Three-Dimensional Limit Equilibrium Solution of Minimum Support Pressure of Shield Tunnel Face in Sandy Cobble Stratum
| العنوان: | Three-Dimensional Limit Equilibrium Solution of Minimum Support Pressure of Shield Tunnel Face in Sandy Cobble Stratum |
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| المؤلفون: | Zhang Junwei, Wan Panpan, Huang Xinmiao |
| المصدر: | Arabian Journal for Science and Engineering. 46:5061-5069 |
| بيانات النشر: | Springer Science and Business Media LLC, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Multidisciplinary, business.product_category, Computer simulation, Cobble, 010102 general mathematics, 01 natural sciences, Instability, Wedge (mechanical device), Shield, Geotechnical engineering, Limit (mathematics), 0101 mathematics, business, Geology, Line (formation), Stratum |
| الوصف: | The ground subsidence accident caused by the instability of shield tunnel face has been a major problem that puzzles urban subway construction in weak rock. Maintaining the stability of tunnel face is the key to ensure the safety of shield construction and reduce the environmental impact. In view of the shield with a diameter of 8600 mm in Chengdu metro line 18 through the sandy cobble stratum, it is more difficult to maintain the stability of the shield tunnel face than other strata. The characteristics of the sandy pebble stratum were taken into account firstly in this paper. The analytical equation was obtained by the limit equilibrium method. The optimization of the trapezoidal bottom has been improved based on the existing 3D trapezoidal wedge model. And the optimal solution of the ultimate support pressure was obtained. The influencing factors of support pressure are also analysed. When the tunnel diameter is fixed, the deeper the ground covering depth is, the greater the required limit support pressure becomes. But the ground covering depth has almost no effect on the ultimate support pressure even if the tunnel is deep. The limit support pressure is inversely proportional to the internal friction angle of the soil and is proportional to the diameter of the tunnel. Finally, theoretical limit support pressure can be also verified by the numerical simulation results and the field monitoring results. It provides a reference for the subsequent setting value of the soil warehouse pressure. |
| تدمد: | 2191-4281 2193-567X |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::4b8d531ad5c1bada275c2453a3d2738eTest https://doi.org/10.1007/s13369-020-05231-wTest |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi...........4b8d531ad5c1bada275c2453a3d2738e |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 21914281 2193567X |
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