application area

A large number of coal mine water inrush accidents have shown that the vast majority of water inrush (seepage) accidents are induced by mining engineering activities. The fine exploration technology for concealed water sources and water channels, as well as the short-term critical prediction technology for water inrush, are bottleneck technologies that restrict the effectiveness of coal mine water prevention and control. At present, there is a serious lack of automatic monitoring technology and equipment, which cannot provide real-time and reliable monitoring and early warning of mine water during the mining process. To this end, the Ministry of Science and Technology and the State Administration of Work Safety organized an expert group to discuss and approve the project. The research and development team led by Professor Yue Jianhua from China University of Mining and Technology undertook the "Key Technologies and Equipment Research and Development for Prevention and Control of Major Accidents such as Coal Mine Water inrush and Fire" project of the National "Twelfth Five Year Plan" Science and Technology Support Program. Among them, real-time online dynamic monitoring and early warning technology for major mine water inrush disasters is an important topic. The KJ445 online monitoring system is the product of the scientific research achievement transformation. This system has obtained the national safety standard certification and is officially put into production use.

monitoring content

System advantages and innovation points

1. Real time online collection, monitoring, and transmission;

2. "Hydrological monitoring+water quality monitoring": Hydrological monitoring includes flow rate, temperature, pressure monitoring, dynamic change monitoring of various parameters, and analysis of mutual change trends; Water quality monitoring includes parameters such as pH value, conductivity, oxidation-reduction potential, etc. It mainly focuses on monitoring and analyzing changes in water composition, in order to identify changes in water source types and provide reliable water quality data for timely detection of dangerous situations;

3. The system provides various diagnostic functions, including communication transmission status, sensor, substation fault classification statistics, and self fault diagnosis of the monitoring system;

4. Self diagnostic function

If there are abnormalities in the communication transmission status, sensors, substation collection, communication, etc. of the system, it has a fault self diagnosis function and can be displayed on the equipment and system display in the form of text, icons, etc Displayed above.

5. Information sharing and interconnection

(1) The system software can achieve communication between general users of the management department and the host of the monitoring center station, complete information publishing functions, and generate corresponding work reports and curves according to user requirements.

(2) The system software can achieve monitoring and deployment of a single mine, as well as comprehensive deployment of multiple mine networks.

(3) The system software can listen to data query requests from remote or local clients, and then obtain relevant data through data requests sent to the database server based on the user's query requests. The resulting data is converted into standard HTML web pages and transmitted back to the client's browser for display to the user. Users can independently query data, generate reports, and generate graphical curve reports.

major function

1. Advanced prediction and forecast structure of excavation tunnels and their water yield properties

When conducting advanced detection in excavation tunnels, electrical data acquisition cables and electrode controller substations are suspended or buried on one side of the tunnel behind the excavation head, and electrical data acquisition work stations are installed for data acquisition.

With the continuous advancement, the data acquisition system also keeps up and detects hidden structures and changes in water abundance within a 100m range ahead in real time.

When there is a large water rich area or signs of sudden water influx within the detection range ahead, the system will automatically sound an alarm.

2. Monitoring and Effect Evaluation of Bottom Plate Grouting Reinforcement Process

When grouting reinforcement and renovation are carried out, the monitoring system should be installed in the renovation area to monitor the diffusion of grout in real time during the grouting process, adjust the grouting plan in real time, and detect the completion quality of the grouting reinforcement and renovation project.

When areas with poor grouting effect are found, secondary grouting or other preventive measures should be implemented to achieve the best grouting effect and ensure safe mining in the later stage.

3. Monitoring and early warning of pressurized water on the bottom plate of the mining face

During the backfilling of the working face, the system is installed along the bottom plate of the trench above and below the working face that needs to be monitored, to detect hidden structures and changes in water abundance within a range of 100m from the bottom plate in real time.

With the progress of mining operations in the working face, the stress conditions around the mining environment change, and mining induced fractures begin to develop. Under pressure, pressurized water invades along the fractures, causing changes in the water rich area.

When the relevant parameters of the rich water area exceed the warning value, the warning information can be uploaded to the monitoring center server through the underground communication network and automatically alarmed, so that the relevant responsible persons can make timely water prevention and control decisions.

4. Real time monitoring and early warning of delayed water inrush in goaf

Real time monitoring of changes in low resistance abnormal areas in goaf plays a crucial role in ensuring the safety of mining operations.

During the mining process, pre-set data collection cables are left in the goaf to monitor real-time changes in the water content of the goaf.

When there is a low resistance anomaly in the goaf and the system's warning strategy determines that there is a risk of delayed water inrush, the system will automatically sound an alarm.

5. Comprehensive real-time monitoring of hydrological information in mines

Real time measurement and collection of water temperature, water level, pipeline flow rate, pH value, conductivity, redox potential, and other data are essential for timely understanding of groundwater dynamics and ensuring the safety of mines

It has significant practical significance.

The system can transmit real-time parameters such as water temperature, water level, and water pressure in various observation boreholes and water tanks within the well field to the network center through the system network, to predict the water inflow of mining, excavation, and excavation work faces, and timely grasp the dynamic changes of groundwater level.

When the monitoring data exceeds the allowable range of the warning strategy, the system will automatically sound an alarm.