PowerPoint Presentation principles... · 2008-11-12 · excavation Shotcrete as soon as possible...
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Transcript of PowerPoint Presentation principles... · 2008-11-12 · excavation Shotcrete as soon as possible...
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Tunnel Excavation by Drilling and Blasting
• a. The excavation cycle. The typical cycle of excavation
• by blasting is performed in the following steps:
• (1) Drilling blast holes and loading them with explosives.
• (2) Detonating the blast, followed by ventilation to remove blast fumes.
• (3) Removal of the blasted rock (mucking).
• (4) Scaling crown and walls to remove loosened pieces of rock.
• (5) Installing initial ground support.• (6) Advancing rail, ventilation, and
utilities.
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Tunnel Excavation by Mechanical Means
•a. Roadheader excavation.
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d. TBM performance parameters.
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Tunneling Design According to Rock Quality
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SUPPORTING
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