Coal mine underground anchor rod and anchor cable stress corrosion monitoring system

Abstract

The invention provides a coal mine underground anchor rod and anchor cable stress corrosion monitoring system. The monitoring system comprises a stress corrosion monitoring system, an underground atmospheric environment monitoring subsystem, an underground water environment monitoring subsystem and a stress monitoring subsystem. The atmospheric environment monitoring subsystem is used for monitoring atmospheric corrosion factors in an underground coal mine anchor rod and anchor cable working environment; the underground water environment monitoring subsystem is used for monitoring corrosion factors in coal mine underground anchor rod and anchor cable working environment water; the stress monitoring subsystem is used for monitoring stress and strain changes of an underground coal mine anchor rod and anchor cable in a working state and stress and displacement conditions of surrounding rock in an anchor rod and anchor cable supporting area; according to the scheme provided by the invention, the corrosion factors and the rock mass stress of the service environment of the anchor rod and the anchor cable can be efficiently monitored, the stress corrosion damage of the anchor rod and the anchor cable is effectively monitored, and safe production of a coal mine is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of stress corrosion monitoring of anchor rods and anchor cables in coal mines, and in particular relates to a stress corrosion monitoring system for anchor rods and anchor cables in coal mines. Background Art

[0002] As coal mining continues to move deeper, the mining environment becomes increasingly harsh, resulting in increased corrosion of underground coal mine support systems. Most support materials are damaged prematurely before reaching their destructive strength and service life. Support failure threatens the lives of underground workers, affects mine safety, and reduces coal mine production efficiency. There are two main reasons for the increased corrosion of support materials: on the one hand, there are objective reasons. With the increase in mining depth, the occurrence environment of deep coal mining is high geothermal temperature, high geostress, high karst water pressure and strong mining disturbance. The surrounding rock stress borne by the support system increases, the corrosive gas in the underground atmospheric environment increases, and the corrosive ions in the underground water environment increase, which leads to the accelerated corrosion rate of the support system; on the other hand, there are subjective reasons. Prestressed anchoring materials are mainly used for underground support in coal mines, such as prestressed anchor rods, prestressed anchor cables, etc. Prestressed anchor rods and cables are applied with pre-tightening force during installation to enhance the support capacity of the rock mass, which leads to the aggravation of stress corrosion of anchor rods and cables. At the same time, the manufacturing process of high-strength and low-toughness anchor rods and cables, such as cold-drawn steel process, will make them more susceptible to stress corrosion and hydrogen embrittlement.

[0003] Under the dual effects of corrosion factors and stress, the stress corrosion rate of anchor bolts and cables is accelerated, the degree of corrosion is aggravated, and the support life is shortened. Stress corrosion failure of anchor bolts and cables accounts for the majority of support failures. Monitoring and prevention of stress corrosion of anchor bolts and cables has become a top priority in mine support, but there are almost no monitoring and early warning measures for stress corrosion of anchor bolts and cables in coal mines. Therefore, how to accurately and efficiently monitor the stress corrosion of anchor bolts and cables in coal mines has become an urgent problem to be solved in this field.

[0004] Based on the above technical problems existing in underground coal mines, there is no relevant solution yet; therefore, there is an urgent need to find effective solutions to solve the above problems. Summary of the invention

[0005] In view of the deficiencies in the above technologies, the present invention proposes a stress corrosion monitoring system for anchor rods and cables in coal mines, aiming to solve the technical problems of aggravated stress corrosion of anchor rods and cables in existing coal mines and lack of monitoring means.

[0006] The present invention provides a stress corrosion monitoring system for anchor rods and cables in underground coal mines. The monitoring system comprises a stress corrosion monitoring system, an underground atmospheric environment monitoring subsystem, an underground water environment monitoring subsystem and a stress monitoring subsystem; the atmospheric environment monitoring subsystem is connected with the stress corrosion monitoring system; the atmospheric environment monitoring subsystem is used to monitor atmospheric corrosion factors in the working environment of anchor rods and cables in underground coal mines; the underground water environment monitoring subsystem is connected with the stress corrosion monitoring system; the underground water environment monitoring subsystem is used to monitor corrosion factors in the water in the working environment of anchor rods and cables in underground coal mines; the stress monitoring subsystem is connected with the stress corrosion monitoring system; the stress monitoring subsystem is used to monitor stress and strain changes in the working state of anchor rods and cables in underground coal mines and stress and displacement of surrounding rocks in the anchor rod and cable support area.

