coal mining face (15) are tunneled respectively, and ventilation is supplied from the main roadway through the local fan (13). The tunnels are tunneled to the first preset distance, forming the first roadway (1) and the second roadway (2) respectively. The first tunneling face and the second tunneling face tunnel towards each other to form the first waist roadway (9); Move the fan (13) into the first roadway (1), and excavate the third and fourth tunneling faces along the first roadway (1) and the second roadway (2) respectively, and excavate to the second preset distance to form the third roadway (3) and the fourth roadway (4); The third tunneling face tunnels toward the fourth tunneling face to form a second side roadway (10) that is connected to the fourth roadway (4), and the fourth tunneling face tunnels toward the goaf of the coal mining face (15) by a third preset distance to form a third side roadway (11); Place a windbreak (14) in the first waist alley (9) and move the local fan (13) to the first position in the second waist alley (10); The fifth tunneling face is excavated along the fourth tunnel (4) to the cut-out position, forming the fifth tunnel (5); At the third waist lane (11), the sixth tunneling face is excavated along the goaf towards the main roadway, and the tunnel is excavated to the position corresponding to the first waist lane (9) to form the sixth roadway (6); The sixth tunneling face is tunneled toward the first waist lane (9) to form a fourth waist lane (12) that is connected to the first waist lane (9); Move the fan (13) to the second position within the second waist alley (10); At the third waist roadway (11), the seventh tunneling face is excavated along the goaf towards the cut-in point, and the tunnel is excavated to the cut-in point to form the seventh roadway (7); The windbreak (14) is placed in the third waist lane (11), and then the local fan (13) is moved to the sixth lane (6); The cut-through hole is opened, and at the same time, the eighth tunneling working face is excavated along the sixth tunnel (6) to form the eighth tunnel (8), which constitutes a complete intake and return air passage.

2. The ventilation method for roadway excavation along the goaf using a small coal pillar according to claim 1, characterized in that, The first preset distance is 1 / 3 of the advancing length of the coal mining face (15); and / or The second preset distance is 2 / 3 of the advancing length of the coal mining face (15).

3. The ventilation method for roadway excavation along a small coal pillar according to claim 1, characterized in that, The distance between the fourth tunneling face and the goaf of the coal mining face (15) after the fourth tunneling face has tunneled the third preset distance is equal to the width of the small coal pillar.

4. The ventilation method for roadway excavation along the goaf using a small coal pillar according to claim 1, characterized in that, When the fan (13) is placed in the first lane (1), the fan (13) is located at one end of the first lane (1) near the first waist lane (9).

5. The ventilation method for roadway excavation along the goaf using a small coal pillar according to claim 1, characterized in that, The first location is located at one end of the second side lane (10) near the third lane (3); and / or The second position is located at one end of the second waist lane (10) near the fourth lane (4).

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