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A platform for research: civil engineering, architecture and urbanism
The Research of Dynamics Property and Long-Term Settlement About Weathered Argillaceous Siltstone Under Base of Subway Tunnel
Subway tunnel of Nanchang may pass through one or several weathered argillaceous siltstone in the construction process. To reveal the influence of weathered argillaceous siltstone on the long-term settlement of subway tunnel, the 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 prediction data shows that the sedimentation value of tunnel is approximately 20.87 mm under 100 years operation. Research results indicate 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 kPa to 200 kPa, the dynamic strain of intensely and moderately weathered argillaceous siltstone increased by 8.53 times 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, which show diametrically opposite results.
The Research of Dynamics Property and Long-Term Settlement About Weathered Argillaceous Siltstone Under Base of Subway Tunnel
Subway tunnel of Nanchang may pass through one or several weathered argillaceous siltstone in the construction process. To reveal the influence of weathered argillaceous siltstone on the long-term settlement of subway tunnel, the 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 prediction data shows that the sedimentation value of tunnel is approximately 20.87 mm under 100 years operation. Research results indicate 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 kPa to 200 kPa, the dynamic strain of intensely and moderately weathered argillaceous siltstone increased by 8.53 times 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, which show diametrically opposite results.
The Research of Dynamics Property and Long-Term Settlement About Weathered Argillaceous Siltstone Under Base of Subway Tunnel
Sustain. Civil Infrastruct.
Liu, Yong (editor) / Cuomo, Sabatino (editor) / Yang, Junsheng (editor) / Shi, Yu-Feng (author) / Yu, Chao (author) / Chen, Xiang-Sheng (author) / Zhao, Xiu-Shao (author) / Zhu, Bi-Tang (author)
Civil Infrastructures Confronting Severe Weathers and Climate Changes Conference ; 2021 ; NanChang, China
2021-07-24
13 pages
Article/Chapter (Book)
Electronic Resource
English
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