中国激光, 2019, 46 (11): 1110001, 网络出版: 2019-11-09
锚固增强传感光缆-土体耦合性的试验研究 下载: 712次
Improvement of Mechanical Coupling Between Fiber-Optic Sensing Cable and Soil Mass by Anchoring
光纤光学 光缆-土体耦合性 圆片锚固 低围压 拉拔试验 fiber optics fiber-soil coupling wafer anchor low confining pressure pull-out test
摘要
将分布式光纤监测技术应用于土体变形监测时,传感光缆与周围土体的耦合性是关键。低围压下光缆-土体变形协调性将严重影响测量数据的准确性。设计了锚固光缆,进行了光缆-土体拉拔试验,探究了低围压下回填料及锚固方式对光缆-土体耦合性的影响。试验结果表明:回填料对光缆-土体耦合性存在明显的影响,黏土含量(质量分数)越高,耦合性越好;低围压下,采用在传感光缆上增加圆片锚固的方式,可以有效增强光缆-土体耦合性,并且随着锚固间距的减小和锚固圆片直径的增大,其耦合性增强。
Abstract
The coupling of the sensing cable to the surrounding soil is essential to the application of distributed optical fiber monitoring technology for monitoring soil deformation, particularly the coordination of fiber-soil deformation under low confining pressures, which seriously affects the accuracy of the measurement data. In this study, the anchored fiber-optic cable is designed and the fiber-soil pull-out test is performed to investigate the effects of backfill material and anchoring method on fiber-soil coupling under low confining pressures. Results show that the backfill material considerably affects the fiber-soil coupling. The higher the clay content is, the better the coupling is. Under low confining pressures, the fiber-soil coupling can be effectively enhanced by adding the wafer anchor into the sensing cable. Decreasing anchor interval and increasing anchor diameter can improve the fiber-soil coupling.
蒋娜, 吴静红, 刘浩, 施斌, 刘苏平, 魏广庆. 锚固增强传感光缆-土体耦合性的试验研究[J]. 中国激光, 2019, 46(11): 1110001. Na Jiang, Jinghong Wu, Hao Liu, Bin Shi, Suping Liu, Guangqing Wei. Improvement of Mechanical Coupling Between Fiber-Optic Sensing Cable and Soil Mass by Anchoring[J]. Chinese Journal of Lasers, 2019, 46(11): 1110001.