Numerical Method for the Deformation Calculation of the Shallow Buried Tunnel Caused by the Excavation of Overlying Soil Based on Soil Rebounding Characteristics
In view of strict deformation control standards, it is important to calculate the shallow tunnel deformation caused by the unloading of overburdened soil for analyzing tunnel structure safety. Due to the obvious nonlinear characteristics and the significantly smaller rebound deformation of soil unde...
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Frontiers Media S.A.
2022-07-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.872040/full |
| _version_ | 1811287868649242624 |
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| author | Jian Li Shichang Li Shichang Li Yu Zhang Shanxiong Chen Fei Yu Zhangjun Dai Chaoxiong Li |
| author_facet | Jian Li Shichang Li Shichang Li Yu Zhang Shanxiong Chen Fei Yu Zhangjun Dai Chaoxiong Li |
| author_sort | Jian Li |
| collection | DOAJ |
| description | In view of strict deformation control standards, it is important to calculate the shallow tunnel deformation caused by the unloading of overburdened soil for analyzing tunnel structure safety. Due to the obvious nonlinear characteristics and the significantly smaller rebound deformation of soil under unloading conditions, previous numerical calculation methods need to be improved and adapted to the soil deformation characteristics under unloading. Based on the above background, cyclic loading and unloading tests were carried out to study the deformation characteristics of soil under different loading levels, stress history, and unloading levels. Secondly, a unified modulus calculation model was established, especially for the unloading modulus, which considers the unloading stress history and current unloading stress level, and can provide the value of soil modulus in different states. The relationship between the unloading rebound modulus Esc and the rebound modulus Ec0 used in the numerical simulation was studied. Finally, a set of numerical calculation and analysis methods for shallow tunnel deformation caused by overlying soil excavation based on its rebounding characteristics is proposed. The rationality of the method is verified by two examples, and is applied to a practical project. |
| first_indexed | 2024-04-13T03:25:59Z |
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| id | doaj.art-2d94e2c5e9354230b19eee43a2838c22 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-13T03:25:59Z |
| publishDate | 2022-07-01 |
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| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-2d94e2c5e9354230b19eee43a2838c222022-12-22T03:04:39ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-07-011010.3389/feart.2022.872040872040Numerical Method for the Deformation Calculation of the Shallow Buried Tunnel Caused by the Excavation of Overlying Soil Based on Soil Rebounding CharacteristicsJian Li0Shichang Li1Shichang Li2Yu Zhang3Shanxiong Chen4Fei Yu5Zhangjun Dai6Chaoxiong Li7State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics (CAS), Wuhan, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics (CAS), Wuhan, ChinaUniversity of Chinese Academy of Sciences, Beijing, ChinaSichuan Water Develeopment Group Co., Ltd., Chengdu, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics (CAS), Wuhan, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics (CAS), Wuhan, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics (CAS), Wuhan, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics (CAS), Wuhan, ChinaIn view of strict deformation control standards, it is important to calculate the shallow tunnel deformation caused by the unloading of overburdened soil for analyzing tunnel structure safety. Due to the obvious nonlinear characteristics and the significantly smaller rebound deformation of soil under unloading conditions, previous numerical calculation methods need to be improved and adapted to the soil deformation characteristics under unloading. Based on the above background, cyclic loading and unloading tests were carried out to study the deformation characteristics of soil under different loading levels, stress history, and unloading levels. Secondly, a unified modulus calculation model was established, especially for the unloading modulus, which considers the unloading stress history and current unloading stress level, and can provide the value of soil modulus in different states. The relationship between the unloading rebound modulus Esc and the rebound modulus Ec0 used in the numerical simulation was studied. Finally, a set of numerical calculation and analysis methods for shallow tunnel deformation caused by overlying soil excavation based on its rebounding characteristics is proposed. The rationality of the method is verified by two examples, and is applied to a practical project.https://www.frontiersin.org/articles/10.3389/feart.2022.872040/fullsoil rebounding characteristicssoil unloaded constructionshallow buried tunnelnumerical simulation methoddeformation calculation |
| spellingShingle | Jian Li Shichang Li Shichang Li Yu Zhang Shanxiong Chen Fei Yu Zhangjun Dai Chaoxiong Li Numerical Method for the Deformation Calculation of the Shallow Buried Tunnel Caused by the Excavation of Overlying Soil Based on Soil Rebounding Characteristics Frontiers in Earth Science soil rebounding characteristics soil unloaded construction shallow buried tunnel numerical simulation method deformation calculation |
| title | Numerical Method for the Deformation Calculation of the Shallow Buried Tunnel Caused by the Excavation of Overlying Soil Based on Soil Rebounding Characteristics |
| title_full | Numerical Method for the Deformation Calculation of the Shallow Buried Tunnel Caused by the Excavation of Overlying Soil Based on Soil Rebounding Characteristics |
| title_fullStr | Numerical Method for the Deformation Calculation of the Shallow Buried Tunnel Caused by the Excavation of Overlying Soil Based on Soil Rebounding Characteristics |
| title_full_unstemmed | Numerical Method for the Deformation Calculation of the Shallow Buried Tunnel Caused by the Excavation of Overlying Soil Based on Soil Rebounding Characteristics |
| title_short | Numerical Method for the Deformation Calculation of the Shallow Buried Tunnel Caused by the Excavation of Overlying Soil Based on Soil Rebounding Characteristics |
| title_sort | numerical method for the deformation calculation of the shallow buried tunnel caused by the excavation of overlying soil based on soil rebounding characteristics |
| topic | soil rebounding characteristics soil unloaded construction shallow buried tunnel numerical simulation method deformation calculation |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.872040/full |
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