Application of a Remote Real-Time Monitoring System in an Open-Cut Tunnel
(1 China Railway Southwest Research Institute Co. Ltd., Chengdu 611731; 2 Department of Maintenance and Repairing, Chengdu Railway Bureau, Chengdu 610081)
Abstract：
Focused on an open-cut tunnel structure near a landslide site on the Sichuan-Guizhou railway, a re?
mote real-time monitoring system was applied to constantly monitor the rock stress, reinforcement stress and concrete stress. The monitoring system has such functions as data collection, remote data transmission, real-time display by data curves, monitoring and early-warning, etc. The monitoring data of the open-cut tunnel indicate: when the filling in of the soil above the open-cut tunnel is completed, the structural internal force tends to be stable along with a decrease of construction loading and a consolidation of the soil mass; additionally, the reinforcements and concrete on both side walls of the open- cut tunnel is presented as being tensioned outside and compressed inside,which means the structure is affected by an unbalanced pressure, and this conforms to the actual situation. Engineering practices show the force applied on an open-cut tunnel structure can be known in a timely manner by the realtime monitoring system, while the normal operation of the existing railway won′t be affected—thus it is suitable for
the long-term monitoring of an open-cut tunnel structure during operation.
2017, Vol. 54 