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Barrow-upon-Soar Tunnels
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| Service: | Value engineering: NATM detailed design, FEM calculation and design of waterproofing system.
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| Estimated cost: | Commencement: | March 27, 1986
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Completion date: | December 27, 1988
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| Location: | Barrow upon Soar Leicestershire LE12 8GB |
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| Technical data: | 2 inclined transportation tunnels, length of 505 m (1656 ft) each. Under hydrostatic waterpressure, up to 55 psi for the first 300 m (984 ft) of each drift. |
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| Geology description: | River and glacial deposits, Blue Lias, limestones, Rhaetic Mudstones, Tea Green Marl, Mercia Mudstone, Tutbury Gypsum. |
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| Bid cost: | Final cost: | £4 million GBP
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Description
British Gypsum's operation at Leicestershire, a plaster production plant, improved infrastructure by establishing 2 new tunnels on site. Ground treatment for the control of water ingress during construction, drift excavation, final lining and a water ingress guarantee had to be taken into consideration. By applying NATM, the tunnel was excavated by roadheader and supported with lattice girders followed by shotcrete. The construction met the final water ingress guarantee by installing a PVC waterproofing membrane between the primary shotcrete lining and the final unreinforced in-situ concrete lining which is of a watertight quality in the invert.
