Coal mine chemical grouting real-time multi-parameter component monitoring system and coal mine chemical grouting evaluation method
By using a real-time multi-parameter component monitoring system in coal mine production, the flow rate, pressure, and temperature during the grouting process can be monitored and adjusted in real time. This solves the safety hazards and the generation of toxic and harmful gases caused by improper parameter control during chemical grouting, thereby improving the grouting effect and production safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CCTEG COAL MINING RES INST
- Filing Date
- 2026-03-27
- Publication Date
- 2026-05-01
AI Technical Summary
In the coal mine production process, improper parameter control during chemical grouting can easily lead to excessively high temperatures, causing safety hazards and the generation of toxic and harmful gases, thus affecting production safety.
Design a real-time multi-parameter component monitoring system for chemical grouting in coal mines, including a grouting device and a monitoring instrument. The system monitors the flow rate, pressure, and temperature parameters during the grouting process in real time through flow meters, pressure transmitters, and temperature sensors. The system is combined with the grouting monitoring instrument for real-time adjustment and display, and forms a database for evaluation.
It enables real-time monitoring and adjustment of the chemical grouting process, preventing safety issues and the generation of toxic and harmful gases caused by inappropriate parameter control, thereby improving grouting effect and production safety.
Smart Images
Figure CN121954129A_ABST
Abstract
Description
A real-time multi-parameter component monitoring system for chemical grouting in coal mines and an evaluation method for chemical grouting in coal mines. Technical Field
[0001] This application relates to the field of coal mine safety production technology, and in particular to a real-time multi-parameter component monitoring system for chemical grouting in coal mines and a method for evaluating chemical grouting in coal mines. Background Technology
[0002] Coal mine production includes two main stages: tunnel excavation and face mining. Geological factors such as faults, geological structures, folds, collapse columns, and groundwater have a significant impact on both tunnel excavation and face mining. During tunnel excavation, roof falls and gas accumulation are common, potentially leading to gas explosions. Prolonged water seepage from the tunnel roof can negatively affect tunnel support, causing mudification of the surrounding rock and, over time, anchor bolt failure and rock deformation. During face mining, high mining stress, varying geological structures, and groundwater can cause roof falls, support instability, and even guide frame collapse. Large volumes of water can also flood the mine, severely impacting production safety.
[0003] To address the problems that the above hydrogeological conditions can cause during tunnel excavation and face mining, grouting is often used on-site. To ensure timely on-site construction, chemical grouting is frequently employed to handle problems arising during tunnel excavation and face mining. This primarily involves grouting reinforcement, filling, water plugging, and the treatment of toxic and harmful gases and dust. Commonly used chemical materials include two-component materials such as polyurethane, modified polyurethane, urea-formaldehyde resin, epoxy resin, and acrylates. Given the high fracture rate, porosity, and short spontaneous combustion period of the coal seam, the large amount of heat released during grouting can easily affect the coal seam, potentially triggering toxic and harmful gases, spontaneous combustion of the coal seam, and other issues, seriously impacting on-site safety and personnel. Summary of the Invention
[0004] The purpose of this application is to provide a real-time multi-parameter component monitoring system for chemical grouting in coal mines and an evaluation method for chemical grouting in coal mines. This system can monitor key parameters during the chemical grouting process, prevent excessively high temperatures from affecting the grouting results, and ensure the grouting effect.
[0005] To achieve the above objectives, this application provides the following solution: Firstly, this application provides a real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines, comprising: a grouting device and a grouting monitoring instrument; the grouting device includes a grouting pump, two material tanks, a flow meter, a pressure regulating valve, multiple pressure transmitters, a check valve, and multiple temperature sensors; the two material tanks contain slurries of different chemical grouting materials, and the slurries in the two material tanks are mixed by the grouting pump and then injected into the grouting hole; each material tank is equipped with the flow meter, regulating valve, pressure transmitter, and check valve on the connecting pipeline between it and the grouting pump; and various grouting devices are installed at different depths of the grouting hole. A temperature sensor is included; a pressure transmitter is installed on the connecting pipeline between the grouting pump and the grouting hole; a flow meter is used to adjust the flow rate of grout from different chemical grouting materials into the grouting pump; the pressure transmitter is used to collect the grouting pressure of grout from different chemical grouting materials and the grouting pressure of mixed grout; the temperature sensor is used to collect the grout reaction temperature at different depths of the grouting hole at different grouting stages; a grouting monitoring instrument is electrically connected to the flow meter, the pressure transmitter, and the temperature sensor respectively, and is used to monitor, adjust, and display the grouting parameters in real time during the grouting process; the grouting parameters include flow rate, grouting pressure, and reaction temperature.