[0007] Furthermore, the atmospheric environment monitoring subsystem monitors the atmospheric corrosion factors in the working environment of anchor rods and cables in coal mines through its multiple sensors; the multiple sensors include SO2 sensors, H2S sensors, Cl2 sensors, NO2 sensors, CO2 sensors, O3 sensors, temperature sensors and humidity sensors; the SO2 sensor is used to measure the corrosive gas SO2 in the atmospheric environment of the working area of ​​anchor rods and cables; the H2S sensor is used to measure the corrosive gas H2S in the atmospheric environment of the working area of ​​anchor rods and cables; the Cl2 sensor is used to measure the corrosive gas Cl2 in the atmospheric environment of the working area of ​​anchor rods and cables; the NO2 sensor is used to measure the corrosive gas NO2 in the atmospheric environment of the working area of ​​anchor rods and cables; the CO2 sensor is used to measure the corrosive gas CO2 in the atmospheric environment of the working area of ​​anchor rods and cables; the O3 sensor is used to measure the corrosive gas O3 in the atmospheric environment of the working area of ​​anchor rods and cables; the temperature sensor is used to measure the temperature in the atmospheric environment of the working area of ​​anchor rods and cables, and the humidity sensor is used to measure the humidity in the atmospheric environment of the working area of ​​anchor rods and cables.

[0008] Furthermore, the atmospheric environment monitoring subsystem is communicatively connected with No. 1 underground intrinsically safe switch via optical fiber, the No. 1 underground intrinsically safe switch is communicatively connected with the ground switch via optical fiber, and the ground switch is communicatively connected with the stress corrosion monitoring system via optical fiber; the SO2 sensor, H2S sensor, Cl2 sensor, NO2 sensor, CO2 sensor, O3 sensor, temperature sensor and humidity sensor are communicatively connected with the atmospheric environment monitoring subsystem via optical fiber respectively; the data detected by the SO2 sensor, H2S sensor, Cl2 sensor, NO2 sensor, CO2 sensor, O3 sensor, temperature sensor and humidity sensor are transmitted to the atmospheric environment monitoring subsystem via optical fiber; the atmospheric environment monitoring subsystem filters, denoises and normalizes the collected data and transmits it to No. 1 underground intrinsically safe switch via optical fiber, and the No. 1 underground intrinsically safe switch stores a copy of the pre-processed data and transmits it to the ground switch via optical fiber.

[0009] Furthermore, the underground water environment monitoring subsystem monitors the corrosion factors in the working environment water of the coal mine anchor bolts and cables through its multiple sensors; the multiple sensors include Cl - Sensor, SO4 2- Sensor, DO sensor and PH sensor; Cl - The sensor is used to measure the Cl in the water environment in the anchor cable working area. - Concentration; SO4 2- The sensor is used to measure the SO4 in the water environment of the anchor working area. 2- Concentration; DO sensor is used to measure the dissolved oxygen concentration of the water environment in the working area of ​​the anchor rod and cable; PH sensor is used to measure the pH value of the water environment in the working area of ​​the anchor rod and cable.

[0010] Furthermore, the underground water environment monitoring subsystem is connected to the No. 2 underground intrinsically safe switch through optical fiber, the No. 2 underground intrinsically safe switch is connected to the ground switch through optical fiber, and the ground switch is connected to the stress corrosion monitoring system through optical fiber; - Sensor, SO4 2- The sensor, DO sensor and PH sensor are respectively connected to the underground water environment monitoring subsystem through optical fiber; Cl - Sensor, SO4 2- The data detected by the sensor, DO sensor and PH sensor are transmitted to the underground water environment monitoring subsystem via optical fiber; the underground water environment monitoring subsystem filters, denoises and normalizes the collected data and transmits it to the No. 2 underground intrinsically safe switch via optical fiber, and the No. 2 underground intrinsically safe switch stores a copy of the pre-processed data and transmits it to the ground switch via optical fiber.

[0011] Furthermore, the stress monitoring subsystem monitors the stress and strain changes under the working state of the anchor rods and cables in the coal mine and the stress and displacement of the surrounding rock in the anchor rod and cable support area through its multiple sensors; the multiple sensors include anchor rod stress sensors, anchor cable stress sensors, anchor rod strain sensors, anchor cable strain sensors, rock stress sensors and multi-point rock displacement meters; the anchor rod stress sensor is used to monitor the stress changes of the anchor rod, the anchor cable stress sensor is used to monitor the stress changes of the anchor cable, the anchor rod strain sensor is used to monitor the strain changes of the anchor rod, the anchor cable strain sensor is used to monitor the strain changes of the anchor cable, the rock stress sensor is used to monitor the stress changes of the rock in the working area of ​​the anchor rod and cable, and the multi-point rock displacement meter is used to monitor the displacement changes of the rock in the area.

[0012] Furthermore, the stress monitoring subsystem is connected to the No. 3 underground intrinsically safe switch through optical fiber, the No. 3 underground intrinsically safe switch is connected to the ground switch through optical fiber, and the ground switch is connected to the stress corrosion monitoring system through optical fiber; the anchor stress sensor, anchor cable stress sensor, anchor strain sensor, anchor cable strain sensor, rock stress sensor and multi-point rock displacement meter are respectively connected to the underground water environment monitoring subsystem through optical fiber; the data of the anchor stress sensor, anchor cable stress sensor, anchor strain sensor, anchor cable strain sensor, rock stress sensor and multi-point rock displacement meter are transmitted to the stress monitoring subsystem through optical fiber; the stress monitoring subsystem filters, denoises and normalizes the collected data and transmits it to the No. 3 underground intrinsically safe switch through optical fiber, and the No. 3 underground intrinsically safe switch stores a copy of the pre-processed data and transmits it to the ground switch through optical fiber.

