CN217501750U - Caving method mine goaf roof caving development process monitoring device - Google Patents
Caving method mine goaf roof caving development process monitoring device Download PDFInfo
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- CN217501750U CN217501750U CN202221187560.9U CN202221187560U CN217501750U CN 217501750 U CN217501750 U CN 217501750U CN 202221187560 U CN202221187560 U CN 202221187560U CN 217501750 U CN217501750 U CN 217501750U
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Abstract
The utility model discloses a caving method mine goaf roof caving development process monitoring devices belongs to the mining engineering field, including main optical fiber (1), vice optical fiber (7) and pipeline (4) that are located drilling (14) to and be located optical fiber tester (13) outside drilling (14), the one end of main optical fiber (1) and vice optical fiber (7) is welded in drilling (14) bottom, and the other end extends to drilling (14) outside with optical fiber tester (13) are connected, main optical fiber (1) and vice optical fiber (7) pass through optical fiber fixing cutting ferrule (2) fixed connection at drilling (14) and the outer wall of pipeline (4); the utility model discloses a monitoring devices simple structure, use nimble, easy operation, to the strong adaptability of monitoring scene, optic fibre and PVC pipe low cost that the monitoring was used are applicable to popularization and application, because the monitoring personnel is at the development process of safe local remote diagnosis collecting space area roof caving, consequently the monitoring operation security obviously improves.
Description
Technical Field
The utility model relates to a mining engineering technical field especially relates to a caving method mine collecting space area roof caving development process monitoring devices.
Background
Along with the advance of mining operation in the caving method mining process, the exposure area in collecting space area will be bigger and bigger, will take place to fall after roof country rock loses the support. Roof wall rock typically develops upwards periodically in the form of an caving arch as mining operations are advanced until it bursts through the earth. The method has the advantages that the caving impact damage is easily generated to underground mining operation when large-scale roof surrounding rock caving occurs in the underground goaf, and the damage is easily generated to surface buildings and facilities when the roof surrounding rock caving penetrates through the surface of the ground, so that the monitoring of the caving development process of the roof in the goaf has important significance for the safety production of the caving method.
However, at present, manual measurement or micro-seismic monitoring of monitoring roadways is mostly adopted, the monitoring operation is directly carried out on the upper part of the caving area in the former method, great risks exist, and the monitoring system in the latter method is complex and has higher monitoring cost. Therefore, the safe, economic and practical monitoring device for the caving process of the top plate of the goaf is developed, and has great significance for guaranteeing the production safety of the caving method mine.
Disclosure of Invention
The utility model aims at providing a to the problem that present caving method mine goaf roof caving monitoring operation security is poor, monitoring cost height, provide one kind can be safe, economic, convenient monitoring caving method goaf roof caving process's device to the production safety in the guarantee caving method mine.
In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a caving method mine goaf roof caving development process monitoring devices, is including the main optical fiber, vice optic fibre and the pipeline that are located the drilling, still including being located the outer optic fibre tester of drilling, the one end of main optical fiber and vice optic fibre splice in the drilling bottom, the other end extend to the drilling outside with the optic fibre tester is connected, main optical fiber and vice optic fibre pass through optic fibre fixed cutting ferrule fixed connection at the outer wall of drilling and pipeline.
The two optical fibers are fixed on the outer wall of the pipeline through the optical fiber fixing clamping sleeve, and the two optical fibers are tested and verified mutually during monitoring, so that the reliability of a monitoring result is improved.
As a preferred technical scheme: the pipeline is divided into at least two sections, and two slurry overflow holes are formed in the middle pipe wall of each section of pipeline, and the slurry overflow holes are preferably circular. The pipeline is divided into a plurality of sections, so that the head part of each section of pipeline is processed into an external thread and the tail part of each section of pipeline is processed into an internal thread, and the pipelines are screwed together end to end in field operation; set up excessive thick liquid hole, its effect is when the slip casting with cement mortar injection pipeline in, cement mortar flows in the pipeline through these two excessive thick liquid holes when overflowing in getting into the drilling, draws slip casting pipe when can prevent directly injecting cement mortar in the drilling like this and makes optic fibre produce destruction, bending etc..
As a preferred technical scheme: two slurry overflow holes of each section of pipeline are penetrated in front and back. Cement mortar overflows more easily.
As a preferred technical scheme: the pipeline is a PVC pipe.