[0006] Secondly, this application provides a method for evaluating chemical grouting in coal mines. The method is applied to the aforementioned real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines. The method includes: acquiring grouting parameters during the grouting process; the grouting parameters include flow rate, grouting pressure, and reaction temperature; calculating the qualification index of each grouting parameter; calculating a comprehensive qualification index based on the qualification index of each grouting parameter; and evaluating the grouting process based on the comprehensive qualification index.
[0007] According to the specific embodiments provided in this application, this application has the following technical effects: This application can monitor and analyze the parameters such as flow rate, pressure, and temperature in real time during the chemical material grouting process, thereby adjusting the parameters in a timely manner during the grouting process, preventing on-site safety problems caused by inappropriate control of grouting parameters, preventing incomplete reaction of grout from affecting the coal and rock mass, and preventing the generation of toxic and harmful gases from affecting production. Attached Figure Description
[0008] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0009] Figure 1 is a diagram of the grouting hole layout; Figure 2 is a schematic diagram of the structural modules of a real-time multi-parameter component monitoring system for chemical grouting in coal mines provided in an embodiment of this application; Figure 3 is a schematic diagram of the main unit appearance of the grouting monitor; Figure 4 is a schematic diagram of the power supply appearance of the grouting monitor; Figure 5 is a schematic diagram of the temperature sensor arrangement. Detailed Implementation
[0010] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0011] This application, in conjunction with the purpose of chemical grouting, monitors the damage characteristics of coal and rock masses through preliminary surveys, then determines the chemical grouting design. During single-hole grouting, a grouting device is connected. Throughout the grouting device, monitoring instruments are connected at different locations according to different chemical material components and different grouting materials to monitor and display multiple parameters such as grouting pressure, flow rate, and temperature in real time. A real-time grouting monitoring recorder is used to set the data recording time interval to monitor and record real-time grouting parameters during the grouting process, forming a database for subsequent evaluation of the grouting effect.
[0012] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0013] In an exemplary embodiment, referring to Figure 1, the real-time multi-parameter component monitoring system for chemical grouting in coal mines provided in this application is applied to a coal mine roadway surrounding rock reinforcement project. First, a grouting hole layout scheme is designed (72 grouting holes in rows 1 to 9 as shown in Figure 1). During construction of each grouting hole, a grouting device is connected.
[0014] As shown in Figure 2, the present application provides a real-time multi-parameter component monitoring system for chemical grouting in coal mines, which includes a grouting device and a grouting monitoring instrument.
[0015] The grouting device includes a grouting pump ZP, two material tanks, a flow meter FE, a pressure regulating valve FV, multiple pressure transmitters, a check valve, and multiple temperature sensors TS.
[0016] Two material tanks contain chemical materials of different components (liquid A and liquid B). The slurry from the two material tanks is mixed by a grouting pump and then injected into the grouting hole. Each material tank is equipped with a flow meter, regulating valve, pressure transmitter, and check valve on the connecting pipeline between it and the grouting pump. Temperature sensors are installed at different depths of the grouting hole. A pressure transmitter is installed on the connecting pipeline between the grouting pump and the grouting hole.
[0017] The flow meter is used to regulate the flow rate of grout from different chemical grouting materials into the grouting pump.
[0018] The pressure transmitter is used to collect the grouting pressure of grouts made of different chemical grouting materials and the grouting pressure of mixed grouts.
[0019] The temperature sensors are used to collect the grout reaction temperature at different depths of the grouting holes during different grouting stages. Excessively high grout reaction temperatures can negatively impact the grouting process, particularly affecting the coal and rock mass and potentially leading to safety accidents. The arrangement of the temperature sensors is shown in Figure 5.
