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- W584100946 abstract "The author suggests that advances in lining design are proceeding as quickly as those on tunnelling machinery. Groundwater infiltration is a perennial problem and geotextile manufacturers have been experimenting with materials to provide a drainage layer behind the waterproof liner. The use of geospacers is described, bulky structures with high discharge capacity, low liability to clogging and good protection against puncturing of the liner. Details are given of how enkadrain, a geospacer consisting of thermally bound synthetic filaments, is being used on parts of the channel tunnel. Tunnels lined with pre-cast concrete segments present a logistical problem of delivery to the working face and the possibility of grout going off. Details are given of the continental practice, now gaining popularity, of using concreting trains carrying aggregate, weighing and mixing units and additives to carry out mixing near the face. Details of the more sophisticated use of additives are given. The new Austrian tunnelling method and the use of robot guniting systems such as robojet are outlined. The relative merits of the use of wet or dry Gunite are discussed." @default.
- W584100946 created "2016-06-24" @default.
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- W584100946 date "1989-05-01" @default.
- W584100946 modified "2023-09-24" @default.
- W584100946 title "LINING UP HIGH SPEED OPTIONS" @default.
- W584100946 hasPublicationYear "1989" @default.
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