With the development of underground transportation, in order to reduce impact on surrounding environment and traffic, Hejiaying subway island station adopts concealed excavation method. During construction process, considering method, tunnel layout, ventilation requirements, working face as a multi-conductor cave, more stringent requirements are put forward for tunnel. Through combination theor...

At the ultra-high frequencies (UHF) common to portable radios, the mine tunnel acts as a dielectric waveguide, directing and absorbing energy as a radio signal propagates. Understanding radio propagation behavior in a dielectric waveguide is critical for designing reliable, optimized communication systems in an underground mine. One of the major parameters used to predict the power attenuation ...

Tunnel monitoring is an important task in civil engineering that aims at determining the stability and safety of a structure by using information about its deformations. In this paper we present the development and the results of a fast method for displacement measurement based on digital images, which allows a deformation analysis along the cross-sections of a tunnel. This technique was create...