[0020] The grouting monitoring instrument is electrically connected to the flow meter, the pressure transmitter and the temperature sensor respectively, and is used to monitor, adjust and display the grouting parameters in real time during the grouting process; the grouting parameters include flow rate, grouting pressure and reaction temperature.
[0021] Depending on the type of material, the on-site chemical process for coal and rock masses generally involves a mixture of slurry A and slurry B. Other forms also exist, mainly ① one type of slurry; ② two types of slurry A + B; ③ two types of slurry + catalyst, i.e., slurry A + slurry B + catalyst. The above descriptions are only general examples. Before grouting, a site investigation is conducted to design the grouting process, determine the type of grouting material and grouting pump, and monitor relevant slurry parameters according to the different types.
[0022] In an optional embodiment, the system further includes a viscosity meter installed on the connecting pipeline between each material tank and the grouting pump. The viscosity meter is used to collect the viscosity of grouts from different chemical grouting materials. Taking a grouting process using liquid A + liquid B as an example, the viscosity of the grouts generally varies significantly, resulting in different grout flow rates during grouting. The grout reaction typically requires a 1:1 ratio. The viscosity of the grout affects the amount of liquid A and liquid B used after a period of grouting, thus impacting the grouting effect.
[0023] In an optional embodiment, the system further includes an optical fiber sensor (such as an SPR surface plasmon resonance sensor) disposed on the connecting pipeline between each material tank and the grouting pump, the optical fiber sensor being used to collect the refractive index of the grout of different chemical grouting materials.
[0024] In an optional embodiment, the system further includes: a toxic and harmful gas sensor, installed at the grouting pump and the grouting hole, for collecting the concentration of toxic and harmful gases generated when grouts of different chemical grouting materials are mixed and the concentration of toxic and harmful gases overflowing from the coal and rock mass during the grouting process of the mixed grout.
[0025] In an optional embodiment, the system further includes: a pH sensor, disposed on the connecting pipeline between each material tank and the grouting pump and on the grouting pump, for collecting the pH value of the slurry of different chemical grouting materials and the pH value of the mixed slurry.
[0026] Furthermore, the grouting monitoring instrument includes a main unit and a power supply, the power supply being used to power the main unit. The main unit and the power supply are connected via a power interface 6 on the main unit. As shown in Figure 3, the main unit includes an explosion-proof housing 9, a data processor (not shown in the figure) disposed within the explosion-proof housing, and a display screen 12 disposed on the explosion-proof housing 9. The explosion-proof housing 9 is equipped with a mouse touch controller 8 and a display screen window 10. The explosion-proof housing 9 meets the explosion-proof requirements for underground coal mine environments, and the display screen window is equipped with a display screen window opening switch 11 for opening and closing the display screen 12.
[0027] The grouting monitoring instrument is equipped with a USB interface 7, which is used to import the design of specific grouting projects. During construction, the grouting design section, parameters and operating procedures are displayed to prevent improper parameter settings from affecting the construction quality during on-site construction.
[0028] The data processor is electrically connected to the flow meter, the pressure transmitter, and the temperature sensor via data interfaces (flow interface 1-2, pressure interface 3-4, and temperature interface 5) respectively, and is used to monitor and adjust the grouting parameters in real time during the grouting process.
[0029] By setting the data recording time interval through a data processor, real-time grouting parameters during the grouting process are monitored and recorded, and parameters are adjusted in a timely manner to prevent on-site safety issues caused by inappropriate control of grouting parameters; and a database is formed for later evaluation of the grouting effect.
[0030] The display screen 12 is used to display grouting parameters during the grouting process.
[0031] Furthermore, as shown in Figure 4, the power supply is also equipped with a battery explosion-proof housing 13, a battery switch 14, and a battery interface 15.
[0032] In this embodiment, the grouting monitoring instrument adopts a combined automatic real-time monitoring system of "ARM + touch screen + microcontroller", which takes into account real-time data acquisition, data processing and intuitive human-computer interaction. It realizes a closed loop of "acquisition-processing-interaction" through hardware division of labor. Each component has a clear function and works together. The microcontroller is responsible for real-time data acquisition and low-level control: it connects to the sensor to collect raw data at high frequency; and it transmits data to the ARM in real time through the communication interface.