As a preferred technical scheme: the length of each section of pipeline is 0.5-2m, the inner diameter is 30-50mm, the wall thickness is 1-3mm, and the diameter of the pulp overflow hole is 15-30 mm.
As a preferred technical scheme: the optical fiber fixing clamp sleeve is formed by fixing a rubber ring and two hard plastic rings together, and an opening is formed in each plastic ring. The opening is arranged so that optical fibers can be clamped into the opening, the rubber ring is sleeved on the pipeline when the optical fiber fixing clamp is used, and then the two monitoring optical fibers (the main optical fiber and the auxiliary optical fiber) are clamped into the plastic ring on the rubber ring, so that the optical fibers can be fixed on the pipeline, and meanwhile, the installation quantity and the installation positions of the optical fiber fixing clamp sleeves on each section of pipeline can be changed according to field requirements so as to ensure that the optical fibers can be stably fixed on the pipeline.
As a preferable technical scheme: the optical fiber protection tube is further included, and one part of the main optical fiber and the auxiliary optical fiber which are positioned outside the drill hole is positioned in the optical fiber protection tube. The optical fiber outside the hole of the drill hole is sleeved into an optical fiber protection tube (preferably a PVC tube) for protection, is buried below the ground surface shallowly and is paved into a monitoring room established in a ground surface safety zone, so that the safety of operators during measurement is ensured, and the operators can monitor the optical fiber strain condition in the drill hole through an optical fiber tester in the monitoring room so as to analyze the caving development condition of the top plate of the goaf.
As a preferable technical scheme: and the main optical fiber and the auxiliary optical fiber are respectively provided with a hot application at the positions outside the drill hole and close to the drill hole. Before the first test, the accurate distance between the position of the optical fiber tester and the orifice of the drill hole needs to be determined by a hot compress method, so that the optical fiber strain data in the distance is eliminated in the later monitoring and diagnosis process, and only the optical fiber strain data in the drill hole is analyzed.
As a preferable technical scheme: the main optical fiber is a steel strand optical fiber; the secondary optical fiber is a fixed point optical fiber.
As a preferred technical scheme: still include the monitoring room, the optic fibre tester is located the monitoring indoor.
When the rock mass at the drilling part generates micro rock movement or cracks, the optical fibers (the main optical fiber and the auxiliary optical fiber) in the drilling hole generate tensile deformation, the position where the rock mass cracks can be determined according to the loss of the photoelectric pulse signal monitored by the optical fiber tester in the optical fiber transmission process, and the rock mass at the part can be judged to be about to fall off due to the micro cracks of the rock mass; when the rock mass takes place to fall, optic fibre can be broken by the stretch-breaking, because the fracture position can't transmit photoelectric pulse signal, can pass through the quick determination optic fibre fracture position of optic fibre tester this moment, with the fracture position below attributing to the region that has taken place to fall. The test results of the two optical fibers can be verified mutually, so that the accuracy of the monitoring result is improved. The caving development process of the surrounding rock of the top plate of the goaf can be mastered by regularly monitoring and diagnosing the damage condition of the optical fiber in the drill hole in the ground surface monitoring room. The monitoring device has a series of advantages of simple structure, low cost, safe operation, reliable monitoring result and the like.
Compared with the prior art, the utility model has the advantages of: the utility model discloses a monitoring devices simple structure, use nimble, easy operation, to the strong adaptability of monitoring scene, optic fibre and PVC pipe low cost that the monitoring was used are applicable to popularization and application, in addition, because the monitoring personnel is at the development process that safe local remote diagnosis collecting space area roof caving, consequently the monitoring operation security obviously improves.
Drawings
Fig. 1 is a structural diagram of a monitoring device according to an embodiment of the present invention;
FIG. 2 is an enlarged view of the portion A of FIG. 1;
fig. 3 is a schematic diagram of monitoring a goaf caving process by using the monitoring device of fig. 1.