[0013] Furthermore, the monitoring system also includes a ground data analysis and decision-making subsystem, which is connected to the stress corrosion monitoring system through optical fiber; the ground data analysis and decision-making subsystem is used to analyze and process the data measured underground and transmitted to the ground switch, and compare the measured corrosion factor data and stress data with the threshold values ​​of each factor under stress corrosion failure conditions.

[0014] Furthermore, the atmospheric environment monitoring subsystem is electrically connected to the stress corrosion monitoring system through cables, and each sensor of the atmospheric environment monitoring subsystem is electrically connected to the atmospheric environment monitoring subsystem through cables; the underground water environment monitoring subsystem is electrically connected to the stress corrosion monitoring system through cables, and each sensor of the underground water environment monitoring subsystem is electrically connected to the underground water environment monitoring subsystem through cables; the stress monitoring subsystem is electrically connected to the stress corrosion monitoring system through cables, and each sensor of the stress monitoring subsystem is electrically connected to the stress monitoring subsystem through cables; each sensor can be detachably arranged underground in the coal mine, so as to adjust the installation spacing.

[0015] Furthermore, each downhole component of the monitoring system adopts an intrinsically safe component.

[0016] The coal mine underground anchor bolt and cable stress corrosion monitoring system provided by the present invention has the following beneficial effects: The solution provided by the present invention cleverly utilizes the anchor rod and anchor cable stress corrosion monitoring system to monitor the stress corrosion of anchor rods and anchor cables, filling the gap in stress corrosion monitoring of anchor rods and anchor cables in coal mines, and can accurately and efficiently monitor the stress and various corrosion factors in the working environment of anchor rods and anchor cables, avoid the failure of anchor rod and anchor cable support, protect the lives of workers, and ensure safe production in mines.

[0017] The present invention has high reliability and working continuity by designing the underground atmospheric environment monitoring subsystem, the underground water environment monitoring subsystem, the stress monitoring subsystem and the ground data analysis and decision-making subsystem to work in series and parallel, greatly simplifying the process and reducing component redundancy; multiple sensors are used to monitor various corrosion factors and stresses in the working environment of anchor rods and cables, fully considering various stress corrosion influencing factors in the service environment of anchor rods and cables in coal mines, and sensors can be flexibly added or removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 This is a schematic diagram of a stress corrosion monitoring system for anchor rods and cables in underground coal mines according to the present invention; Figure 2 This is a schematic diagram of a stress corrosion monitoring system for anchor rods and cables in underground coal mines according to the present invention; Figure 3 The present invention is a flow chart of a method for monitoring stress corrosion of anchor rods and anchor cables in underground coal mines.

[0020] In the figure: 1-coal mine safety dispatching command center; 2-stress corrosion monitoring department; 3-ground switch; 4-No. 1 underground intrinsically safe switch; 5-No. 2 underground intrinsically safe switch; 6-No. 3 underground intrinsically safe switch; 7-atmospheric environment monitoring substation; 8-SO2 sensor; 9-H2S sensor; 10-Cl2 sensor; 11-NO2 sensor; 12-CO2 sensor; 13-O3 sensor; 14-temperature sensor; 15-humidity sensor; 16-water environment monitoring substation; 17-PH sensor; 18-Cl - Sensor; 19-SO4 2- Sensor; 20-DO sensor; 21-stress monitoring substation; 22-stress sensor; 23-strain sensor; 24-rock stress sensor; 25-multi-point rock displacement meter; 26-cable; 27-optical fiber. DETAILED DESCRIPTION

[0021] 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 intended to limit the present invention.

[0022] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0024] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figure 1 and Figure 2As shown, the present invention provides a stress corrosion monitoring system for anchor rods and cables in coal mines, the monitoring system comprising a stress corrosion monitoring system, an underground atmospheric environment monitoring subsystem, an underground water environment monitoring subsystem and a stress monitoring subsystem; the atmospheric environment monitoring subsystem is connected to the stress corrosion monitoring system; the atmospheric environment monitoring subsystem is used to monitor the atmospheric corrosion factors in the working environment of anchor rods and cables in coal mines; the underground water environment monitoring subsystem is connected to the stress corrosion monitoring system; the underground water environment monitoring subsystem is used to monitor the corrosion factors in the water in the working environment of anchor rods and cables in coal mines; the stress monitoring subsystem is connected to the stress corrosion monitoring system; the stress monitoring subsystem is used to monitor the stress and strain changes in the working state of anchor rods and cables in coal mines and the stress and displacement of the surrounding rock in the anchor rod and cable support area; the stress corrosion monitoring system for anchor rods and cables in coal mines provided by the present invention can realize efficient and accurate monitoring of the corrosion factors and rock stress in the service environment of anchor rods and cables, effectively monitor the stress corrosion damage of anchor rods and cables, provide a theoretical basis for the early warning and prevention of stress corrosion failure of anchor rods and cables, and ensure the life safety of workers and the safety of mine production.

