Piezoelectric type carcass composite separating wall and using method thereof

Abstract

The invention relates to the technical field of coal pillar-free mining, and provides a piezoelectric type matrix composite separating wall and a using method thereof. Comprising a supporting body, a filling bag body and a tire body, wherein the supporting body is of a door type structure, the filling bag body is located at the bottom of a supporting body main body, and the tire body is arranged at the top of the supporting body main body in a sleeving mode; grouting is conducted in the filling bag body, and inflation is conducted in the tire body; a pressure sensor is arranged on the top of the supporting body main body and used for detecting the pressed state of the filling bag body after the filling bag body is filled with the specified pressure. The separation wall has the beneficial effects that the flexible yielding space is added, the instability damage of a roadway caused by a high stress condition is reduced, and meanwhile, the shear damage of a top plate is reduced through the flexible yielding space. It needs to be pointed out that the joint effect of the wall body and the top plate can be guaranteed by increasing the flexible pressure in the early stage of entry retaining, air leakage of a goaf is avoided, mine maintenance is facilitated, and particularly safety production of a high-gas mine is improved.

Description

Technical Field

[0001] The invention relates to the technical field of coal pillar-free mining, and in particular to a piezoelectric matrix composite isolation wall and a use method thereof. Background Art

[0002] Coal is the main energy source in China. The mining volume and consumption continue to increase, and the reserves of high-quality resources are shrinking. With the reduction of non-renewable coal resources and the construction of a conservation-oriented society, it is imperative to improve the recovery rate of coal mining faces. The technology of retaining the roadway along the goaf is to retain the recovery roadway of the working face during the recovery process of the working face through effective roadside support and roadway support technology, and use it as a recovery roadway of the adjacent working face. That is, one roadway needs to serve two coal mining working faces, which can save one roadway.

[0003] At present, gob-side tunneling technology covers a variety of implementation methods, such as soft film bag injection of high-water materials, rigid formwork pumping concrete, and top-cutting unloading of waste rock support. The application of these technologies not only optimizes the traditional U-shaped ventilation method, reduces the gas accumulation and outburst danger of coal mining working faces, but also can recover excess coal, corner coal and tunnel protection coal pillars, improve the recovery rate of coal resources, reduce the amount of tunnel excavation engineering, ease the tension of mine excavation and replacement, and extend the service life of mines.

[0004] The main disadvantages of the currently used gob-side tunneling technology include:

[0005] (1) The filling material has poor toughness and lacks flexible pressure relief space. It is easy to crack under high stress conditions, which leads to instability and damage of the tunnel. The tunnel and the goaf are interconnected, causing spontaneous combustion of coal in the goaf and leakage of toxic and harmful gases.

[0006] (2) The effect of some materials such as concrete on the top connection in the early stage of the tunnel retention is poor, which can easily lead to air leakage in the goaf, seriously threatening the safe production of mines, especially high-gas mines;

[0007] (3) When the strength of the filling body exceeds the strength of the immediate roof, immediate bottom and top coal, high stress can easily lead to shear failure of the roof and bottom plates, which in turn causes the roof to fall off and the bottom to bulge seriously, making it difficult to coordinate the deformation of the roof and the filling body in the roadway area.

[0008] (4) Traditional gob-side tunnel retaining technology mainly relies on manual operation and monitoring, and lacks the support of advanced intelligent systems. As a result, a large amount of manual intervention and judgment is still required in aspects such as support structure setting and ventilation management, which reduces work efficiency and safety.

[0009] In view of this, the present invention is proposed. Summary of the invention

[0010] The purpose of the present invention is to provide a piezoelectric carcass composite isolation wall and a method of using the same to solve the technical problems existing in the prior art.

[0011] To achieve the above object, the technical solution adopted by the present invention is: a piezoelectric matrix composite isolation wall, comprising: a support body, a filling bag body and a matrix body; wherein the support body is a door-type structure, the filling bag body is located at the bottom of the support body body, and the matrix body is sleeved on the top of the support body body;

[0012] Grouting is injected into the filling bag body, and air is inflated into the tire body;

[0013] A pressure sensor is disposed on the top of the support body, and the pressure sensor is used to detect the pressure state of the filling bag after it is filled with a specified pressure.

