Forepoling Design in Weak Medium based on the Convergence-Confinement Method
Publish place: کنفرانس بین المللی مهندسی عمران
Publish Year: 1395
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
CCIVIL01_099
تاریخ نمایه سازی: 21 شهریور 1395
Abstract:
Umbrella arches are tunnel heading reinforcements used for supporting the unlined portion of the tunnel heading when excavating a tunnel in soft ground or loose soil conditions by open face excavation methods. They are installed at the tunnel face at the top perimeter of the tunnel section. In this paper, the contribution of Convergence–Confinement method for tunneling design, forepoling technique, and Ring-Cut method considered for Gilavand tunnel. Three analysis are considered: top and bench excavation, ring-cut excavation, and top and bench excavation with presence of forepoling condition. The results show that the pre-consolidation is need for top and bench excavation method, however, the settlement is happened by installing supporting systems adjacent tunnel face. The settlement also is occurred in Ring-cut method, however the tunnel is stable. The both stability and settlement is provided, so that supporting system is installed in the close distance of tunnel face
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Authors
Rouhollah Basirat
Iran Oston Consulting Engineers Company; Tarbiat Modares University, PhD Student
Rahim Hassani
Iran Oston Consulting Engineers Company, MSc in Rock Mechanics Engineering
Navid Mahmoodian
Iran Oston Consulting Engineers Company, Manager of Structural Engineering Department
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