Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation
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...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/170657 |
| _version_ | 1811685915964211200 |
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| author | Han, Heming Shi, Bin Yang, Yaowen Zhang, Cheng-Cheng Zhang, Lei Wei, Guangqing |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Han, Heming Shi, Bin Yang, Yaowen Zhang, Cheng-Cheng Zhang, Lei Wei, Guangqing |
| author_sort | Han, Heming |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T04:52:07Z |
| format | Journal Article |
| id | ntu-10356/170657 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:52:07Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1706572023-09-25T04:59:07Z Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation Han, Heming Shi, Bin Yang, Yaowen Zhang, Cheng-Cheng Zhang, Lei Wei, Guangqing School of Civil and Environmental Engineering Engineering::Civil engineering Ultra-Weak FBG Plastic Zone 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 authors gratefully acknowledge the financial supports provided by the National Natural Science Foundation of China (Grant 42030701) and the China Scholarship Council (Grant number 202106190132). 2023-09-25T04:59:07Z 2023-09-25T04:59:07Z 2023 Journal Article Han, H., Shi, B., Yang, Y., Zhang, C., Zhang, L. & Wei, G. (2023). Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation. Engineering Geology, 317, 107061-. https://dx.doi.org/10.1016/j.enggeo.2023.107061 0013-7952 https://hdl.handle.net/10356/170657 10.1016/j.enggeo.2023.107061 2-s2.0-85150298409 317 107061 en Engineering Geology © 2023 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Ultra-Weak FBG Plastic Zone Han, Heming Shi, Bin Yang, Yaowen Zhang, Cheng-Cheng Zhang, Lei Wei, Guangqing Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation |
| title | Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation |
| title_full | Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation |
| title_fullStr | Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation |
| title_full_unstemmed | Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation |
| title_short | Ultra-weak FBG sensing for identification and analysis of plastic zone of soil caused by supported excavation |
| title_sort | ultra weak fbg sensing for identification and analysis of plastic zone of soil caused by supported excavation |
| topic | Engineering::Civil engineering Ultra-Weak FBG Plastic Zone |
| url | https://hdl.handle.net/10356/170657 |
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