Rock stress monitoring system

System Overview:
Mine tunnels, highway tunnels, etc. are artificial passages that pass through rock layers, and their reliability and safety are particularly important. Due to the enormous destructive power of collapse accidents, they not only cause production and transportation disruptions, affecting the development of the national economy, but also bring huge economic losses and casualties, which will have a very negative social and political impact.
In 2006, the State Council issued the "National Medium - and Long Term Science and Technology Development Plan Outline", which required focused research on monitoring, early warning, and prevention technologies for production accidents such as bridges and coal mines, sudden social security incidents and natural disasters, nuclear safety, and biological safety. Therefore, the country attaches great importance to the development of safety monitoring and early warning technologies for large public facilities such as mine tunnels and highway tunnels.
In response to the aforementioned requirements, Hangzhou Shanghang has launched the SH-TUNNEL2001 series rock stress online monitoring system specifically for bridge conditions, based on years of experience in earthquake prevention and disaster reduction monitoring. This system is an online monitoring system independently developed by the company, providing a good solution for continuous monitoring of the status of mine tunnels and highway tunnels.
Scheme composition:
In this scheme, the rock stress monitoring system mainly consists of a monitoring host, system software, data transmission interface, data acquisition substation, various sensors, lightning arresters, and transmission network. It analyzes and warns of the stress, strain, and displacement of the surrounding rock and dam of the mine, tunnel goaf, and bridge pillar structure, and analyzes the monitoring results of each measuring point, thereby greatly improving the accuracy of disaster monitoring. The monitoring system is shown in Figure 1.


The monitoring host communicates with the data acquisition substation and is responsible for tasks such as analyzing and processing system monitoring data, real-time display, statistical storage, screen display, query and printing; The system software completes the data collection, processing, processing, display, storage, query, and report printing of each measuring point; The communication network mainly completes the transmission and communication functions of measurement data; Various sensors are used to monitor and collect data on the on-site environmental parameters of each monitoring point, display them on site, and transmit information.
The system uses two monitoring hosts to achieve dual machine hot backup, and all monitoring data uploaded by the data collection substation is simultaneously written to the monitoring host and backup machine databases. Through the RS485 communication bus, the monitoring center station is connected to various data acquisition substations, and the entire system can form a distributed tree network data acquisition system. The transmission distance of the RS485 bus connected to each node can reach 1200m.
Rock stress monitoring is mainly aimed at ensuring the safety of tunnels and key chambers. Therefore, monitoring sections are selected on the tunnels to monitor stress changes and roof displacement on the sections to ensure the safety of the tunnels. The monitoring projects include displacement monitoring (including displacement changes of different rock layers inside the tunnel and deep displacement changes near the vertical shaft wall, as well as convergence changes of key transportation tunnels), stress monitoring (stress changes inside the rock mass of the tunnel wall and key chambers), and deformation monitoring (deformation monitoring of the tunnel and key chambers). The schematic diagram of the monitoring section is shown in Figure 2.

System performance:
1) Key indicators can be automatically monitored and alarmed online;
2) Using waterproof aviation joints, easy installation and maintenance, good waterproof and dustproof performance;
3) Powerful software processing capabilities: Real time display, storage, over limit alarm, SMS alarm, data analysis, and print output of various monitoring data have been achieved;
4) Single bus real-time data transmission, simple wiring, low maintenance cost, and high system stability;
5) Fault self check, dual machine hot backup, and backup power supply ensure the stability and reliability of system operation;
6) Distributed network structure, some instrument failures do not affect system operation, and the system has good scalability.
(Editor in charge: admin)