Field monitoring of vibration characteristics during advanced ductule installation in sandy cobble stratum
The sandy cobble stratum presents a high risk for underground tunnel construction due to its low cohesive properties and susceptibility to loosening and falling. The use of Advanced ductule for grouting reinforcement inevitably results in vibrations, and understanding how these vibrations propagate...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-10-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2023.1270971/full |
| _version_ | 1797657495756341248 |
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| author | Jiawei Kang Guohua Deng Guohua Deng Kai Zhang Shengjun Shao |
| author_facet | Jiawei Kang Guohua Deng Guohua Deng Kai Zhang Shengjun Shao |
| author_sort | Jiawei Kang |
| collection | DOAJ |
| description | The sandy cobble stratum presents a high risk for underground tunnel construction due to its low cohesive properties and susceptibility to loosening and falling. The use of Advanced ductule for grouting reinforcement inevitably results in vibrations, and understanding how these vibrations propagate is crucial in selecting tunnel engineering support schemes and responding to accident risks. Based on a bored tunnel under construction in Xi’an, field vibration propagation characteristics testing were carried out for advanced ductile installation. The time-history response and frequency distribution characteristics of the vibration velocity within the tunnel face under sandy cobble stratum conditions were studied, and the law of vibration propagation attenuation within the tunnel face range was obtained. The results showed that: 1) During the conduit drilling process, the tunnel face mainly experienced vertical vibrations, with the horizontal velocity amplitude accounting for only 15%–20% of the vertical velocity amplitude. At a distance of 1.0 m from the conduit, the vertical velocity amplitude reaches 10.602 mm/s, and the vibration energy concentrates mainly in the frequency range of 150–250 Hz. At a distance of 1.5 m from the conduit, the bidirectional vibration velocity significantly attenuates; 2) The vibration characteristics within the tunnel face can be classified into three primary areas: “Loose and Falling” area, “Significant Vibration” area, and “Vibration Attenuation” area. Loose, falling and significant vibrations occurred mainly within a range of about 1.25 m around the conduit. 3) As the diameter of the conduit decreases, the amplitude of vertical vibration velocity decreases by about 20%. By reducing the design diameter of the advanced ductule in a reasonable manner, it is possible to effectively mitigate the impact of vibration caused by the sandy cobble stratum during installation. This can yield a positive impact, curtailing the occurrence of the tunnel’s collapse phenomenon and ensuring its stability. |
| first_indexed | 2024-03-11T17:45:20Z |
| format | Article |
| id | doaj.art-e7f2ba2e342842abbd3044ca4830300c |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-03-11T17:45:20Z |
| publishDate | 2023-10-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-e7f2ba2e342842abbd3044ca4830300c2023-10-18T08:22:15ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-10-011110.3389/feart.2023.12709711270971Field monitoring of vibration characteristics during advanced ductule installation in sandy cobble stratumJiawei Kang0Guohua Deng1Guohua Deng2Kai Zhang3Shengjun Shao4Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an, ChinaInstitute of Geotechnical Engineering, Xi’an University of Technology, Xi’an, ChinaXi’an Loess Underground Project Technology Consulting Co., Ltd., Xi’an, ChinaChina Jikan Research Institute of Engineering Investigations and Design, Co., Ltd., Xi’an, ChinaInstitute of Geotechnical Engineering, Xi’an University of Technology, Xi’an, ChinaThe sandy cobble stratum presents a high risk for underground tunnel construction due to its low cohesive properties and susceptibility to loosening and falling. The use of Advanced ductule for grouting reinforcement inevitably results in vibrations, and understanding how these vibrations propagate is crucial in selecting tunnel engineering support schemes and responding to accident risks. Based on a bored tunnel under construction in Xi’an, field vibration propagation characteristics testing were carried out for advanced ductile installation. The time-history response and frequency distribution characteristics of the vibration velocity within the tunnel face under sandy cobble stratum conditions were studied, and the law of vibration propagation attenuation within the tunnel face range was obtained. The results showed that: 1) During the conduit drilling process, the tunnel face mainly experienced vertical vibrations, with the horizontal velocity amplitude accounting for only 15%–20% of the vertical velocity amplitude. At a distance of 1.0 m from the conduit, the vertical velocity amplitude reaches 10.602 mm/s, and the vibration energy concentrates mainly in the frequency range of 150–250 Hz. At a distance of 1.5 m from the conduit, the bidirectional vibration velocity significantly attenuates; 2) The vibration characteristics within the tunnel face can be classified into three primary areas: “Loose and Falling” area, “Significant Vibration” area, and “Vibration Attenuation” area. Loose, falling and significant vibrations occurred mainly within a range of about 1.25 m around the conduit. 3) As the diameter of the conduit decreases, the amplitude of vertical vibration velocity decreases by about 20%. By reducing the design diameter of the advanced ductule in a reasonable manner, it is possible to effectively mitigate the impact of vibration caused by the sandy cobble stratum during installation. This can yield a positive impact, curtailing the occurrence of the tunnel’s collapse phenomenon and ensuring its stability.https://www.frontiersin.org/articles/10.3389/feart.2023.1270971/fullbored tunnelsandy cobble stratumadvance conduitvibration attenuation characteristicsvibration velocity amplitude |
| spellingShingle | Jiawei Kang Guohua Deng Guohua Deng Kai Zhang Shengjun Shao Field monitoring of vibration characteristics during advanced ductule installation in sandy cobble stratum Frontiers in Earth Science bored tunnel sandy cobble stratum advance conduit vibration attenuation characteristics vibration velocity amplitude |
| title | Field monitoring of vibration characteristics during advanced ductule installation in sandy cobble stratum |
| title_full | Field monitoring of vibration characteristics during advanced ductule installation in sandy cobble stratum |
| title_fullStr | Field monitoring of vibration characteristics during advanced ductule installation in sandy cobble stratum |
| title_full_unstemmed | Field monitoring of vibration characteristics during advanced ductule installation in sandy cobble stratum |
| title_short | Field monitoring of vibration characteristics during advanced ductule installation in sandy cobble stratum |
| title_sort | field monitoring of vibration characteristics during advanced ductule installation in sandy cobble stratum |
| topic | bored tunnel sandy cobble stratum advance conduit vibration attenuation characteristics vibration velocity amplitude |
| url | https://www.frontiersin.org/articles/10.3389/feart.2023.1270971/full |
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