New Approach in Tunneling Construction Using the Forepooling Technique
Publish place: 12th Iranian & 3rd Regional Tunnelling Conference
Publish Year: 1396
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ITC12_001
تاریخ نمایه سازی: 20 خرداد 1398
Abstract:
Austrian Tunneling is mainly applicable for big section tunnels. The tunnel is excavated step by step in thistechnique. Furthermore, forepoling, jet grouting and freezing are the techniques applied to construct falling tunnels;however, Austrian tunneling should not be used alone in medium section tunnels such as water conveyance tunneland falling tunnels. As a result, the authors have introduced a new technique called Right-Left technique. In thistechnique, first forepoling, also known as tube umbrella, was used to strengthen tunnel. Then, having divided tunnelinto two left and right sections, the right section was excavated exactly the size of half a steel frame and shotcretetechnique was immediately used. The same technique was applied to the left section. Then, the face was advanced bydrum cutter up to the area excavated by steel frame. The operation cycle was completed in this way. Relative stabilitywas obtained by using this technique. In this paper, technical reasons for choosing this technique was presented.Furthermore, using Flac 3D, its convergence was compared with that of the Austrian.
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Authors
Masoud Ghaemi
phD Candidate in Rock Mechanic, Engineer Sepasad Group, Coach of Shams University,
Alireza Khalili
Student of Geotechnic, Shams Higher Education Institute, Gonbad-e Kavus
Majid Matloobi
Engineer Sepasad Group
Ahmad Faramarzi
Engineer Sepasad Group