[0027] Preferably, in combination with the above scheme, Figure 1 and Figure 2 As shown, the atmospheric environment monitoring subsystem can be set up in the atmospheric environment monitoring substation 7, and the atmospheric environment monitoring subsystem monitors the atmospheric corrosion factors in the working environment of the anchor rods and cables in the coal mine through its multiple sensors. The multiple sensors of the atmospheric environment monitoring subsystem include a SO2 sensor 8, a H2S sensor 9, a Cl2 sensor 10, a NO2 sensor 11, a CO2 sensor 12, an O3 sensor 13, a temperature sensor 14 and a humidity sensor 15; specifically, the SO2 sensor 8 is used to measure the corrosive gas SO2 in the atmospheric environment of the working area of ​​the anchor rod and cable; the H2S sensor 9 is used to measure the corrosive gas H2S in the atmospheric environment of the working area of ​​the anchor rod and cable; the Cl2 sensor 10 is used to measure the corrosive gas Cl2 in the atmospheric environment of the working area of ​​the anchor rod and cable; the NO2 sensor 11 is used to measure the corrosive gas NO2 in the atmospheric environment of the working area of ​​the anchor rod and cable; the CO2 sensor 12 is used to measure the corrosive gas CO2 in the atmospheric environment of the working area of ​​the anchor rod and cable; the O3 sensor 13 is used to measure the corrosive gas O3 in the atmospheric environment of the working area of ​​the anchor rod and cable; the temperature sensor 14 is used to measure the temperature in the atmospheric environment of the working area of ​​the anchor rod and cable, and the humidity sensor 15 is used to measure the humidity in the atmospheric environment of the working area of ​​the anchor rod and cable.

[0028] Preferably, in combination with the above scheme, Figure 1 and Figure 2As shown, the stress corrosion monitoring system can be set in the stress corrosion monitoring department 2. The atmospheric environment monitoring subsystem is connected to the No. 1 underground intrinsically safe switch 4 through optical fiber, the No. 1 underground intrinsically safe switch 4 is connected to the ground switch 3 through optical fiber, and the ground switch 3 is connected to the stress corrosion monitoring system through optical fiber 27. Specifically, the SO2 sensor 8, H2S sensor 9, Cl2 sensor 10, NO2 sensor 11, CO2 sensor 12, O3 sensor 13, temperature sensor 14 and humidity sensor 15 are respectively connected to the atmospheric environment monitoring subsystem through optical fiber to realize communication data transmission. Further, the data detected by the SO2 sensor 8, H2S sensor 9, Cl2 sensor 10, NO2 sensor 11, CO2 sensor 12, O3 sensor 13, temperature sensor 14 and humidity sensor 15 are transmitted to the atmospheric environment monitoring subsystem through optical fiber. Furthermore, the atmospheric environment monitoring subsystem filters, denoises and normalizes the collected data and transmits it to the No. 1 underground intrinsically safe switch 4 via optical fiber 27. The No. 1 underground intrinsically safe switch 4 stores a copy of the preprocessed data and transmits it to the ground switch 3 via optical fiber.

[0029] Preferably, in combination with the above scheme, Figure 1 and Figure 2 As shown, the underground water environment monitoring subsystem can be set in the water environment monitoring substation 16. The underground water environment monitoring subsystem monitors the corrosion factors in the working environment water of the coal mine underground anchor bolts and cables through its multiple sensors; the multiple sensors of the underground water environment monitoring subsystem include Cl - Sensor 18, SO4 2- sensor 19, DO sensor 20 and PH sensor 17; specifically, Cl - Sensor 18 is used to measure the Cl of the water environment in the anchor bolt working area - Concentration; SO4 2- Sensor 19 is used to measure the SO4 in the water environment of the anchor bolt working area 2- DO sensor 20 is used to measure the dissolved oxygen concentration of the water environment in the anchor working area; PH sensor 17 is used to measure the pH of the water environment in the anchor working area.

[0030] Preferably, in combination with the above scheme, Figure 1 and Figure 2 As shown, the underground water environment monitoring subsystem is connected to the No. 2 underground intrinsically safe switch 5 through optical fiber, the No. 2 underground intrinsically safe switch 5 is connected to the surface switch 3 through optical fiber 27, and the surface switch 3 is connected to the stress corrosion monitoring system through optical fiber. - Sensor 18, SO4 2-Sensor 19, DO sensor 20 and PH sensor 17 are respectively connected to the downhole water environment monitoring subsystem through optical fibers; further, Cl - Sensor 18, SO4 2- The data detected by sensor 19, DO sensor 20 and PH sensor 17 are transmitted to the underground water environment monitoring subsystem via optical fiber; the underground water environment monitoring subsystem filters, denoises and normalizes the collected data and transmits it to the No. 2 underground intrinsically safe switch 5 via optical fiber, and the No. 2 underground intrinsically safe switch 5 stores a copy of the pre-processed data and transmits it to the ground switch 3 via optical fiber 27.

