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| Discussion on Schemes for Monitoring Post-construction Subsidence of Subgrade of Zhengzhou-Xi'an Passenger Dedicated Line |
| HAO Jin-yu, ZHU Shao-jie |
| Zhengzhou Railway Administration, Zhengzhou, Henan 450052, China |
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Abstract Research purposes：According to the special requirements of monitoring the post-construction subsidence of the subgrade of Zhengzhou-Xi'an Passenger Dedicated Line in moist loess area, the analysis of the defects of the existing two schemes for monitoring post-construction subsidence is made. Based on the technology development and research of fibre light grid transducer and its monitoring application in civil engineering, the discussion is made on the possibility of using the fibre light grid transducer to monitor the post-construction subsidence of the subgrade of the passenger dedicated line in moist loess area.
Research conclusions：From the analysis and discussion it is concluded the fibre light grid transducer can realize long-distance (50m), quasi-distributed, multi-spots and multi-parameter measurement with the high measurement accuracy. It can accurately measure the vertical displacement change of less than 0.1mm (relative to the reference base), and it is suitable for long-term monitoring with the good capacity of electromagnetic interference resistance and can satisfy the requirement of long-term monitoring the post-construction subsidence of subgrade of Zhengzhou-Xi'an Passenger Dedicated Line in moist loess area.
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Received: 22 January 2010
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2010, Vol. 27 
