Development Of Real-time Monitoring System For Tunnel Deformation Based On LoRa Wireless Communication

During tunnel construction,in order to ensure the safety and quality of construction personnel,it is necessary to measure various parameter indicators of the tunnel according to the construction progress.Among them,the settlement of the arch crown and the convergence of the surrounding area are the most representative detection items.The traditional manual measurement generally adopts convergence meter,total station and other methods,which has problems such as long measurement period,low frequency and impact on construction progress.This article studies and designs a real-time monitoring system for tunnel deformation based on LoRa wireless communication technology,ARM embedded technology,laser ranging sensors,cloud computing,and mobile web technology.The main content is as follows:1.Analyze and compare existing tunnel monitoring technologies,and combine them with the actual working conditions and requirements during tunnel construction to determine the use of laser ranging sensors as a means of collecting tunnel deformation.By analyzing and comparing various commonly used wireless signal transmission technologies,and using ray tracing method to simulate the LoRa wireless channel in tunnel environment,it was determined that LoRa technology is the main wireless communication method of the system.On this basis,the overall design of the system was carried out.Clarified the basic architecture of the system.2.According to the data acquisition requirements and other performance indicators of the tunnel Deformation monitoring system,the hardware design of the tunnel Deformation monitoring terminal is carried out.This includes the selection of the main controller,laser ranging sensor,environmental monitoring sensor,and LoRa wireless communication module,as well as the design of data acquisition circuits and LoRa wireless transmission circuits for each sensor.3.According to the overall design and hardware architecture of the tunnel Deformation monitoring system,the software part of the system is designed.The software design content includes circuit driver program design,monitoring cloud platform,and client development.The driver program design of the circuit enables the terminal to achieve real-time data collection function.By designing cloud platforms and clients for functionality and interfaces,the collected data can be presented accurately and in real-time,achieving the goal of intuitive display and operation.4.Finally,install and debug the system.It includes laser sensor accuracy test,tunnel Deformation monitoring terminal data acquisition test,LoRa signal transmission distance test and cloud platform and client function test.The experiment shows that all parts of the system have achieved the expected indicators.