In the figure: 1. a main optical fiber; 2. an optical fiber fixing ferrule; 3. a slurry overflow hole; 4. a pipeline; 5. cement mortar; 6. surrounding rocks; 7. a secondary optical fiber; 8. hot application; 9. An optical fiber protection tube; 10. a PVC pipe junction; 11. the primary and secondary optical fibers are welded; 12. a monitoring room; 13. an optical fiber tester; 14. drilling; a. penetrating the crack; b. fissures, c, falling bulk; d. crack expansion; e. a loosening zone; f. blast holes; g. and (5) extracting direction.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Example (b):
referring to fig. 1 and 2, a caving method mine goaf roof caving development process monitoring device comprises a main optical fiber 1, an auxiliary optical fiber 7 and a pipeline 4 which are positioned in a drill hole 14, and further comprises an optical fiber tester 13 which is positioned outside the drill hole 14, wherein one end of the main optical fiber 1 and one end of the auxiliary optical fiber 7 are welded to the bottom of the drill hole 14, namely a welding position 11 of the main optical fiber and the auxiliary optical fiber in fig. 1, the other end of the main optical fiber and the auxiliary optical fiber extends out of the drill hole 14 and is connected with the optical fiber tester 13, and the main optical fiber 1 and the auxiliary optical fiber 7 are fixedly connected with the outer wall of the pipeline 4 through an optical fiber fixing clamping sleeve 2 in the drill hole 14;
in this embodiment, the main optical fiber 1 is a steel stranded fiber; the auxiliary optical fiber (7) is a fixed-point optical fiber;
in the embodiment, the pipeline 4 is divided into three sections, two circular slurry overflow holes 3 are formed in the middle pipe wall of each section of pipeline, the two slurry overflow holes 3 of each section of pipeline 4 penetrate through the pipeline 4 from front to back, the pipeline 4 is a PVC pipe, the length of each section of pipeline 4 is 1m, the inner diameter of each section of pipeline is 40mm, the wall thickness of each section of pipeline is 2mm, and the diameter of each slurry overflow hole 3 is 20 mm.
In the embodiment, the optical fiber fixing ferrule 2 is formed by fixing a rubber ring and two hard plastic rings together, and the plastic rings are provided with an opening;
in the embodiment, the optical fiber protection tube 9 is further included, and a part of the main optical fiber 1 and the secondary optical fiber (7) outside the borehole 4 is positioned in the optical fiber protection tube 9;
the main optical fiber 1 and the auxiliary optical fiber 7 are respectively provided with a hot application 8 at the positions outside the drill hole 14 and close to the drill hole 14;
and a monitoring chamber 12, wherein the optical fiber tester 13 is positioned in the monitoring chamber 12,
a schematic diagram of detection by using the monitoring device is shown in fig. 3, four groups of the monitoring devices are shown in fig. 3, a is a through fracture, b is a fracture, c is an caving body, d is fracture expansion, e is a loosening area, f is a blast hole, and g is a recovery direction, and the construction and monitoring method comprises the following steps:
(1) one or a plurality of monitoring drill holes 14 (the number of the drill holes is determined according to the actual monitoring requirement) are directionally constructed towards the underground goaf (namely the surrounding rock 6) on the earth surface, the diameter of each drill hole is preferably 70-90 mm, and the hole bottoms of the drill holes 14 are close to the top plate of the goaf as much as possible but are not penetrated through the goaf;
(2) laying a main optical fiber 1 (5 mm steel strand optical fiber) and an auxiliary optical fiber 7 (2 m fixed point optical fiber) along a PVC pipe (namely a pipeline 4), fixing the main optical fiber and the auxiliary optical fiber on the first section of PVC pipe through an optical fiber fixing clamping sleeve 2, then fusing the two optical fibers together at the head end position of the first section of PVC pipe and fixing the two optical fibers at a main and auxiliary optical fiber fusion joint 11, then tightly twisting and connecting the second section of PVC pipe and the first section of PVC pipe at a PVC pipe joint 10, and fixing the main and auxiliary optical fibers on the second section of PVC pipe through the optical fiber fixing clamping sleeve 2, and repeating the operation until the PVC pipe and the test optical fiber are laid along the whole length of a drill hole 14;
(3) in order to prevent the subsequent monitoring that the test optical fiber is damaged and influenced by pulling the grouting pipe when the grouting pipe is adopted to directly perform grouting into the drill hole 14, the grouting pipe is inserted into the PVC pipe for grouting operation, cement mortar 5 slowly flows into the drill hole 14 through the grout overflow hole 3 on the pipe wall of the PVC pipe when flowing in the PVC pipe, so that the optical fiber and the PVC pipe are solidified in the drill hole 14, and the on-site grouting is performed until the drill hole is filled;
(4) sleeving the optical fiber outside the drill hole 14 into an optical fiber protection tube 9 made of PVC material to protect the optical fiber, burying the optical fiber below the ground surface in a shallow mode, and paving the optical fiber until the optical fiber is built in a monitoring room 12 of a ground surface safety part and connected with an optical fiber tester 13;