[0014] In an optional embodiment, a plurality of first grooves are evenly arranged on the top of the support body, and one of the pressure sensors is disposed in each of the first grooves.

[0015] In an optional embodiment, the pressure sensor is a piezoelectric sensor, and the lead wires of the piezoelectric sensor are led out from the wire holes on the support body.

[0016] In an optional embodiment, a second groove is further provided on the support body, and a signal receiving module and a signal sending module are arranged in the second groove.

[0017] In an optional embodiment, the filling bag body is a three-dimensional flexible bag, and the filling bag body is arranged with multiple first drill holes at a first height, and the first drill holes are used for grouting and gas extraction; the filling bag body is arranged with multiple second drill holes at a second height, and the second drill holes are used for anchoring.

[0018] In an optional embodiment, a sub-pull ring is arranged at the upper top corner of the filling bag body, and the sub-pull ring is connected to the main pull ring on the support body.

[0019] In an optional embodiment, the carcass includes an outer protective carcass and an inner carcass, the outer protective carcass is in contact with the top plate, and the inner carcass is in contact with the support body and the pressure sensor.

[0020] In an optional embodiment, an inflation hole and a pressure sensor are provided on the tire body, and the pressure sensor is used to detect the pressure inside the tire body.

[0021] On the other hand, the present invention also provides a method for using the piezoelectric carcass composite isolation wall as described above, comprising the following steps:

[0022] S1: Coal mining operations are carried out along the advancing direction of the working face;

[0023] S2: Use rock-blocking supports to prevent the goaf from collapsing and entering the tunnel;

[0024] S3: arranging a first isolation device along the advancing direction of the working face, using the carcass, the support body and the filling bag body to form the first isolation device, injecting grout into the filling bag body and anchoring and solidifying it, and inflating the carcass body to a specified pressure;

[0025] At this time, the inner carcass is in contact with the support body; the outer protective carcass is in contact with the top plate; the pressure sensor on the support body detects the pressure of the top plate borne by the carcass in real time;

[0026] S4: The rock retaining support moves forward in a step-by-step manner. During the forward movement of the rock retaining support, a second isolation device is arranged along the direction in which the first isolation device advances toward the working face.

[0027] In an optional embodiment, part of the first isolation device and the second isolation device along the width direction are located in the goaf, and part are located in the tunnel.

[0028] The beneficial effects of the present invention are:

[0029] (1) Compared with the traditional goaf-side tunneling technology, the isolation wall increases the flexible pressure relief space, reduces the instability and damage of the tunnel caused by high stress conditions, and at the same time, the flexible pressure relief space reduces the shear damage of the roof. It should be pointed out that in the early stage of tunneling, the increase in flexible pressure can ensure the bonding effect between the wall and the roof, avoid air leakage in the goaf, and facilitate the maintenance of the mine, especially improve the safety production of high-gas mines.

[0030] (2) Compared with the traditional gob-side tunnel retaining technology, the isolation wall is equipped with a pressure sensor to ensure the stability of the pressure inside the tire body and to inflate it in time when the air pressure drops; the piezoelectric sensor can monitor the pressure conducted by the roof in real time to ensure the strength of the isolation wall and further enhance mine safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic structural diagram of a support body of a piezoelectric carcass composite isolation wall device provided in one embodiment of the present invention.

[0033] Figure 2 A schematic structural diagram of a filling bag of a piezoelectric carcass composite isolation wall device provided in one embodiment of the present invention.

[0034] Figure 3 It is a schematic diagram of the carcass structure of a piezoelectric carcass composite isolation wall device provided in one embodiment of the present invention.

[0035] Figure 4 It is a schematic diagram of the circulation arrangement of a piezoelectric carcass composite isolation wall device provided in one embodiment of the present invention.

[0036] Among them, the figure markings are: 1-support body, 2-first groove, 3-piezoelectric sensor, 4-wire hole, 5-second groove, 6-mother puller, 7-support rod, 8-filling bag body, 9-sub-puller, 10-first drill hole, 11-second drill hole, 12-outer protective carcass, 13-inner carcass, 14-pressure sensor, 15-inflation hole, 16-tunnel, 17-first isolation device, 18-waste retaining bracket, 19-goaf, 20-working face advancement direction, 21-second isolation device. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] It should be noted that when a component is referred to as being "fixed to" or "affixed to" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, and "several" means any number including one, unless otherwise clearly and specifically defined.