[0031] Preferably, in combination with the above scheme, Figure 1 and Figure 2 As shown, the stress monitoring subsystem is set in the stress monitoring substation 21. The stress monitoring subsystem monitors the stress and strain changes in the working state of the anchor rods and cables in the coal mine and the stress and displacement of the surrounding rock in the anchor rod and cable support area through its multiple sensors. The multiple sensors of the stress monitoring subsystem include a stress sensor 22, a strain sensor 23, a rock stress sensor 24 and a multi-point rock displacement meter 25; wherein the stress sensor 22 can be an anchor stress sensor or an anchor cable stress sensor 22; the strain sensor 23 can be an anchor strain sensor or an anchor cable strain sensor; specifically, the anchor stress sensor is used to monitor the stress changes of the anchor rod, the anchor cable stress sensor is used to monitor the stress changes of the anchor cable, the anchor strain sensor is used to monitor the strain changes of the anchor rod, the anchor cable strain sensor is used to monitor the strain changes of the anchor cable, the rock stress sensor 24 is used to monitor the stress changes of the rock in the working area of ​​the anchor rod and cable, and the multi-point rock displacement meter 25 is used to monitor the displacement changes of the rock in the area.

[0032] Preferably, in combination with the above scheme, Figure 1 and Figure 2As shown, the stress monitoring subsystem is connected to the No. 3 underground intrinsically safe switch 6 through the optical fiber 27, the No. 3 underground intrinsically safe switch 6 is connected to the ground switch 3 through the optical fiber 27, and the ground switch 3 is connected to the stress corrosion monitoring system through the optical fiber 27. Specifically, the anchor stress sensor, the anchor cable stress sensor, the anchor strain sensor, the anchor cable strain sensor, the rock stress sensor 24 and the multi-point rock displacement meter 25 are respectively connected to the underground water environment monitoring subsystem through the optical fiber 27; the data of the anchor stress sensor, the anchor cable stress sensor, the anchor strain sensor, the anchor cable strain sensor, the rock stress sensor 24 and the multi-point rock displacement meter 25 are transmitted to the stress monitoring subsystem through the optical fiber 27; the stress monitoring subsystem filters, denoises and normalizes the collected data and transmits it to the No. 3 underground intrinsically safe switch 6 through the optical fiber 27, and the No. 3 underground intrinsically safe switch 6 stores a copy of the pre-processed data and transmits it to the ground switch 3 through the optical fiber 27.

[0033] Preferably, in combination with the above scheme, Figure 1 and Figure 2 As shown, the coal mine underground anchor bolt and cable stress corrosion monitoring system provided by the present invention also includes a ground data analysis and decision-making subsystem, which is arranged in the coal mine safety dispatching command center 1; the ground data analysis and decision-making subsystem is connected to the stress corrosion monitoring system through optical fiber; the ground data analysis and decision-making subsystem is used to analyze and process the data measured underground and transmitted to the ground switch 3, and compare the measured corrosion factor data and stress data with the threshold value of each factor under the condition of stress corrosion failure, evaluate the rate and damage possibility of stress corrosion of anchor bolts and cables, and evaluate the stress corrosion rate that is too fast or the stress corrosion damage is possible. Corresponding anti-corrosion measures are taken for anchor rods and cables with high energy resistance to avoid damage to the anchor rods and cables, ensure the strength of the anchor rods and cables, and extend the service life of the anchor rods and cables; the ground switch 3 is used to collect and summarize the data of the No. 1 underground intrinsically safe switch 4, the No. 2 underground intrinsically safe switch 5, and the No. 3 underground intrinsically safe switch 6, and transmit it to the stress corrosion monitoring department 2, the stress corrosion monitoring department 2 processes and analyzes the data, compares and obtains the evaluation results, and transmits them to the coal mine safety dispatching and command center 1, which makes decisions and takes corresponding measures, such as arranging relevant personnel to take corresponding anti-corrosion measures in areas where the stress corrosion rate of anchor rods and cables is too fast.

[0034] Preferably, in combination with the above scheme, Figure 1 and Figure 2As shown, in the scheme of the present application, the atmospheric environment monitoring subsystem is electrically connected to the stress corrosion monitoring system through a cable 26 to realize power supply; each sensor of the atmospheric environment monitoring subsystem is electrically connected to the atmospheric environment monitoring subsystem through a cable 26 to realize power supply. The underground water environment monitoring subsystem is electrically connected to the stress corrosion monitoring system through a cable 26 to realize power supply; each sensor of the underground water environment monitoring subsystem is electrically connected to the underground water environment monitoring subsystem through a cable 26 to realize power supply. The stress monitoring subsystem is electrically connected to the stress corrosion monitoring system through a cable 26 to realize power supply, and each sensor of the stress monitoring subsystem is electrically connected to the stress monitoring subsystem through a cable 26 to realize power supply; in the above scheme, electrical safety can be effectively guaranteed by cable connection. The underground coal mine anchor bolt and cable stress corrosion monitoring system provided by the present application, the underground sensors can be increased or decreased according to the actual needs of the mine, and each sensor can be detachably set in the coal mine, so as to adjust the installation spacing, and can be changed accordingly according to the actual situation of the mine.

