A method for monitoring leakage of underground filling pipelines

Abstract

The present invention relates to a method for monitoring leakage of an underground filling pipeline. A plurality of flow velocity sensors, several underground controllers and a ground monitoring center host are provided. The plurality of flow velocity sensors are arranged at intervals along the extending direction of the filling pipeline inside the filling pipeline to measure the horizontal flow velocity of the liquid and the vertical flow velocity of the solid at different cross-sections of the filling pipeline. Each flow velocity sensor is respectively connected to the corresponding underground controller through a signal line, and the underground controller is connected to the ground monitoring center host; the ground monitoring center host discovers the leakage of the filling pipeline and its occurrence location according to whether and the magnitude of the change in the ratio of the horizontal flow velocity of the liquid to the vertical flow velocity of the solid at each cross-section of the filling pipeline. This method is beneficial to automatically, real-timely and accurately discover the leakage of the underground filling pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline monitoring, and particularly relates to a method for monitoring leakage of underground filling pipelines. Background Art

[0002] In mines, the use of pipelines to transport filling slurry from the ground to underground goafs for filling has been widely applied. With the increase in the number of filling pipelines and the growth of their service time, coupled with the wear, corrosion of the filling slurry and the influence of the harsh underground environment during the operation of the filling pipelines, some pipeline leakage problems inevitably occur in the pipelines. Once leakage occurs in the underground filling pipelines, the resulting hazards include not only production stoppage and pipeline blockage, but more seriously, if the leakage point cannot be discovered and processed in time, a pipe burst and injury accident may occur. Therefore, it is very necessary to strengthen the monitoring of filling pipeline leakage.

[0003] There are many existing pipeline leakage monitoring technologies. Among them, acoustic detection methods are widely used in pipeline leakage detection systems, mainly including sound listening method, negative pressure wave correlation method, internal detection method, etc. In particular, a large number of pipeline leakage monitoring technologies have been developed using pipeline vibration models in oil pipelines. However, these pipeline leakage monitoring technologies cannot be applied to the leakage of underground filling pipelines. The main reasons are as follows: First, the material transported by the filling pipeline is a three-phase flow (solid, liquid, and gas); second, the filling pipeline is erected underground, and its environment is different from that of pipelines in other fields; third, the materials of pipelines on the same line are not the same.

[0004] Currently, the method for monitoring leakage of underground filling pipelines mainly relies on manual inspection of the pipelines to find out whether there is leakage. However, the deficiencies and defects of the existing manual inspection of pipelines for monitoring filling pipeline leakage are as follows: (1) Manual inspection cannot achieve real-time monitoring and full-time monitoring; (2) The filling pipelines are arranged in underground filling roadways, where the light is dim, and it is difficult for manual monitoring to detect small pipeline leaks; (3) There are some places in the roadways where the underground filling pipelines are erected that personnel cannot reach, and manual inspection cannot be realized. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for monitoring leakage of underground filling pipelines, which is conducive to automatically, real-time, and accurately discovering the leakage of underground filling pipelines.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: A method for monitoring leakage of underground filling pipelines, which sets multiple flow velocity sensors, several underground controllers, and a ground monitoring center host. The multiple flow velocity sensors are arranged at intervals along the extension direction of the filling pipeline inside the filling pipeline to measure the horizontal flow velocity of the liquid and the vertical flow velocity of the solid at different cross-sections of the filling pipeline. Each flow velocity sensor is respectively connected to the corresponding underground controller through a signal line, and the underground controller is connected to the ground monitoring center host; the ground monitoring center host discovers the leakage of the filling pipeline and its occurrence location according to whether and the magnitude of the change in the ratio of the horizontal flow velocity of the liquid to the vertical flow velocity of the solid at each cross-section of the filling pipeline.

[0007] Further, the flow velocity sensor is a bidirectional flow velocity sensor that can simultaneously measure the horizontal flow velocity of the liquid and the vertical flow velocity of the solid at any cross-section of the horizontally laid filling pipeline.

