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Vibration Problems during Tunnelling in Rock
Construction Problems in Malaprabha Tunnel
Seismic and Nuclear Logging of Boreholes for Studying
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adit Balimela head race basalts Beas Sutlej Link beds biotite bore hole breccia cavity charnockite claystone closure collapse concrete lining construction crown Darjeeling district diameter distance dyke elasticity Engineering Geology excavation existing tunnel explosions fault flow fold foliation forepoles Geological Survey geophones gm/cc gneisses gneissic granite ground grouting head race tunnel horizontal hydel installed Jaldhaka joints Koyna located m/sec major Malabar Hill maximum method metres muck nala observed overbreak particle displacement particle velocity pattern phyllites portal portion pressure problems quartzites reach ribs rock cover rock formations rock loads rock mass rock types roof schist seepage seismic shear zones shotcrete siltstone slates spacing steel supports strata structure surface surge shaft Survey of India Sutlej Sutlej Link Project tail race tunnel technique terrace deposits thickness thrust tunnel alignment tunnel length tunnelling condition underground power house upto vertical vibrations Young's Modulus