Measurement and real-time visual presentation of ground deformation ahead of mountain tunneling face using optical fibers

摘要

There is an urgent need of new strategy for the monitoring of ground movement ahead of mountain tunnel face to improve the safety management.A new sensor is under development for the monitoring based on the concept of "On Site Visualization".This method is different from the conventional field measurement techniques in that deformation is measured on site and visualized by different colors of light in real-time.Since this method makes use of optical fibers as the light propagation medium,it could keep on visualizing the displacement of measuring points even if its front part is cut as needed during excavation.The paper presents some laboratory experiments to demonstrate the applicability of this scheme.By doing this,it is found possible to monitor the ground deformation by the proposed sensor.Finally,some work in future is discussed briefly.