[0008] Further, the flow velocity sensor is set at a position between the center line of the pipeline and 1 / 4 of the diameter from the bottom of the pipeline, because the horizontal flow velocity of the liquid at this position is relatively stable, while the vertical flow velocity of the solid is the most sensitive.

[0009] Further, the first flow velocity sensor is arranged at a position 5 - 10 m away from the filling borehole connecting elbow, and the last flow velocity sensor is arranged at a position 5 - 10 m away from the filling pipeline discharge opening.

[0010] Further, the arrangement positions of other flow velocity sensors between the first flow velocity sensor and the last flow velocity sensor in the filling pipeline include:

[0011] (a) The position where the slope of the filling pipeline changes;

[0012] (b) Before and after the turning position in the horizontal filling pipeline;

[0013] (c) The position where the material of the filling pipeline changes;

[0014] (e) The position where leakage has occurred many times in the past;

[0015] (f) For a straight pipeline, a flow velocity sensor is set every 300 m.

[0016] Further, the ground monitoring center host calculates the horizontal flow velocity of the liquid and the vertical flow velocity of the solid measured by the first flow velocity sensor in the filling pipeline and the flow velocity ratio between the two, as well as the horizontal flow velocity of the liquid and the vertical flow velocity of the solid measured by the last flow velocity sensor and the flow velocity ratio between the two through the hydrodynamics of the filling slurry pipeline transportation according to the filling slurry concentration, the filling pipeline diameter, and the installation position of the flow velocity sensor, and then determines the reference value and the safety threshold based on the flow velocity ratios obtained by these two flow velocity sensors;

[0017] When the host computer of the ground monitoring center detects that the flow rate ratio obtained by the flow rate sensor is greater than the safety threshold, it is determined that there is a leakage in the filling pipeline; on this basis, the flow rate ratios obtained by the flow rate sensors adjacent to this flow rate sensor are extracted, and the pipe section with leakage is determined according to the magnitude of the change of each flow rate ratio compared with the reference value.

[0018] Furthermore, the installation method of the flow rate sensor in the filling pipeline is as follows: first, the flow rate sensor is fixedly installed on the inner side of the filling pipeline, then a hole is drilled in the filling pipeline, the flow rate sensor is connected to the signal line outside the pipe through the hole, and then the pipeline hole is sealed by spot welding and the signal line is fixed.

[0019] Furthermore, a snap ring is installed every 5 meters along the extension direction of the outer wall of the filling pipeline for laying and positioning the signal line; the distance between the signal line and the outer wall of the filling pipeline is 200 mm.

[0020] Compared with the prior art, the present invention has the following beneficial effects: a method for monitoring leakage of underground filling pipelines is provided. Based on the principle that leakage of the filling pipeline will cause disorders in the liquid horizontal flow rate and the solid vertical flow rate, the flow rate sensors are used to monitor the changes in the liquid horizontal flow rate, the solid vertical flow rate and their ratios in the filling pipeline. Therefore, it can not only realize the real-time monitoring and full-time monitoring of the underground filling pipeline system in the mine, and the filling roadway does not require a special lighting system to monitor the pipeline, small pipeline leaks can be detected in time and the leakage location can be determined, but also realize the unmanned automatic inspection and intelligent monitoring of the underground filling pipeline. The monitoring system is simple, stable and safe. Therefore, the present invention has strong practicability and broad application prospects. Description of the Drawings

[0021] Figure 1 is the implementation schematic diagram of the embodiment of the present invention.

[0022] In the figure: 1-underground filling pipeline; 2-vertical filling pipe of filling borehole; 3-signal line connecting the flow rate sensor; 4-connecting elbow of filling borehole; 5-underground controller; 6-host computer of ground monitoring center; 7-ground of filling station; 8-first flow rate sensor; 9-flow rate sensor; 10-last flow rate sensor; 11-material discharging port of filling pipeline. Detailed Embodiments

[0023] The present invention will be further described below in conjunction with the drawings and embodiments.

