Experimental study of distributed optical fiber sensor in measuring the deformation of large filling bag with dredged soil

It is very significant to research the key technology of adopting the dredged soil as new construction material in port engineering for the resources shortage and environmental restriction. The traditional point-supporting measuring technology could not be utilized to measure the deformation of large filling bag in its filling and loading process. The engineering practical problems such as measuring the deformation of large filling bag with dredged high clay content soil received much concern at the present stage. Based on the laboratory calibration tests and filed prototype tests, the selection of optical fiber sensor, cemented fixation and protection, measuring accuracy and error analysis, application testing in project prototype were carried out in this paper. And the application feasibility of distributed optical fiber sensor to measure the deformation of large filling bag with dredged soil was discussed. The results showed that the optical fiber sensor with flexible sheath should be adopted for measuring the deformation of large filling bag with dredged soil. And the measuring accuracy would be ±30με with apposite optical fiber sensor. The monitoring spatial resolution could be 0.1m. The maximum strain measurement range could be 30000με. The distributed optical fiber sensor could be adopted as a new reliable method to monitor the deformation of large filling bag with dredged soil.