[0033] Data Acquisition and Display: (1) Based on the site conditions, data acquisition adopts multi-module collaborative monitoring and control. The data acquisition frequency is designed to be self-adjustable, and the frequency range is 1s-5min based on the site conditions. (2) Through parameter setting and function design of the grouting monitoring instrument, the function of real-time display of multiple parameters on the same screen is realized. The maximum grouting pressure is monitored at no less than 30MPa. The maximum value of the data is displayed. When the grouting parameters exceed the preset range, the alarm module is used to provide an alarm prompt. Based on the site construction conditions, the construction process and parameters are adjusted in a timely manner according to the real-time curve and related data. (3) Based on the site requirements, the historical curve is displayed by adjusting the parameter curves, coordinate ranges, time, units, etc. of different areas, and the maximum value of the data is displayed. (4) A prompt function is set at the end of grouting to prevent accidental touch. When saving the data file, the file name is edited and saved to realize the export of real-time curves and printing through a printer.
[0034] Furthermore, the grouting monitoring instrument also includes a 3D display module for grouting holes, used to provide a 3D view of the grouting holes and the grouting process. On-site, based on the construction situation, any issues encountered during grouting can be promptly addressed by referring to the grouting design and adjusting the grouting parameters in conjunction with monitoring.
[0035] Furthermore, the grouting monitoring instrument also includes a grouting design module, used to design grouting based on the grout of different chemical grouting materials, grouting pumps, grouting hole parameters, and grouting sequence; the grouting hole parameters include spacing, row spacing, and hole depth.
[0036] Furthermore, the real-time multi-parameter component monitoring system for chemical grouting in coal mines provided in this embodiment also includes a communication module and an AI module. The communication module is used to upload grouting parameters to the AI module, and the AI module, in conjunction with an engineering database, evaluates the grouting construction quality and provides guidance.
[0037] The system establishes an AI module, forming a multi-dimensional sensor unit integrated structure. Combined with the DEEPSEEK engineering database, it simultaneously monitors and stores multiple data points achieved through miniaturized process technology during each construction process. It performs statistical analysis on the grouting pressure, flow rate, site temperature, and material reaction temperature of different organic materials under different geological conditions (gas, water), different temperatures, and different humidity conditions during specific engineering construction. It provides quality assessments for construction, forms a large database, and provides guidance for chemical material grouting construction under relevant geological conditions.
[0038] The grouting parameters are encrypted during transmission. To improve transmission reliability, a retransmission mechanism and data verification method are designed. A checksum is added during data transmission to ensure correct data transmission. When an error occurs during data transmission, a retransmission request is automatically triggered until the data is correctly received, ensuring data integrity.
[0039] This application addresses existing problems in the coal and rock mass at the site. It identifies the grouting objectives, including reinforcement, filling, water plugging, fire prevention and extinguishing, and treatment of toxic and harmful gases, and determines the corresponding grouting scheme and supporting equipment. The grouting process connects the grouting material and the grouting pump. Flow meters and pressure transmitters are installed on pipelines for different grouting material components. Temperature sensors are installed at the grouting orifice or inside the hole. Flow meters on the branch pipelines are used to statistically analyze the real-time flow and usage of different grouting components. Pressure transmitters are used to monitor the real-time grouting pressure of different chemical components and adjust the grouting process accordingly. Temperature sensors are used to monitor the mixing temperature of different components during grouting to prevent excessive temperature from affecting the grouting results. Through real-time monitoring of multiple parameters during the chemical grouting process, parameters are adjusted promptly to prevent on-site safety issues caused by inappropriate grouting parameter control, ensuring the effectiveness of grouting monitoring and further improving the management level of the roadway surrounding rock and roof.
[0040] In an exemplary embodiment, this application provides a method for evaluating chemical grouting in coal mines based on the above-mentioned real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines, including the following steps: S1: Obtaining grouting parameters during the grouting process; the grouting parameters include flow rate, grouting pressure, and reaction temperature.
