engleski

Use of High Perfomance Fibre-Reinforced Concrete to Stabilize Underground Openings

Development of novel building materials based on a cement binder, and improvement of the properties of existing made considerable progress at the end of last century and at the beginning of this century. One of innovative types of concrete that occurred in this period is a high-performance fibre-reinforced concrete type (HPFRC). To the present day a small number of structures made of HPFRC were constructed. Tunnelling is one of few fields of civil engineering in which application of HPFRC has not been closely investigated so far. In this paper are presented the results of testing HPFRC, steel fibre-reinforced concrete (SFRC, C 130) and plain concrete (C 30) designed for fabrication of elements to be used for secondary tunnel lining. Experimentally obtained values of mechanical properties of the said concrete types were used in modelling the behaviour of secondary tunnel lining. In numerical analyses, the parameters that were varied were the following: the type and cross-section of concrete in secondary tunnel lining and the type of loading. The analyses carried out showed that HPFRC used for fabrication of secondary tunnel lining has higher bearing capacity and safety than other concrete types.

fibre-reinroced concrete; undergound openings; monitoring

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