Abstract
Considering the differential settlement in the junction between the structure perpendicular to the dike and the body and foundation of dike (called the earth-rock junction in this paper) during runtime, an experimental investigation of optical fiber sensor monitoring was conducted. Based on the sensing mechanism of single-mode optical fiber bending loss, the experiment focused on the influence of the bending radius of an optical fiber on the bending loss. In view of the characteristics of the differential settlement in the earth-rock junction, we designed a butterfly-type optical fiber sensor and composite optical fiber sensor for monitoring device in monitoring the differential settlement to enlarge the monitoring range and improve the sensibility of optical fiber sensor. Based on the research on the working principle and bending properties of the composite optical fiber monitoring device, we conducted experiments on the bending of the composite optical fiber sensor monitoring device and the use of the device for monitoring the differential settlement. These experiments verified the feasibility of the composite optical fiber sensor monitoring device at monitoring the differential settlement in the earth-rock junction.
Highlights
Dike projects have played important roles in increasing the social benefits of flood control, irrigation, water supply, and navigation
A monitoring device and monitoring methods based on the theory of bending loss were studied, which provided technical support for the optical fiber sensor applied in monitoring the differential settlement of the earth-rock junction
By analyzing the relationship between the optical loss and bending radius, we found that the single-mode optical fiber has weaknesses in its small monitoring range and low monitoring sensibility
Summary
Dike projects have played important roles in increasing the social benefits of flood control, irrigation, water supply, and navigation. The current, monitoring equipment for structures across dikes includes a clinometer, settlement gauge, vibration string joint meter, and vibration string displacement meter. Such monitoring equipment has the disadvantages of high unit cost, poor durability, low accuracy, easy interferences under high temperature and electromagnetism, and failure to recognize distributed monitoring. An optical fiber sensor can provide sensing and transmission monitoring and is capable of functioning remotely. It boasts the features of being light in weight and small in volume, having less effect on the structure. Once connected with a computer, the monitoring system can be Journal of Sensors automated and intelligent, capable of distanced monitoring the structural damage
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