Research On Transient Fault Analysis And Emergency Control For Construction Tunnel Wireless Monitoring And Control System

Construction tunnel is a kind of underground project, where because of the special geographical environment, the problems of the construction safety and the operation safety of tunnels have stuck out. Establishing the synthesis monitoring and control system for tunnel construction is an effective way to cope with these problems. Tunnel is a space with narrow and close property, severe environment, and high accident potential, where the sensor nodes are strategically deployed with chain-type topology along relatively long distances and the traditional schemes of wireless sensor network are not available; secondly, transient faults form the dominant fault class in many computer systems. Because of their transient nature and short duration, it is difficult to detect and locate them in the traditional safety analysis way; moreover, to deal with the emergency situation demands the monitoring network with the characteristic of real-time and reconfigurability. These are the urgent issues to tackle, when the wireless monitoring and control system is designed. In this study, we took the optimization of the deployment for monitoring network, the transient fault of tunnel construction and safety control technology under emergency situation into consideration.In the paper, when we designed the tunnel construction monitoring and control system, after describing tunnel by two-dimensional grid model, a genetic algorithm with niche technology was used relevantly to improve the general deployment. To analysis the transient fault in the system, a safety analysis approach based on system theory was proposed. An operational process model was abstracted to educe potential risk in the dysfunctional interactions of the system, and then effective safety constraints were set up and safety monitoring network parameters were found. To meet the requirement of the emergency situation in the tunnel construction, a cross-layer emergency communication protocol was studied under the condition of emergency situation to ensure a rapid reconfigurable network. In the network layer, an emergency routing protocol based on Directed Diffusion, DD-ERP, had been proposed. Furthermore, the availability of the above methods has been proved by the experimentsThrough these work, the reliability, robustness and real-time of the tunnel construction monitoring and control system have been observably improved, and the ability of the system to handle fault event has been enhanced.