1、 System background

In transportation construction, tunnel construction is a relatively dangerous part. During tunnel excavation, it is easy to encounter situations such as collapse of the tunnel working face, mud inrush, and water inflow. Especially in the distance between the secondary lining trolley and the tunnel face, the tunnel has not been reinforced and supported, and coupled with the concentration of workers on the tunnel face, major accidents are prone to occur. Therefore, in tunnel construction, it is important to pay attention to monitoring the safety step distance of the tunnel.

2、 System Introduction

During the tunnel construction process, there are strict requirements for the safety step distance of the tunnel. Generally, the requirements for step distance vary depending on the level of surrounding rock. For example, the distance between the inverted arch and the third level surrounding rock of the tunnel face should not exceed 90m; the distance between the fourth level surrounding rock should not exceed 50m, and the distance between the fifth level and above surrounding rock should not exceed 40m or according to design requirements; The distance between the secondary lining and the face of the tunnel shall not exceed 200m for Class I and II surrounding rocks, 120m for Class III surrounding rocks, 90m for Class IV surrounding rocks, and 70m for Class V and above surrounding rocks. This system installs a safety step distance collection terminal based on millimeter wave radar at the secondary lining or inverted arch position, and sends the step distance information in real-time to the server's database through the collection terminal via wireless network. The system calculates the step distance length through model algorithms and provides over limit warnings based on the type of surrounding rock.

3、 System architecture

4、 System functions

1. Real time monitoring of safety step length information and transmission of information to the monitoring center.

2. Real time warning of safe step length based on the type of tunnel surrounding rock.

3. Real time display of historical trends in step length through data statistics and analysis.

4. Support comprehensive query of online monitoring data for tunnel safety step distance.

5、 System features

1. Basic information: Display the basic information data of online monitoring of tunnel safety step distance.

2. Real time monitoring data: Real time display of online monitoring data on tunnel safety step distance. Fully automated online monitoring of tunnel deformation, stress, environment, etc., to real-time grasp the overall safety status of tunnel construction and operation.

3. Warning information management: Real time warning for tunnels that exceed the safety step warning threshold. When the data is abnormal, the system will trigger the corresponding level alarm mechanism and notify the user in the form of SMS, fax, broadcast, etc. as soon as possible.

4. Emergency plan handling: Extract corresponding handling methods directly from the expert database, take timely measures such as personnel intervention and road blockade, and eliminate safety hazards in their infancy.

5. Comprehensive data query: Supports comprehensive query of online monitoring data for tunnel safety step distance. The storage of monitoring data provides an analogy basis for the design and construction of similar projects in the future.

6. Statistical report: Display the statistical report of online monitoring of tunnel safety step distance in the form of charts.

6、 Software interface diagram