Use of Brillouin optical time domain reflectometry to monitor soil-cave and sinkhole formation

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• 作者：Xiaozhen Jiang ; Yongli Gao ; Yuanbin Wu ; Mingtang Lei
• 关键词：Sinkhole monitoring ; BOTDR ; Geohazard ; Karst collapse
• 刊名：Environmental Earth Sciences
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：75
• 期：3
• 全文大小：1,892 KB
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• 作者单位：Xiaozhen Jiang (1)
  Yongli Gao (2)
  Yuanbin Wu (1)
  Mingtang Lei (1)
  
  1. Institute of Karst Geology, CAGS, Guilin, 541004, China
  2. Department of Geological Sciences, University of Texas at San Antonio, San Antonio, TX, 78249, USA
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

With the economic development in China, sinkholes have become one of the main geological hazards during highway, railway and oil-pipe construction in the karst regions of southwestern China. This paper introduces an experimental study of monitoring the process of sinkhole collapse using Brillouin optical time domain reflectometry technology. In a series of tests of an experimental model, sinkholes are induced by pumping simulated karst water. Real time strains of optical fibers buried in sediments and soil damages are measured. One segment of soil along with buried optical fibers was excavated to verify the final positions of optical fibers and their relation to soil deformation. Results of the experimental study demonstrate that positions of peak strain in optical fibers correspond well to areas of maximum disturbance and soil void formation. Changes of optical fiber strains in different soil layers are good indicators of vertical disturbance in soil. Time series of optical fiber strain analysis exhibit the progress of horizontal disturbance in soil.