ABSTRACT: Sensors of the new type are developed for simultaneous monitoring and visualization of risk conditions for geomechanics applications to achieve an advanced safety management scheme using “color of light” as a key technology of the proposed method. These sensors are designed and built based on the new monitoring concept called “On Site Visualization” and capable of 1) sensing data and 2) visually outputting the measurement results simultaneously by using LED for workers and all concerned. This new monitoring scheme may be applied to tunneling, rock slope cutting, open-cut excavation problems, etc., whereby real-time visual presentation of monitored information may be fully incorporated to achieve an advanced safety management scheme.
1. INTRODUCTION Sensors of the new type are developed for simultaneous monitoring and visualization of risk conditions for geomechanics applications to achieve an advanced safety management scheme using “color of light” as a key technology of the proposed method. This paper first introduces the basic concept of the new scheme, On Site Visualization, and gives brief explanations of the light emitting devices developed so far. In Japan, the OSV has been applied at more than 30 locations where tunnels, slopes, bridges, open excavations etc. were monitored with light emitting sensors. The OSV was also applied successfully to improve safety management practices at Delhi Metro construction sites in New Delhi, India. The employment of the OSV enables real-time data processing and visualization on-site, so that the state of deformation, strain, inclination, earth pressure etc. can be grasped with no delay in time and is shown visually to anyone nearby as the color of light. Rationally designed use of this method could give us early warning signs, if any, and minimize risks not only during construction of underground infrastructures but also during their service time.