[0039] Please see attached Figure 1-4The purpose of this embodiment is to provide a piezoelectric matrix composite isolation wall, including, characterized in that: a support body, a filling bag body 8 and a matrix; wherein the support body is a gate structure, the filling bag body is located at the bottom of the support body main body 1, and the matrix body is sleeved on the top of the support body main body 1; grouting is performed in the filling bag body 8, and air is inflated in the matrix body; a pressure sensor is provided on the top of the support body main body 1, and the pressure sensor is used to detect the pressure state of the filling bag body 8 after it is filled with a specified pressure. Compared with the traditional goaf-side lane retaining technology, the isolation wall increases the flexible pressure-relieving space to reduce the instability and damage of the lane due to high stress conditions, and at the same time, the flexible pressure-relieving space reduces the shear damage of the roof. It should be pointed out that in the early stage of the goaf retaining, the flexible pressure can be increased to ensure the bonding effect between the wall and the roof, avoid air leakage in the goaf, and facilitate the maintenance of the mine, especially to improve the safety production of high-gas mines.

[0040] Specifically, a plurality of first grooves 2 are evenly arranged on the top of the support body 1, and a pressure sensor 3 is arranged in each first groove 2. The pressure sensor is a piezoelectric sensor 3, and the lead of the piezoelectric sensor 3 is led out from the wire hole 4 on the support body 1. The support body 1 is also provided with a second groove 5, and a signal receiving module and a signal sending module are arranged in the second groove 5. The signal receiving module and the signal sending module can be Bluetooth modules, and the signal sending module is connected to the mine intelligent system.

[0041] Furthermore, the filling bag body 8 is a three-dimensional flexible bag, and a plurality of first boreholes 10 are arranged at a first height in the filling bag body 8, and the first boreholes 8 are used for grouting and gas extraction; a plurality of second boreholes 11 are arranged at a second height in the filling bag body 8, and the second boreholes 11 are used for anchoring. A sub-pull ring 9 is arranged at the upper top corner of the filling bag body 8, and the sub-pull ring 9 is connected to the main pull 6 on the support body 1. In this embodiment, the sub-pull 9 on the filling bag body 8 is connected to the main pull 6 on the support body 1, and the support rod 7 is welded to the support body 1 to increase the compressive resistance of the isolation wall. At least three first boreholes 10 are arranged along the upper end of the filling bag body 8 close to the support body 1, the left and right ends are grouting ports, the middle part is a gas extraction hole, and the second boreholes 11 are diffusely arranged along the middle part of the filling bag body 8, and the second boreholes 11 are anchor holes.

[0042] It should be pointed out that the carcass includes an outer protective carcass 12 and an inner carcass 13. The outer protective carcass 12 contacts the roof, and the inner carcass 13 contacts the support body 1 and the pressure sensor. The carcass is provided with an inflation hole 15 and a pressure sensor 14. The pressure sensor 14 is used to detect the pressure inside the carcass. The two sensors are connected to the intelligent system of the mine. The pressure sensor is added to the isolation wall to ensure the stability of the pressure inside the carcass and timely inflation when the air pressure decreases. The piezoelectric sensor can monitor the pressure conducted by the roof in real time to ensure the strength of the isolation wall and further enhance the safety of the mine.

[0043] When the piezoelectric carcass composite isolation wall is used, the following steps are included:

[0044] S1: Coal mining operation is carried out along the working face advancement direction 20;

[0045] S2: Use the rock-blocking support 18 to prevent the goaf from collapsing and entering the tunnel 16;

[0046] S3: Arrange the first isolation device 17 along the advancing direction 20 of the working face, use the carcass, the support body and the filling bag body 8 to form the first isolation device 17, inject grout into the filling bag body 8 and anchor it to solidify, and inflate the carcass to a specified pressure;

[0047] At this time, the inner carcass 13 is in contact with the support body 1; the outer protective carcass 12 is in contact with the top plate; the pressure sensor on the support body 1 detects the pressure of the top plate on the carcass in real time;

[0048] When arranging, first arrange the support body 1 behind the advancing direction 20 of the working face. The height of the support body 1 is required to be greater than three quarters of the height of the tunnel 16 to ensure the support strength of the isolation device 17.

