ПОВЕДЕНИЕ ТОННЕЛЯ, ВЫЗВАННОЕ ДЛИТЕЛЬНОЙ ОСАДКОЙ ГЛИНИСТОГО ГРУНТА Tunnel behaviour caused by ground surcharge in clay

Huasheng Sun, Jiahui Li, Yadong Chen

Аннотация


С развитием городской застройки в окрестности тоннелей метро неизбежно появляется дополнительные нагрузки и вызванные ими осадки грунта, что приводит к деформациям тоннеля. В случае глинистых грунтов важную роль играют их реологические свойства и механизмы развития длительных деформаций во времени. В работе, с использованием численного анализа, моделировались долговременная деформация и изменение напряжений в тоннеле, проложенном в глинистых отложениях. Показано, что эффекты консолидации могут существенно увеличивать осадку тоннеля по сравнению с первоначальной, возникающей сразу после дополнительной загрузки. С уменьшением давления поровой воды эффективная нагрузка на тоннель постепенно возрастала, что привело к увеличению его осадки
после 200 дней консолидации на 128% и сильно повлияло на деформацию поперечного сечения обделки. Полученные результаты могут послужить теоретической основой для прогнозирования и контроля деформаций тоннеля на глинистом основании в практическом проектировании.

Полный текст статьи публикуется в английской версии журнала
«Soil Mechanics and Foundation Engineering”, vol.62, No.5


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