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https://www.robbinstbm.com/wp-content/uploads/2010/04/22_EPBConveyors_WhitePapers.jpg9001200Soft ground, EPB TBM-driven tunnels provide a challenging environment for continuous conveyors due to the variety of materials present. The design of both horizontal and vertical soft ground conveyors will vary depending on the types of excavated material, amount of water present, and other factors.