Bibliographic Details
| Title: |
Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation. |
| Authors: |
Han, Heming1,2 (AUTHOR) hanheming@smail.nju.edu.cn, Shi, Bin1 (AUTHOR) shibin@nju.edu.cn, Yang, Yaowen1,2 (AUTHOR) cywyang@ntu.edu.sg, Zhang, Cheng-Cheng1 (AUTHOR) zhang@nju.edu.cn, Zhang, Lei3 (AUTHOR) thuzhangl@tsinghua.edu.cn, Wei, Guangqing4 (AUTHOR) wgq@nzsensing.com |
| Source: |
Engineering Geology. May2023, Vol. 317, pN.PAG-N.PAG. 1p. |
| Subjects: |
Plastic analysis (Engineering), Fiber Bragg gratings, Boreholes, Excavation (Civil engineering), Material plasticity, Diaphragm walls |
| Geographic Terms: |
Shanghai (China) |
| Abstract: |
Deformation caused by supported excavation makes significant impact on foundation pit stability. Evaluation of potential plastic zone is crucial for early warning of foundation pit instability. To address the shortcomings of existing evaluation methods, a new identification method based on the ultra-weak fiber Bragg grating (UWFBG) technology was proposed. To validate this approach, a UWFBG monitoring program was implemented in the boreholes as part of the Shanghai Metro Line 18 project. The monitoring results were utilized to determine the range of plastic zone for each borehole. It was noted that there are two plastic deformation zones formed with different mechanisms, one located near the base of the diaphragm wall (DW) and the other is distributed within the range of 6–19 m below the excavation face. Lastly, a criterion of early warning of foundation pit instability was presented. By analyzing the monitoring data, the highest risk level of this project was determined as "Attention", implying the necessity of taking measures to prevent the local plastic zone from evolving into a full-scale sliding surface. • The identification method of soil plastic zone based on UWFBG was proposed. • Three monitoring boreholes using the UWFBG cable were established • Plastic zone caused by supported excavation was successfully identified • A criterion for early warning of foundation pit instability was proposed [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
