Tunnel online monitoring
Because the tunnel can shorten the mileage, protect the environment, improve the shape of the line, and improve the conditions for the opening of the highway, modern expressways, which encounter complex terrain and geological conditions, mostly use tunnel construction. The tunnel is a hidden underground project. The underground geological conditions are complex. There are many potential and unpredictable geological factors. These are linear projects, some of which are large and can reach several kilometers and dozens of kilometers. They often travel through many different environments. Airspace and time domain, engineering conditions are often more complex, and sometimes the environment is very poor, with little, it will cause landslides, subsidence, sudden muddy water, deformation of supporting structures, personnel and equipment damage, etc., and then seriously affect the safety of the tunnel. In order to ensure the safety of tunnel projects and timely forecast of dangerous conditions, it is very important to monitor and evaluate the safety and stability of tunnel projects. It is mainly through the means of monitoring to understand the operation of the tunnels. The established monitoring system tends to monitor, evaluate, and predict tunnel projects. To avoid disadvantages has become an urgent need for the development of modern tunnel projects.
Tunnel monitoring system composition
The system consists of a sensory layer, a transmission layer, and an application layer. Specifically, it is a sensor system, a data acquisition subsystem, a data transmission subsystem, a database subsystem, a data processing and control system, a security evaluation and early warning subsystem, and is coordinated through various layers. Implement various functions of the system.
The automated monitoring sensor subsystem serves as the sensing layer and is the basic part of the entire monitoring system. It can provide true, real-time and reliable safety monitoring data for all monitoring items of the monitoring structure under severe conditions. The sensor subsystem converts the changes in the structure into other signals, such as sound, light, electricity, and magnetism. It quantifies the changes in the structure and converts it into familiar values, so as to understand the force of the structure and Other parameters and so on.
Data Acquisition Subsystem
The data acquisition subsystem collects the environmental conditions measured by the sensor subsystem and the structure's own acoustic, optical, electrical and magnetic signals, and processes the signals into digital signals. The data acquisition subsystem should have a certain diagnostic function. It can quickly distinguish abnormal information data, sensor failures and damaged parts, and ensure that the system can be used in harsh climate conditions (such as rain, snow, hurricane, earthquake, rainstorm, etc.). Under normal operation, continuous collection and transmission tunnels and gas pipelines are used to safely monitor the information data of each monitoring item.
Tunnel monitoring content
(1) Observational description of surrounding rock and supporting conditions;
(2) Surface subsidence;
(3) Tunnel dome settlement;
(4) Tunnel convergence monitoring;
(5) Oblique monitoring of nearby buildings;
(6) Pore pressure monitoring;
(7) Earth pressure monitoring;
(8) Soil vertical displacement monitoring;
(9) Soil displacement monitoring.
Tunnel construction monitoring
Tunnel operation period monitoring