[0024] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0025] 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, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] The filling slurry is generally a mixed three-phase body composed of solids, liquids, and gases; under normal circumstances, the filling slurry flows in the filling pipeline, and the ratio of the horizontal flow velocity of the liquid to the vertical velocity of the solid at any cross-section of the pipeline has a certain pattern. If there is a leakage in the filling pipeline, it will inevitably cause changes in the flow rate and velocity of the gas and liquid in the pipeline, resulting in a disorder in the vertical descent velocity of the solid particles, and further leading to an irregular ratio of the horizontal flow velocity of the liquid to the vertical flow velocity of the solid. Based on this principle, the present invention proposes a method for monitoring leakage in underground filling pipelines.

[0027] Figure 1 is the implementation principle diagram of this embodiment. As Figure 1 shown, the method for monitoring leakage in underground filling pipelines provided in this embodiment sets multiple flow velocity sensors, several underground controllers 5, and a ground monitoring center host 6. The multiple flow velocity sensors are arranged at intervals along the extension direction of the filling pipeline inside the filling pipeline 1 to measure the horizontal flow velocity of the liquid and the vertical flow velocity of the solid at different cross-sections of the filling pipeline. Each flow velocity sensor is respectively connected to the corresponding underground controller 5 through a signal line 3 to transmit the detection signal of the flow velocity sensor to the underground controller 5, and the underground controller 5 is connected to the ground monitoring center host 6; the ground monitoring center host 6 discovers the leakage and its location in the filling pipeline according to whether and the magnitude of the change in the ratio of the horizontal flow velocity of the liquid to the vertical flow velocity of the solid at each cross-section of the filling pipeline. In this embodiment, only one underground controller 5 is set.

[0028] In this embodiment, the flow velocity sensor is a bidirectional flow velocity sensor that can simultaneously measure the horizontal flow velocity of the liquid and the vertical flow velocity of the solid at any cross-section of the horizontally laid filling pipeline.

[0029] In this embodiment, the flow velocity sensor is set at a position between the center line of the pipeline and 1 / 4 of the diameter from the bottom of the pipeline, because the horizontal flow velocity of the liquid at this position is relatively stable, while the vertical flow velocity of the solid is the most sensitive.

[0030] In this embodiment, the installation method of the flow rate sensor in the filling pipeline is as follows: First, fixedly install the flow rate sensor inside the filling pipeline, then drill a hole in the filling pipeline, connect the flow rate sensor to the signal line outside the pipe through the drilled hole, and then seal the drilled hole in the pipeline and fix the signal line by spot welding.

[0031] In this embodiment, a snap ring is installed every 5 meters along the extension direction of the outer wall of the filling pipeline for laying and positioning the signal line; the distance between the signal line and the outer wall of the filling pipeline is about 200 mm.

[0032] In this embodiment, the first flow rate sensor 8 is arranged about 5 - 10 m away from the filling borehole connecting elbow 4, where the flow rate is relatively stable and can be used as a benchmark for leakage judgment, and the data of the subsequent flow rate sensors are compared with it; the last flow rate sensor 10 is arranged about 5 - 10 m away from the filling pipeline discharge port 11. Generally, the horizontal flow rate is slow and the vertical flow is disordered at this position, and the measured value of this flow rate sensor is an important reference for comparison.

[0033] The arrangement positions of the other flow rate sensors 9 between the first flow rate sensor 8 and the last flow rate sensor 10 in the filling pipeline include:

[0034] (a) The position where the slope changes in the filling pipeline.

[0035] (b) Before and after the turning position in the horizontal filling pipeline.

[0036] (c) The position where the filling pipeline material changes, such as a steel pipe connected to a plastic pipe behind. Due to the use of pipes of different materials at these connection positions, the mechanics of solid particles colliding with the pipe wall are different.

[0037] (e) The positions where leakage has occurred many times in the past;

[0038] (f) For a straight pipeline, a flow rate sensor is set every 300 m.

