Application of Fiber Grating Sensing in Similar Model Impact Tests of Underground Engineering
To clarify damage or degradation mechanisms of underground shock disturbance of deep caverns, a customized model of a deep cavern to subjected ground shock was employed to simulate the following properties and processes: crustal stress loading, cavern excavation, and ground-shock disturbance loading...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2023-01-01
|
| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2023/8185870 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850178996768079872 |
|---|---|
| author | Lei Gao Zhihao Li Jie Li Zhen Wang Haiming Jiang Mingyang Wang |
| author_facet | Lei Gao Zhihao Li Jie Li Zhen Wang Haiming Jiang Mingyang Wang |
| author_sort | Lei Gao |
| collection | DOAJ |
| description | To clarify damage or degradation mechanisms of underground shock disturbance of deep caverns, a customized model of a deep cavern to subjected ground shock was employed to simulate the following properties and processes: crustal stress loading, cavern excavation, and ground-shock disturbance loading. The similar model specimen was a cube of 1.3 m length and a size similarity ratio of 1 : 50. A fiber Bragg grating (FBG) strain sensor with multipoint distributions was developed to monitor the distribution of internal strains in the model. Sensors were appropriately arranged and packaged in the similar model of deep rock to determine strain variation in the model under hydrostatic confining pressure, construction dynamic load, and shock dynamic load. This investigation involved high crustal stress simulation, tunnel boring machine (TBM) construction simulation, and deep explosive shock simulation, respectively. The results suggest that the sensors can accurately monitor the strain during the entire process comprising loading, excavation, and shock generation and obtain the distribution of cave strain during excavation and shock generation. The cave strain indicated that the left and right sides of the tunnel both experienced a rapid increase in tensile strain from the top plane shock wave, proportional to the shock force. The mechanism of surrounding rock failure and the occurrence of the V-shaped blasting pit were clarified. In the model test, the following phenomena related to deep tunnel failure were simulated: particle ejection, block collapse, slabbing, and tunnel face collapse. The oscillatory wave was also monitored with FBG sensors. The results demonstrated that FBG strain sensor had good repeatability and could accurately monitor strain change in the different blocks, thus demonstrating considerable potential for use in similar model tests. The model tests conducted in this study can provide important technical reference and support for the construction and protective design of deep caverns. |
| format | Article |
| id | doaj-art-bdd1a8ef8552429ebfd4e3530fb28ce2 |
| institution | OA Journals |
| issn | 1468-8123 |
| language | English |
| publishDate | 2023-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-bdd1a8ef8552429ebfd4e3530fb28ce22025-08-20T02:18:36ZengWileyGeofluids1468-81232023-01-01202310.1155/2023/8185870Application of Fiber Grating Sensing in Similar Model Impact Tests of Underground EngineeringLei Gao0Zhihao Li1Jie Li2Zhen Wang3Haiming Jiang4Mingyang Wang5College of Mechanical EngineeringState Key Laboratory of Explosion and Impact and Disaster Prevention and MitigationCollege of Mechanical EngineeringCollege of Mechanical EngineeringState Key Laboratory of Explosion and Impact and Disaster Prevention and MitigationCollege of Mechanical EngineeringTo clarify damage or degradation mechanisms of underground shock disturbance of deep caverns, a customized model of a deep cavern to subjected ground shock was employed to simulate the following properties and processes: crustal stress loading, cavern excavation, and ground-shock disturbance loading. The similar model specimen was a cube of 1.3 m length and a size similarity ratio of 1 : 50. A fiber Bragg grating (FBG) strain sensor with multipoint distributions was developed to monitor the distribution of internal strains in the model. Sensors were appropriately arranged and packaged in the similar model of deep rock to determine strain variation in the model under hydrostatic confining pressure, construction dynamic load, and shock dynamic load. This investigation involved high crustal stress simulation, tunnel boring machine (TBM) construction simulation, and deep explosive shock simulation, respectively. The results suggest that the sensors can accurately monitor the strain during the entire process comprising loading, excavation, and shock generation and obtain the distribution of cave strain during excavation and shock generation. The cave strain indicated that the left and right sides of the tunnel both experienced a rapid increase in tensile strain from the top plane shock wave, proportional to the shock force. The mechanism of surrounding rock failure and the occurrence of the V-shaped blasting pit were clarified. In the model test, the following phenomena related to deep tunnel failure were simulated: particle ejection, block collapse, slabbing, and tunnel face collapse. The oscillatory wave was also monitored with FBG sensors. The results demonstrated that FBG strain sensor had good repeatability and could accurately monitor strain change in the different blocks, thus demonstrating considerable potential for use in similar model tests. The model tests conducted in this study can provide important technical reference and support for the construction and protective design of deep caverns.http://dx.doi.org/10.1155/2023/8185870 |
| spellingShingle | Lei Gao Zhihao Li Jie Li Zhen Wang Haiming Jiang Mingyang Wang Application of Fiber Grating Sensing in Similar Model Impact Tests of Underground Engineering Geofluids |
| title | Application of Fiber Grating Sensing in Similar Model Impact Tests of Underground Engineering |
| title_full | Application of Fiber Grating Sensing in Similar Model Impact Tests of Underground Engineering |
| title_fullStr | Application of Fiber Grating Sensing in Similar Model Impact Tests of Underground Engineering |
| title_full_unstemmed | Application of Fiber Grating Sensing in Similar Model Impact Tests of Underground Engineering |
| title_short | Application of Fiber Grating Sensing in Similar Model Impact Tests of Underground Engineering |
| title_sort | application of fiber grating sensing in similar model impact tests of underground engineering |
| url | http://dx.doi.org/10.1155/2023/8185870 |
| work_keys_str_mv | AT leigao applicationoffibergratingsensinginsimilarmodelimpacttestsofundergroundengineering AT zhihaoli applicationoffibergratingsensinginsimilarmodelimpacttestsofundergroundengineering AT jieli applicationoffibergratingsensinginsimilarmodelimpacttestsofundergroundengineering AT zhenwang applicationoffibergratingsensinginsimilarmodelimpacttestsofundergroundengineering AT haimingjiang applicationoffibergratingsensinginsimilarmodelimpacttestsofundergroundengineering AT mingyangwang applicationoffibergratingsensinginsimilarmodelimpacttestsofundergroundengineering |