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Research Article
Jie Zhou
Tongji University
Corresponding Author
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The acceleration and deceleration movement of the subway near the subway station have a certain impact on the foundation soil. After the samples have been reconstituted in an inclined slope using sand rain method, undrained dynamic cyclic triaxial experiments were designed under specific variable frequency loading condition according to on-site monitoring data and theoretical calculation results. Effects of subway entrance/exit distance, subway entrance/exit acceleration, vibration amplitude, effective confining pressure on the cumulative deformation characteristics of Nanjing saturated silty sand were explored under experimental program. The results show that the cumulative plastic strain development of the Nanjing silty sand under the variable frequency cyclic loading of subway entrance/ exit can be roughly divided into three stages: explosive growth, rapid growth and gradual stability. The increase of the distance from the subway station can reduce the vibration cycles of subway entrance/exit loading to enter the gradual stabilization phase; it can also lower the shear deformation and increase the vertical deformation. Greater the vibration amplitude or lower the effective confining pressure can also have the same effect on soil deformation characteristics. Instead, greater the subway entrance/ exit acceleration, smaller the vertical deformation and larger the shear deformation. For practical engineering, the initial stage of subway line in operation is the focus of engineering geological disaster prevention. The settlement deformation of the soil in subway entrance interval, the horizontal displacement of the soil in subway exit interval are more serious. The soil closer to subway station is more prone to deformation hazard
Keywords
variable frequency cyclic loading, subway entrance/exit acceleration, cumulative deformation, undrained dynamic triaxial test
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This preprint is under consideration at Environmental Earth Sciences. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Jie Zhou
Tongji University
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 15 Mar, 2021
No community comments so far
Review #? received
Received 12 Mar, 2021
Reviewers invited
Invitations sent on 12 Mar, 2021
First submitted
On 25 Jan, 2021
License:
This work is licensed under a CC BY 4.0 License. Read Full License
The acceleration and deceleration movement of the subway near the subway station have a certain impact on the foundation soil. After the samples have been reconstituted in an inclined slope using sand rain method, undrained dynamic cyclic triaxial experiments were designed under specific variable frequency loading condition according to on-site monitoring data and theoretical calculation results. Effects of subway entrance/exit distance, subway entrance/exit acceleration, vibration amplitude, effective confining pressure on the cumulative deformation characteristics of Nanjing saturated silty sand were explored under experimental program. The results show that the cumulative plastic strain development of the Nanjing silty sand under the variable frequency cyclic loading of subway entrance/ exit can be roughly divided into three stages: explosive growth, rapid growth and gradual stability. The increase of the distance from the subway station can reduce the vibration cycles of subway entrance/exit loading to enter the gradual stabilization phase; it can also lower the shear deformation and increase the vertical deformation. Greater the vibration amplitude or lower the effective confining pressure can also have the same effect on soil deformation characteristics. Instead, greater the subway entrance/ exit acceleration, smaller the vertical deformation and larger the shear deformation. For practical engineering, the initial stage of subway line in operation is the focus of engineering geological disaster prevention. The settlement deformation of the soil in subway entrance interval, the horizontal displacement of the soil in subway exit interval are more serious. The soil closer to subway station is more prone to deformation hazard
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