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Abstract: Spray applied waterproof membranes allow composite action between the concrete and the membrane in a tunnel lining. This paper proposes a design chart for the determination of the secondary lining thickness that will allow designers to reduce the lining thickness when composite action is considered. This paper also presents potential savings in materials and carbon footprint in a quantified...
Abstract: The London tunnelling sector has been very active in recent years with many tunnels constructed using Sprayed Concrete Linings (SCL), often incorporating a sprayed waterproofing system between the primary and secondary linings. This paper discusses the use of a sprayed waterproofing membrane in tunnels constructed using the SCL method at the Bond Street...
Abstract: Compression core tests and flexural beam tests have been carried out using sprayed waterproof membrane sandwiched samples to obtain shear strength parameters at the sprayed waterproof membrane interface. These are inputted into LS-DYNA software to model realistic load sharing behaviour of a composite lining structure. This paper presents the findings and observations in load sharing between the...
Abstract: The Sparvo tunnel is part of “Variante di Valico” highway project, between Bologna and Florence in Italy. This contract was acquired by TOTO Costruzioni Generali S.p.A for 190 Mio€. Here a mechanized method was applied by using the world’s largest TBM called “Martina”, with an exceptional diameter of 15.62 m. BASF contributed to the successful TBM tunneling at Galleria Sparvo by supplying...