[0035] Denoising in this application is the process of removing or reducing noise from data. In anchor stress corrosion monitoring, the data collected by the sensor may be affected by various noises, which may come from the electronic noise of the sensor itself, environmental interference, errors in the signal transmission process, etc. The purpose of denoising is to improve the quality of the data and make the analysis results more accurate and reliable. Its specific functions include: (1) Identify and remove random errors: Noise usually appears as random errors that show irregular patterns in the data. The denoising process attempts to identify these random errors and remove them from the data.

[0036] (2) Smoothing data: By smoothing the data, short-term fluctuations can be reduced, making the data closer to the actual trend of change.

[0037] (3) Retain useful signals: The goal of denoising is to remove noise while retaining useful signals, such as the actual changes in anchor stress.

[0038] (4) Improve signal-to-noise ratio: Denoising can improve the signal-to-noise ratio of the data, that is, the ratio of useful signal to noise, making the signal clearer.

[0039] Furthermore, the normalization of this application is a data processing method, the purpose of which is to adjust the data scale so that it falls within a specific range, usually [0,1] or [-1,1]. The purpose of normalization is to eliminate the dimensional influence between different data features monitored by each sensor, so that each feature has the same importance in the data analysis process, or to meet the requirements of certain algorithms for the data range; specifically, it is manifested as: (1) Dimensionless: Through normalization, data with different dimensions can be converted into dimensionless pure values, which is convenient for comparison and calculation.

[0040] (2) Unified scale: Normalization ensures that every feature in the dataset has the same scale, which is especially important for distance-based calculations, such as in the K-nearest neighbor (KNN) algorithm and the K-means clustering algorithm.

[0041] (3) Accelerated convergence: In machine learning algorithms, normalization can accelerate the convergence of the model because the gradient descent algorithm is more effective when all features have similar scales.

[0042] (4) Avoid numerical problems: In some algorithms, such as neural networks, if the range of input data varies greatly, it may cause numerical stability problems. Normalization helps to avoid these problems.

[0043] Preferably, in combination with the above scheme, Figure 1 and Figure 2 As shown, each underground component of the coal mine underground anchor bolt and cable stress corrosion monitoring system provided by the present invention adopts intrinsically safe components to avoid the generation of electric sparks that may contact the flammable and explosive gases underground and cause explosion hazards. Intrinsically safe components refer to electrical equipment that will not generate enough energy to ignite combustible materials in a specific environment during design and manufacture even in the event of a failure. Intrinsic safety is an important technical means to prevent fires and explosions caused by electrical equipment failures in industrial processes, especially in environments with flammable and explosive gases and dust. Coal mines underground stipulate that each electronic component must use intrinsically safe components.

[0044] Specifically, in combination with the above scheme, Figure 2 and Figure 3 As shown, the monitoring process of the stress corrosion monitoring system for anchor rods and cables in coal mines provided by the present invention is as follows: S1: consists of various sensors SO2 sensor 8, H2S sensor 9, Cl2 sensor 10, NO2 sensor 11, CO2 sensor 12, O3 sensor 13, temperature sensor 14, humidity sensor 15, PH sensor 17, Cl - Sensor 18, SO4 2- The sensor 19, the DO sensor 20, the stress sensor 22 (including the anchor stress sensor and the anchor cable stress sensor), the strain sensor 23 (including the anchor strain sensor and the anchor cable strain sensor), the rock stress sensor 24, and the multi-point rock displacement meter 25 measure the corresponding corrosion factor and stress data, and transmit them to the underground atmospheric environment monitoring subsystem of the corresponding atmospheric environment monitoring substation 7, the underground water environment monitoring subsystem of the water environment monitoring substation 16, and the stress monitoring subsystem of the stress monitoring substation 21; S2: The underground atmospheric environment monitoring subsystem, the underground water environment monitoring subsystem, and the stress monitoring subsystem perform pre-processing such as filtering, denoising, and normalization on the data, and transmit the pre-processed data to the corresponding No. 1 underground intrinsically safe switch 4, No. 2 underground intrinsically safe switch 5, and No. 3 underground intrinsically safe switch 6; S3: The No. 1 underground intrinsically safe switch 4, the No. 2 underground intrinsically safe switch 5 and the No. 3 underground intrinsically safe switch 6 store a copy of the collected data and then transmit it to the surface switch 3; S4: The surface switch 3 collects and summarizes the data of the No. 1 underground intrinsically safe switch 4, the No. 2 underground intrinsically safe switch 5, and the No. 3 underground intrinsically safe switch 6, and transmits it to the stress corrosion monitoring system of the stress corrosion monitoring department 2; S5: The stress corrosion monitoring system of the stress corrosion monitoring department 2 processes and analyzes the data, compares and obtains the evaluation results, and transmits them to the coal mine safety dispatching command center 1; S6: The coal mine safety dispatching command center 1 makes decisions and takes corresponding measures, such as arranging relevant personnel to take corresponding anti-corrosion measures in areas where the stress corrosion rate of anchor rods and cables is too fast.

