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The first aspect of tunneling is to drill a sewer. The cutter head is filled with a slurry (suspension of Bentonite/clay and water) which applies hydrostatic pressure on the excavation face.
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The first aspect of tunneling is to drill a sewer. The cutter head is filled with a slurry (suspension of Bentonite/clay and water) which applies hydrostatic pressure on the excavation face.
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