[0039] The ground monitoring center host calculates, based on the filling slurry concentration, the filling pipeline diameter, and the installation positions of the flow rate sensors, the horizontal flow rate of the liquid and the vertical flow rate of the solid and the flow rate ratio between the two measured by the first flow rate sensor in the filling pipeline, as well as the horizontal flow rate of the liquid and the vertical flow rate of the solid and the flow rate ratio between the two measured by the last flow rate sensor through the hydrodynamics of fluid transportation in the filling slurry pipeline, and then determines the reference value and the safety threshold based on the flow rate ratios obtained from these two flow rate sensors.

[0040] When the host computer of the ground monitoring center finds that the flow rate ratio obtained by a flow rate sensor is greater than the safety threshold, it is determined that there is a leakage in the filling pipeline; on this basis, the flow rate ratios obtained by the flow rate sensors adjacent to this flow rate sensor are extracted, and the pipe section where the leakage occurs is determined according to the magnitude of the change of each flow rate ratio compared with the reference value.

[0041] During operation, the filling slurry enters the filling borehole from the ground of the filling station, and part of the air enters the borehole accordingly. After passing through the vertical borehole, the filling slurry flows through the connecting elbow and reaches the underground horizontal filling pipeline, and flows in the horizontal pipeline at a certain speed due to the height difference. In this method, flow rate sensors are arranged along the horizontal pipeline. The horizontal flow rate of the liquid and the vertical speed of the solid on the cross-section of the flow rate sensor are transmitted to the underground controller through the signal lines arranged outside the pipe. After receiving the data of all flow rate sensors, the underground controller uploads it to the host computer of the ground monitoring center, and the host computer of the ground monitoring center controls and interacts with the underground controller. When there is a leakage in the pipeline near the cross-section of a certain flow rate sensor, it will inevitably lead to an extreme change in the ratio of the horizontal speed to the vertical speed. The host computer of the ground monitoring center immediately judges the pipeline leakage and alarms according to this change.

[0042] The implementation steps of this method are as follows:

[0043] (1)Monitoring preparation work for the filling pipeline

[0044] The main preparation work includes: mastering the hydrodynamic properties of the filling slurry, and mastering the underground filling pipeline system, including: pipeline slope and turning positions, filling pipeline material conditions, historical operation conditions of the filling pipeline, etc.

[0045] (2)Selection of measuring points for the filling pipeline

[0046] The selection of the measuring points for the filling pipeline needs to refer to the erection drawing of the underground filling pipeline system and the filling pipeline materials, and at the same time combine the historical operation conditions of the filling pipeline to be monitored.

[0047] The specific layout positions of the flow rate sensors in the filling pipeline are as described above.

[0048] (3)Installation of the flow rate sensor

[0049] Fix the flow rate sensor inside the filling pipeline, at a position between the center line of the filling pipeline and 1 / 4 of the diameter at the bottom. The fixing method of the flow rate sensor in the filling pipeline is: first fix the flow rate sensor inside the filling pipeline, then drill holes in the filling pipeline, connect the flow rate sensor with the signal line outside the pipe, and then seal the pipeline and fix the signal line by spot welding.

[0050] (4)Determination of the safety threshold and system debugging

[0051] First, based on the diameter of the filling pipeline, the slurry concentration, and the height of the filling borehole, the horizontal flow velocity of the liquid, the vertical flow velocity of the solid, and the flow velocity ratio of the two measured by the first flow velocity sensor in the filling pipeline are calculated using the hydrodynamics of the filling slurry pipeline, as well as the horizontal flow velocity of the liquid, the vertical flow velocity of the solid, and the flow velocity ratio of the two measured by the last flow velocity sensor. Then, based on the flow velocity ratios obtained from these two flow velocity sensors, the reference value and the safety threshold are determined.