[0045] The coal mine underground anchor bolt and cable stress corrosion monitoring system provided by the present invention has the following beneficial effects: The solution provided by the present invention cleverly utilizes the anchor rod and anchor cable stress corrosion monitoring system to monitor the stress corrosion of anchor rods and anchor cables, filling the gap in stress corrosion monitoring of anchor rods and anchor cables in coal mines, and can accurately and efficiently monitor the stress and various corrosion factors in the working environment of anchor rods and anchor cables, avoid the failure of anchor rod and anchor cable support, protect the lives of workers, and ensure safe production in mines.

[0046] The present invention has high reliability and working continuity by designing the underground atmospheric environment monitoring subsystem, the underground water environment monitoring subsystem, the stress monitoring subsystem and the ground data analysis and decision-making subsystem to work in series and parallel, greatly simplifying the process and reducing component redundancy; multiple sensors are used to monitor various corrosion factors and stresses in the working environment of anchor rods and cables, fully considering various stress corrosion influencing factors in the service environment of anchor rods and cables in coal mines, and sensors can be flexibly added or removed.

[0047] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the above-mentioned technical content without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the present invention without departing from the content of the technical solution of the present invention belong to the protection scope of the present technical solution.

Claims

1. A stress corrosion monitoring system for anchor bolts and cables in coal mines, characterized in that: The monitoring system includes a stress corrosion monitoring system, an underground atmospheric environment monitoring subsystem, an underground water environment monitoring subsystem and a stress monitoring subsystem; The atmospheric environment monitoring subsystem is connected to the stress corrosion monitoring system; the atmospheric environment monitoring subsystem is used to monitor the atmospheric corrosion factors in the working environment of the anchor bolts and cables in the coal mine; The underground water environment monitoring subsystem is connected to the stress corrosion monitoring system; the underground water environment monitoring subsystem is used to monitor the corrosion factors in the working environment water of the anchor rods and cables in the coal mine; The stress monitoring subsystem is connected to the stress corrosion monitoring system; the stress monitoring subsystem is used to monitor the stress and strain changes in the working state of the anchor rods and cables in the coal mine, as well as the stress and displacement of the surrounding rock in the anchor rod and cable support area.

2. The coal mine underground anchor bolt and cable stress corrosion monitoring system according to claim 1 is characterized in that: The atmospheric environment monitoring subsystem monitors the atmospheric corrosion factors in the working environment of anchor rods and cables in coal mines through its multiple sensors; the multiple sensors include SO2 sensors, H2S sensors, Cl2 sensors, NO2 sensors, CO2 sensors, O3 sensors, temperature sensors and humidity sensors; the SO2 sensor is used to measure the corrosive gas SO2 in the atmospheric environment of the working area of ​​anchor rods and cables; the H2S sensor is used to measure the corrosive gas H2S in the atmospheric environment of the working area of ​​anchor rods and cables; the Cl2 sensor is used to measure the corrosive gas Cl2 in the atmospheric environment of the working area of ​​anchor rods and cables; the NO2 sensor is used to measure the corrosive gas NO2 in the atmospheric environment of the working area of ​​anchor rods and cables; the CO2 sensor is used to measure the corrosive gas CO2 in the atmospheric environment of the working area of ​​anchor rods and cables; the O3 sensor is used to measure the corrosive gas O3 in the atmospheric environment of the working area of ​​anchor rods and cables; the temperature sensor is used to measure the temperature in the atmospheric environment of the working area of ​​anchor rods and cables, and the humidity sensor is used to measure the humidity in the atmospheric environment of the working area of ​​anchor rods and cables.

3. The coal mine underground anchor bolt and cable stress corrosion monitoring system according to claim 2 is characterized in that: The atmospheric environment monitoring subsystem is communicatively connected with No. 1 underground intrinsically safe switch via optical fiber, the No. 1 underground intrinsically safe switch is communicatively connected with the ground switch via optical fiber, and the ground switch is communicatively connected with the stress corrosion monitoring system via optical fiber; the SO2 sensor, the H2S sensor, the Cl2 sensor, the NO2 sensor, the CO2 sensor, the O3 sensor, the temperature sensor and the humidity sensor are communicatively connected with the atmospheric environment monitoring subsystem via optical fiber respectively; the data detected by the SO2 sensor, the H2S sensor, the Cl2 sensor, the NO2 sensor, the CO2 sensor, the O3 sensor, the temperature sensor and the humidity sensor are transmitted to the atmospheric environment monitoring subsystem via optical fiber; the atmospheric environment monitoring subsystem filters, denoises and normalizes the collected data and transmits it to the No. 1 underground intrinsically safe switch via optical fiber, and the No. 1 underground intrinsically safe switch stores a copy of the pre-processed data and transmits it to the ground switch via optical fiber.