[0041] S2: Calculate the pass / fail index for each grouting parameter. The formula is as follows: in, Let i be the qualification index of the i-th grouting parameter. Let be the measured value of the i-th grouting parameter. Let be the minimum value of the i-th grouting parameter. The maximum value of the i-th grouting parameter. These are the optimal grouting parameters.
[0042] S3: Calculate the overall qualification index based on the qualification index of each grouting parameter. The formula is as follows: in, The overall qualification index, The weight of the i-th grouting parameter, Let be the pass / fail index for the i-th grouting parameter, and n be the number of grouting parameters. Based on the importance of different projects, the weights of different parameters are adjusted, and nonlinear corrections are applied to key parameters affecting the grouting effect, resulting in multi-level judgments.
[0043] S4: Evaluate the grouting process based on the comprehensive qualification index. Specifically, this includes: determining the grouting process as unqualified when the comprehensive qualification index is zero or less than the comprehensive qualification index threshold; and determining the grouting process as qualified when the comprehensive qualification index is greater than or equal to the comprehensive qualification index threshold.
[0044] The above method also includes: establishing a standard curve for grouting parameters; establishing a real-time curve for grouting parameters based on the real-time collected grouting parameters; and comparing the standard curve for grouting parameters and the real-time curve for grouting parameters to determine whether impurities have been mixed into the grout.
[0045] Select a sensor with matching weather resistance and sensitivity, calibrate the sensor, use a liquid with a known refractive index to calibrate the sensor error as a reference value, measure the sensor signal, establish a signal change-refractive index curve, and form a standard curve.
[0046] Grouting construction consists of two processes: grouting hole construction and grouting. Grouting hole construction is carried out according to the site conditions, divided into several rows. The sequence of grouting holes is generally based on the area division. During the construction of each row, a top-down, skip-row method is used, taking into account the grout diffusion radius and proceeding one hole at a time. During the grouting process, the grouting effect is evaluated on each hole according to the above-mentioned assessment methods. Based on the regional drilling quantity and grouting results, a grouting hole drilling and grouting effect that reaches 95% or more of the standard is considered qualified. Supplementary grouting is then carried out according to different drilling locations and grouting volumes on site, forming relevant measures and results.
[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0048] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines, characterized in that, include: A grouting device and a grouting monitoring instrument are included. The grouting device comprises a grouting pump, two material tanks, a flow meter, a pressure regulating valve, multiple pressure transmitters, a check valve, and multiple temperature sensors. The two material tanks contain grouts of different chemical grouting materials. The grouts from the two material tanks are mixed by the grouting pump and then injected into the grouting hole. Each material tank is equipped with a flow meter, regulating valve, pressure transmitter, and check valve on its connecting pipeline to the grouting pump. Temperature sensors are installed at different depths of the grouting hole. A pressure monitoring instrument is installed on the connecting pipeline between the grouting pump and the grouting hole. The system includes a transmitter; a flow meter for regulating the flow rate of grout from different chemical grouting materials into the grouting pump; a pressure transmitter for collecting the grouting pressure of grout from different chemical grouting materials and the grouting pressure of mixed grout; a temperature sensor for collecting the grout reaction temperature at different depths of the grouting hole at different grouting stages; and a grouting monitoring instrument electrically connected to the flow meter, pressure transmitter, and temperature sensor for real-time monitoring, adjustment, and display of grouting parameters during the grouting process. The grouting parameters include flow rate, grouting pressure, and reaction temperature.
2. The real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines according to claim 1, characterized in that, The system also includes a viscosity tester installed on the connecting pipeline between each material tank and the grouting pump, the viscosity tester being used to collect the viscosity of grout from different chemical grouting materials.
3. The real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines according to claim 1, characterized in that, The system also includes an optical fiber sensor installed on the connecting pipeline between each material tank and the grouting pump. The optical fiber sensor is used to collect the refractive index of the grout of different chemical grouting materials.