[0052] (5) Implementation of filling pipeline monitoring

[0053] After the filling starts, the host computer of the ground monitoring center monitors the information of each measuring point in real time. The staff can select a certain measuring point to understand the changes of this measuring point over a period of time. At the same time, the historical alarm records can be viewed to understand which positions in the filling pipeline are prone to leakage. Appropriate measuring points can be added at these positions, and more stable materials can be used for the filling pipeline at these positions.

[0054] The following further illustrates this method with a specific embodiment.

[0055] The filling of a certain copper mine adopts the full tailings cemented filling process, with gravity flow transportation. The filling slurry concentration is 75%, and the slurry density is 1.59 t / m 3 . The vertical borehole height is 310 m, the underground horizontal pipeline transportation distance is about 1,600 m, and the pipe diameter is φ150 / φ125 mm.

[0056] The implementation steps for monitoring the leakage of the underground pipeline in this mine's filling are as follows:

[0057] (1) Preparation work for filling pipeline monitoring

[0058] The main preparation work includes: mastering the hydrodynamics properties of the filling slurry, including slurry concentration, density, the particle size of the tailings less than 400 mesh, the sedimentation coefficient of 0.05, etc. The air mixed in the filling pipeline of this mine accounts for about 0.1% of the pipeline volume; mastering the underground filling pipeline system, including: mastering the pipeline slope and turning positions, the situation of the filling pipeline materials, the historical operation situation of the filling pipeline, etc.

[0059] (2) Selection of filling pipeline measuring points

[0060] The selection of filling pipeline measuring points needs to refer to the erection drawing of the underground filling pipeline system and the filling pipeline materials, and at the same time combine the historical operation situation of the filling pipeline to be monitored.

[0061] The first sensor measuring point must be arranged 6 m away from the connecting elbow of the filling borehole; the last flow velocity sensor must be arranged about 8 m away from the filling pipeline discharge port.

[0062] The intermediate measuring points are:

[0063] a. At position 2 with a slope change.

[0064] b. There are a total of 3 measuring points set at the pipe bends.

[0065] c. The filling pipe material is all cast iron pipes without material change.

[0066] d. There are 2 positions where leakage often occurred historically.

[0067] e. For straight pipes, a measuring point is selected every 300m.

[0068] (3)Equipment installation

[0069] Installation of flow velocity sensing equipment: Install a flow velocity sensor at each measuring point. Fix the flow velocity sensor inside the filling pipe, at a position between the center line of the filling pipe and 1 / 4 of the diameter from the bottom. The fixing method of the flow velocity sensor inside the filling pipe is to first fix the sensor on the inner side of the filling pipe, then drill holes in the filling pipe, connect the sensor to the signal line outside the pipe, and then seal the pipe and fix the signal line by spot welding.

[0070] Install two buckle rings on the outer wall of the filling pipe every 5 meters, respectively used for laying the data signal transmission line. Lay it parallel to the filling pipe, and the distance between the signal line and the outer wall of the pipe is about 200mm. Connect the output port of the flow velocity sensor to the data transmission line. Connect the underground controller and the ground host line well.

[0071] (4)Determination of safety threshold and system debugging

[0072] The host system software calculates the ratio of the flow velocities of the first and last flow velocity sensor sections according to the hydrodynamic properties of the mine filling pulp and using mechanical empirical formulas; then measures the horizontal and vertical flow velocities of the first flow velocity sensor and the sensor at the last discharging port section; and then combines the theoretical calculation and the actual measurement to fit the safety threshold. The safety threshold of this mine is 0.7 - 0.9, and an alarm will be issued if it is not within this range.

[0073] (5)Implementation of filling pipe monitoring

[0074] After the filling starts, the host of the filling monitoring center monitors the information of each measuring point in real time. The staff can select a certain measuring point to understand the changes of this measuring point over a period of time. At the same time, they can view the historical alarm records to understand which positions in the filling pipe are prone to leakage, add appropriate measuring points at these positions, and use more stable materials for the filling pipes at these positions.