(5) before the first test, the accurate distance between the position of the optical fiber tester and the orifice of the drill hole needs to be determined, so that the optical fiber change in the distance is eliminated in the later monitoring and diagnosis process, and only the optical fiber optical signal in the drill hole is analyzed: the method comprises the steps that 1m long hot application 8 is laid on a main testing optical fiber at the orifice of a drill hole, so that the temperature of the optical fiber rises and is strained, the distance of hot application points of the orifice is tested by inputting photoelectric pulse signals through the main optical fiber and an auxiliary optical fiber respectively, and then the distance between the two optical fibers at the orifice and an optical fiber tester can be obtained according to the length of the drill hole and the length of the optical fiber fed into the drill hole;
(6) in the underground caving mining process, deformation and damage conditions of the main optical fiber and the auxiliary optical fiber in the drill hole are regularly monitored and diagnosed in an earth surface monitoring chamber, and a caving development process of a top plate of the goaf is drawn according to a monitoring result.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a caving method mine goaf roof caving development process monitoring devices which characterized in that: including main optical fiber (1), vice optic fibre (7) and pipeline (4) that are located drilling (14), still including being located drilling (14) outer optic fibre tester (13), the one end of main optical fiber (1) and vice optic fibre (7) weld in drilling (14) bottom, the other end extend to drilling (14) outer with optic fibre tester (13) are connected, main optical fiber (1) and vice optic fibre (7) pass through optic fibre fixed cutting ferrule (2) fixed connection at the outer wall of drilling (14) and pipeline (4).
2. The caving method mine gob roof caving development process monitoring device according to claim 1, characterized in that: the pipeline (4) is at least divided into two sections, and two slurry overflow holes (3) are formed in the middle pipe wall of each section of pipeline.
3. The caving method mine goaf roof caving development process monitoring device according to claim 2, characterized in that: the two slurry overflow holes (3) of each section of pipeline (4) are penetrated in front and back.
4. The caving method mine gob roof caving development process monitoring device according to claim 1, characterized in that: the pipeline (4) is a PVC pipe.
5. The caving method mine gob roof caving development process monitoring device according to claim 2, characterized in that: the length of each section of pipeline (4) is 0.5-2m, the inner diameter is 30-50mm, the wall thickness is 1-3mm, and the diameter of the grout overflow hole (3) is 15-30 mm.
6. The caving method mine gob roof caving development process monitoring device according to claim 1, characterized in that: the optical fiber fixing clamp sleeve (2) is formed by fixing a rubber ring and two hard plastic rings together, and an opening is formed in each plastic ring.
7. The caving method mine gob roof caving development process monitoring device according to claim 1, characterized in that: the optical fiber protection tube (9) is further included, and a part, outside the drill hole (14), of the main optical fiber (1) and the auxiliary optical fiber (7) is located in the optical fiber protection tube (9).
8. The caving method mine gob roof caving development process monitoring device according to claim 1, characterized in that: and hot application pastes (8) are respectively arranged at the positions, close to the drill hole (14), of the main optical fiber (1) and the auxiliary optical fiber (7) outside the drill hole (14).
9. The caving method mine gob roof caving development process monitoring device according to claim 1, characterized in that: the main optical fiber (1) is a steel strand optical fiber; the secondary optical fiber (7) is a fixed point optical fiber.
10. The caving method mine gob roof caving development process monitoring device according to claim 1, characterized in that: the optical fiber tester also comprises a monitoring chamber (12), and the optical fiber tester (13) is positioned in the monitoring chamber (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221187560.9U CN217501750U (en) | 2022-05-18 | 2022-05-18 | Caving method mine goaf roof caving development process monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221187560.9U CN217501750U (en) | 2022-05-18 | 2022-05-18 | Caving method mine goaf roof caving development process monitoring device |
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| Publication Number | Publication Date |
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| CN217501750U true CN217501750U (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221187560.9U Active CN217501750U (en) | 2022-05-18 | 2022-05-18 | Caving method mine goaf roof caving development process monitoring device |
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- 2022-05-18 CN CN202221187560.9U patent/CN217501750U/en active Active
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