[0049] S4: The rock retaining support 18 moves forward in a step. During the forward movement of the rock retaining support 18, the second isolation device 21 is arranged along the first isolation device 17 in the advancing direction 20 toward the working face.

[0050] In this embodiment, the first isolation device 17 and the second isolation device 21 are partially located in the goaf along the width direction and partially located in the tunnel 16, completing the arrangement of the goaf-retaining tunnel isolation wall to isolate the gas in the goaf 19 from the impact on the next working face.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A piezoelectric matrix composite isolation wall, comprising: A support body, a filling bag body (8) and a carcass; wherein the support body is a door-type structure, the filling bag body is located at the bottom of the support body main body (1), and the carcass is sleeved on the top of the support body main body (1); Grouting is injected into the filling bag body (8), and air is inflated into the tire body; A pressure sensor is provided on the top of the support body (1), and the pressure sensor is used to detect the pressure state of the filling bag (8) after it is filled with a specified pressure.

2. The piezoelectric matrix composite isolation wall according to claim 1, characterized in that: A plurality of first grooves (2) are evenly arranged on the top of the support body (1), and one of the pressure sensors (3) is arranged in each of the first grooves (2).

3. The piezoelectric matrix composite isolation wall according to claim 2, characterized in that: The pressure sensor is a piezoelectric sensor (3), and the lead wire of the piezoelectric sensor (3) is led out from a wire hole (4) on the support body (1).

4. The piezoelectric matrix composite isolation wall according to claim 3, characterized in that: The support body (1) is also provided with a second groove (5), and a signal receiving module and a signal sending module are arranged in the second groove (5).

5. The piezoelectric matrix composite isolation wall according to claim 1, characterized in that: The filling bag body (8) is a three-dimensional flexible bag. The filling bag body (8) is arranged with a plurality of first drill holes (10) at a first height, and the first drill holes (8) are used for grouting and gas extraction; the filling bag body (8) is arranged with a plurality of second drill holes (11) at a second height, and the second drill holes (11) are used for anchoring.

6. The piezoelectric matrix composite isolation wall according to claim 1, characterized in that: A sub-pull ring (9) is arranged at the upper corner of the filling bag body (8), and the sub-pull ring (9) is connected to the main pull ring (6) on the supporting body (1).

7. The piezoelectric matrix composite isolation wall according to claim 1, characterized in that: The carcass comprises an outer protective carcass (12) and an inner carcass (13), wherein the outer protective carcass (12) contacts the top plate, and the inner carcass (13) contacts the support body (1) and the pressure sensor.

8. The piezoelectric matrix composite isolation wall according to claim 7, characterized in that: The tire body is provided with an inflation hole (15) and a pressure sensor (14), and the pressure sensor (14) is used to detect the pressure inside the tire body.

9. A method for using the piezoelectric matrix composite isolation wall according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: coal mining operation is carried out along the advancing direction of the working face (20); S2: Use the rock-blocking support (18) to prevent the goaf from collapsing into the tunnel (16); S3: arranging a first isolation device (17) along the advancing direction (20) of the working face, using the carcass, the support body and the filling bag body (8) to form the first isolation device (17), injecting grout into the filling bag body (8) and anchoring and solidifying it, and inflating the carcass to a specified pressure; At this time, the inner carcass (13) is in contact with the support body (1); the outer protective carcass (12) is in contact with the top plate; the pressure sensor on the support body (1) detects the pressure of the top plate borne by the carcass in real time; S4: The rock-blocking support (18) moves forward in a step-by-step manner. During the process of the rock-blocking support (18) moving forward, a second isolation device (21) is arranged along the first isolation device (17) in the advancing direction (20) toward the working surface.

10. The method of use according to claim 9, characterized in that: Part of the first isolation device (17) and the second isolation device (21) along the width direction are located in the goaf, and part are located in the tunnel (16).

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