[0075] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0076] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of the flows and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0077] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0078] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0079] As described above, it is only the preferred embodiments of the present invention, and it is not a limitation of the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A method for monitoring leakage of underground filling pipelines, characterized in that, a plurality of flow velocity sensors, several underground controllers and a ground monitoring center host are provided. The plurality of flow velocity sensors are arranged at intervals along the extension direction of the filling pipeline inside the filling pipeline to measure the horizontal flow velocity of the liquid and the vertical flow velocity of the solid at different cross-sections of the filling pipeline. Each flow velocity sensor is respectively connected to the corresponding underground controller through a signal line, and the underground controller is connected to the ground monitoring center host; the ground monitoring center host discovers the leakage of the filling pipeline and its occurrence location according to whether and the magnitude of the change in the ratio of the horizontal flow velocity of the liquid to the vertical flow velocity of the solid at each cross-section of the filling pipeline.

2. The method for monitoring leakage of underground filling pipelines according to claim 1, characterized in that, the flow velocity sensor is a bidirectional flow velocity sensor that can simultaneously measure the horizontal flow velocity of the liquid and the vertical flow velocity of the solid at any cross-section of the horizontally laid filling pipeline.

3. The method for monitoring leakage of underground filling pipelines according to claim 1, characterized in that, the flow velocity sensor is arranged at a position between the lower part of the pipeline center line and 1 / 4 of the diameter from the bottom of the pipeline.

4. The method for monitoring leakage of underground filling pipelines according to claim 1, characterized in that, the first flow velocity sensor is arranged at a position 5-10 m away from the filling borehole connection elbow, and the last flow velocity sensor is arranged at a position 5-10 m away from the filling pipeline discharge port.

5. The method for monitoring leakage of underground filling pipelines according to claim 4, characterized in that, the arrangement positions of the other flow velocity sensors between the first flow velocity sensor and the last flow velocity sensor in the filling pipeline include: (a) the position where the slope of the filling pipeline changes; (b) before and after the turning position in the horizontal filling pipeline; (c) the position where the material of the filling pipeline changes; (e) the position where leakage has occurred many times in the past; (f) for a straight pipeline, a flow velocity sensor is set every 300 m.

6. The method for monitoring leakage of underground filling pipelines according to claim 1, characterized in that, the ground monitoring center host calculates the horizontal flow velocity of the liquid and the vertical flow velocity of the solid measured by the first flow velocity sensor in the filling pipeline and the flow velocity ratio of the two, as well as the horizontal flow velocity of the liquid and the vertical flow velocity of the solid measured by the last flow velocity sensor and the flow velocity ratio of the two through the hydrodynamic calculation of the fluid transported by the filling material slurry pipeline according to the filling material slurry concentration, the filling pipeline diameter, and the installation position of the flow velocity sensor, and then determines the reference value and the safety threshold based on the flow velocity ratios obtained by these two flow velocity sensors; when the ground monitoring center host discovers that the flow velocity ratio obtained by a flow velocity sensor is greater than the safety threshold, it is determined that the filling pipeline has leaked; on this basis, the flow velocity ratios obtained by the flow velocity sensors adjacent to this flow velocity sensor are extracted, and the pipe section where the leakage occurs is determined according to the magnitude of the change of each flow velocity ratio compared with the reference value.

7. The method for monitoring leakage of underground filling pipelines according to claim 1, characterized in that, The installation method of the flow velocity sensor in the filling pipeline is as follows: First, fixedly install the flow velocity sensor on the inner side of the filling pipeline, then drill a hole in the filling pipeline, connect the flow velocity sensor to the signal line outside the pipe through the drilled hole, and then seal the drilled hole of the pipeline and fix the signal line by spot welding.

8. A method for monitoring leakage of an underground filling pipeline according to claim 1, characterized in that, a snap ring is installed every 5 meters along the extension direction of the filling pipeline on the outer wall of the filling pipeline for laying and positioning the signal line; the distance between the signal line and the outer wall of the filling pipeline is 200 mm.

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