What is this?.

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Presentation transcript:

What is this?

B6 580 Tonne Tunnelling Machine Money from sale went to charity Tony Wilkinson (scrap metal dealer) £39,999 (Stedman) £250,000 removal £39,899

Key Question: Why are tunnels and cuttings subject to landslides? Click on photo for video Key Words: Overbreak Ground squeezing Rock bursting Slip planes

Reasons why tunnels are prone to collapse Overburden Pressure Pressure from rock above Rockfall Overbreak Rock Bursting Groundwater inflow Ground Squeezing

Tunnel Problems: Key Definitions When too much material is extracted from a tunnel and it may collapse e.g. when blasting granite Over break When the sides of the tunnel collapse inwards due to the surrounding pressure Rock Bursting Budging upwards of the tunnel floor due to pressure Ground Squeezing Water entering the tunnel due to permeable rock (limestone / sandstone) and structures such as faults and joints. Groundwater Inflow Rock Fall When rocks fall in from above