Research on Measuring Bridge Foundation Settlement Evaluation Based on BOTDA Technology
In order to further improve the accuracy of bridge foundation settlement assessment,this paper proposes to apply BOTDA technology to foundation settlement monitoring.By building a soil settlement simulation test device based on BOTDA,different working conditions are simulated for soil settlement tests.The experimental results show that when the displacement value between fixed points in operating condition 1 is 0 m,the maximum strain value for different settlement displacements is 2 700 με,and the minimum strain value is 0.As the displacement values between fixed points vary within the range of 0-2 meters,the strain values of different settlement displacements change less.Under condition 2,the settle-ment of the bridge foundation shows negative strain followed by positive strain as the displacement increases.By using ground anchors to fix the optical fiber,the strain transmission performance of the fiber is further increased,and the strain monitoring range is expanded.Therefore,in ac-tual foundation settlement monitoring,ground anchors should be used to fix optical fibers to improve the accuracy of bridge foundation settlement monitoring.
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