4. The real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines according to claim 1, characterized in that, The system also includes a toxic and harmful gas sensor, which is installed at the grouting pump and the grouting hole to collect the concentration of toxic and harmful gases generated when grouts of different chemical grouting materials are mixed and the concentration of toxic and harmful gases overflowing from the coal and rock mass during the grouting process of the mixed grout.
5. The real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines according to claim 1, characterized in that, The system also includes: pH sensors, installed on the connecting pipes between each material tank and the grouting pump, and on the grouting pump, for collecting the pH value of grout from different chemical grouting materials and the pH value of mixed grout.
6. The real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines according to claim 1, characterized in that, The grouting monitoring instrument includes a main unit and a power supply; the main unit includes an explosion-proof housing, a data processor disposed within the explosion-proof housing, and a display screen disposed on the explosion-proof housing; the power supply is used to power the main unit; The data processor is electrically connected to the flow meter, the pressure transmitter, and the temperature sensor via a data interface, and is used to monitor and adjust the grouting parameters in real time during the grouting process; the display screen is used to display the grouting parameters during the grouting process.
7. The real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines according to claim 6, characterized in that, The power supply is equipped with a battery explosion-proof housing, a battery switch, and a battery interface.
8. The real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines according to claim 6, characterized in that, The host explosion-proof housing is equipped with a mouse touch controller.
9. The real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines according to claim 6, characterized in that, The grouting monitoring instrument also includes an alarm module connected to the data processor, used to issue an alarm when the data processor detects that the grouting parameters exceed a preset range.
10. The real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines according to claim 6, characterized in that, The grouting monitoring instrument also includes a 3D display module for grouting holes, which is used to display the grouting holes and the grouting process in three dimensions.
11. The real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines according to claim 6, characterized in that, The grouting monitoring instrument also includes a grouting design module, used to design grouting based on the grout of different chemical grouting materials, grouting pumps, grouting hole parameters, and grouting sequence; the grouting hole parameters include spacing, row spacing, and hole depth.
12. The real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines according to claim 1, characterized in that, The system also includes a communication module and an AI module; the communication module is used to upload grouting parameters to the AI module, and the AI module combines the engineering database to evaluate the grouting construction quality and provide guidance.
13. The real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines according to claim 12, characterized in that, The grouting parameters are encrypted during transmission.
14. A method for evaluating chemical grouting in coal mines, characterized in that, The method is applied to the real-time multi-parameter component analysis monitoring system for chemical grouting in coal mines as described in any one of claims 1-13. The method includes: acquiring grouting parameters during the grouting process; the grouting parameters include flow rate, grouting pressure, and reaction temperature; calculating the qualification index of each grouting parameter; calculating a comprehensive qualification index based on the qualification index of each grouting parameter; and evaluating the grouting process based on the comprehensive qualification index.
15. The method for evaluating chemical grouting in coal mines according to claim 14, characterized in that, The formula for calculating the pass index of each grouting parameter is as follows: in, Let i be the qualification index of the i-th grouting parameter. Let be the measured value of the i-th grouting parameter. Let be the minimum value of the i-th grouting parameter. The maximum value of the i-th grouting parameter. These are the optimal grouting parameters.
16. The method for evaluating chemical grouting in coal mines according to claim 14, characterized in that, The formula for calculating the overall pass rate is: in, The overall qualification index, The weight of the i-th grouting parameter, Let n be the qualification index of the i-th grouting parameter, and n be the number of grouting parameters.
17. The method for evaluating chemical grouting in coal mines according to claim 14, characterized in that, The grouting parameters are evaluated based on the comprehensive qualification index, specifically including: when the comprehensive qualification index is zero, or when the comprehensive qualification index is less than the comprehensive qualification index threshold, the grouting process is deemed unqualified; when the comprehensive qualification index is greater than or equal to the comprehensive qualification index threshold, the grouting process is deemed qualified.
18. The method for evaluating chemical grouting in coal mines according to claim 14, characterized in that, The evaluation method for chemical grouting in coal mines further includes: establishing a standard curve for grouting parameters; establishing a real-time curve for grouting parameters based on the real-time collected grouting parameters; and comparing the standard curve for grouting parameters with the real-time curve for grouting parameters to determine whether impurities have been mixed into the grout.