Dynamic Distortion and Long-Term Settlement of Weathered Argillaceous Siltstone under Subway Tunnel Base in Nanchang, China
Publication: Journal of Performance of Constructed Facilities
Volume 35, Issue 6
Abstract
Subway tunnels in Nanchang, China, may pass through one or several weathered argillaceous siltstones in the construction process. To reveal the influence of weathered argillaceous siltstone on the long-term settlement of subway tunnels, dynamic triaxial tests of intensely and moderately weathered argillaceous siltstone were carried out. Based on these tests results, the evolution law of cumulative plastic dynamic strain was analyzed and a prediction model of cumulative plastic strain was established. Finally, an actual subway tunnel with weathered argillaceous siltstone was selected for long-term settlement prediction analysis. The results of settlement prediction indicate that the sedimentation value of this tunnel is approximately 20.87 mm under 100 years of operation (service life). Research results show that the dynamic strain of weathered argillaceous siltstone under cyclic vibration load is mainly affected by dynamic stress and static deviatoric stress. When the static deviatoric stress increased from 0 to 200 kPa, the dynamic strain of intensely and moderately weathered argillaceous siltstone increased by 8.53 and 5.97 times, respectively. Therefore, the intensely weathered argillaceous siltstone (IWAS) is more susceptible to static deviatoric stress than moderately weathered argillaceous siltstone (MWAS). In addition, increasing the confining pressure will accelerate the expansion of fissures in intensely weathered argillaceous siltstone, while the fissures in moderately weathered argillaceous siltstone will be inhibited, and the effect is completely opposite.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors wish to acknowledge the financial supports from the Natural Science Foundation of Jiangxi Province (Grant No. 20192BAB206043), the Key Science and Technology Research Project in Jiangxi Province Department of Education (Grant No. GJJ200634), the Key Engineering Science and Technology Project of Jiangxi Provincial Department of Transportation (Grant Nos. 2019C0010 and 2019C0011), and the National Natural Science Foundation of China (Grant No. 51768020).
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Published In
Journal of Performance of Constructed Facilities
Volume 35 • Issue 6 • December 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jan 7, 2021
Accepted: Jul 26, 2021
Published online: Sep 6, 2021
Published in print: Dec 1, 2021
Discussion open until: Feb 6, 2022
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