4. The coal mine underground anchor bolt and cable stress corrosion monitoring system according to claim 1, characterized in that: The underground water environment monitoring subsystem monitors the corrosion factors in the working environment water of the coal mine underground anchor bolts and cables through its multiple sensors; the multiple sensors include Cl - Sensor, SO4 2- sensor, DO sensor and PH sensor; the Cl - The sensor is used to measure the Cl in the water environment in the anchor cable working area. - Concentration; the SO4 2- The sensor is used to measure the SO4 in the water environment of the anchor working area. 2- concentration; the DO sensor is used to measure the dissolved oxygen concentration of the water environment in the working area of ​​the anchor rod and cable; the PH sensor is used to measure the pH of the water environment in the working area of ​​the anchor rod and cable.

5. The coal mine underground anchor bolt and cable stress corrosion monitoring system according to claim 4, characterized in that: The underground water environment monitoring subsystem is connected to the No. 2 underground intrinsically safe switch through optical fiber, the No. 2 underground intrinsically safe switch is connected to the ground switch through optical fiber, and the ground switch is connected to the stress corrosion monitoring system through optical fiber; - Sensor, the SO4 2- The sensor, the DO sensor and the PH sensor are respectively connected to the downhole water environment monitoring subsystem through optical fibers; the Cl - Sensor, the SO4 2- The data detected by the sensor, the DO sensor and the PH sensor are transmitted to the downhole water environment monitoring subsystem via optical fiber; the downhole water environment monitoring subsystem filters, denoises and normalizes the collected data and transmits it to the No. 2 downhole intrinsically safe switch via optical fiber, and the No. 2 downhole intrinsically safe switch stores a copy of the preprocessed data and transmits it to the ground switch via optical fiber.

6. The coal mine underground anchor bolt and cable stress corrosion monitoring system according to claim 1, characterized in that: The stress monitoring subsystem monitors the stress and strain changes in the working state of anchor rods and cables in coal mines and the stress and displacement of surrounding rocks in the anchor rod and cable support area through its multiple sensors; the multiple sensors include anchor rod stress sensors, anchor cable stress sensors, anchor rod strain sensors, anchor cable strain sensors, rock stress sensors and multi-point rock displacement meters; the anchor rod stress sensor is used to monitor the stress changes of anchor rods, the anchor cable stress sensor is used to monitor the stress changes of anchor cables, the anchor rod strain sensor is used to monitor the strain changes of anchor rods, the anchor cable strain sensor is used to monitor the strain changes of anchor cables, the rock stress sensor is used to monitor the stress changes of rock in the working area of ​​anchor rods and cables, and the multi-point rock displacement meter is used to monitor the displacement changes of rock in the area.

7. The coal mine underground anchor bolt and cable stress corrosion monitoring system according to claim 6, characterized in that: The stress monitoring subsystem is communicatively connected with the No. 3 underground intrinsically safe switch via optical fiber, the No. 3 underground intrinsically safe switch is communicatively connected with the ground switch via optical fiber, and the ground switch is communicatively connected with the stress corrosion monitoring system via optical fiber; the anchor stress sensor, the anchor cable stress sensor, the anchor strain sensor, the anchor cable strain sensor, the rock stress sensor and the multi-point rock displacement meter are communicatively connected with the underground water environment monitoring subsystem via optical fiber respectively; the data of the anchor stress sensor, the anchor cable stress sensor, the anchor strain sensor, the anchor cable strain sensor, the rock stress sensor and the multi-point rock displacement meter are transmitted to the stress monitoring subsystem via optical fiber; the stress monitoring subsystem filters, denoises and normalizes the collected data and transmits it to the No. 3 underground intrinsically safe switch via optical fiber, and the No. 3 underground intrinsically safe switch stores a copy of the pre-processed data and transmits it to the ground switch via optical fiber.

8. The coal mine underground anchor bolt and cable stress corrosion monitoring system according to claim 1, characterized in that: The monitoring system also includes a ground data analysis and decision-making subsystem, which is communicatively connected to the stress corrosion monitoring system via optical fiber; the ground data analysis and decision-making subsystem is used to analyze and process the data measured underground and transmitted to the ground switch, and compare the measured corrosion factor data and stress data with the threshold values ​​of each factor under stress corrosion failure conditions.

9. The coal mine underground anchor bolt and cable stress corrosion monitoring system according to claim 1, characterized in that: The atmospheric environment monitoring subsystem is electrically connected to the stress corrosion monitoring system through cables, and each sensor of the atmospheric environment monitoring subsystem is electrically connected to the atmospheric environment monitoring subsystem through cables; the underground water environment monitoring subsystem is electrically connected to the stress corrosion monitoring system through cables, and each sensor of the underground water environment monitoring subsystem is electrically connected to the underground water environment monitoring subsystem through cables; the stress monitoring subsystem is electrically connected to the stress corrosion monitoring system through cables, and each sensor of the stress monitoring subsystem is electrically connected to the stress monitoring subsystem through cables; each of the sensors can be detachably arranged underground in a coal mine, so as to adjust the installation spacing.

10. The coal mine underground anchor bolt and cable stress corrosion monitoring system according to claim 1, characterized in that: Each downhole component of the monitoring system adopts an intrinsically safe component.

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