Steel-Fibre Shotcrete

Determining equivalent tensile Strengths of Steel-Fibre Shotcrete

Through the application of steel-fibre shotcrete (SFRS) initial supporting in an unsecured area is possible in the case of many tunnel projects. Nowadays a permanent inner shell made of SFRS is being called for more and more frequently. Dimensioning takes place through determining the equivalent tensile strength as is explained in the following contribution.

For temporary (outer) tunnel shells the construction method using steel fibre shotcrete (SFRS) is state of the art and facilitates an initial support without undertaking work in the unsecured area.
Usually dimensioning is carried out without any formal static analysis of equivalence to conventional solutions (e.g. matting reinforcement) using a minimum amount of effort.
Increasingly however permanent inner shells are being produced at present in international tunnelling providing suitable geotechnical marginal conditions exist (e.g. low water pressures) made of SFRS [18] while renouncing...

Related articles:

Issue 2011-01

Introduction Upon the appearance of steel-fibre-reinforced concrete on the European market in the 1970s, neither standards nor guidelines for the design and dimensioning of this new material were...

more
Issue 2015-07 Brugg Contec

The durability of synthetic fibers in aggressive environments is often questioned. A long-term test undertaken by the Swiss material tes­ting and research institute (EMPA) as part of a KTI project...

more
Issue 2010-06

Shotcrete is a high-performance product, which is placed through spraying at high speed and compacted by the impact: By adding shotcrete accelerator (accelerator) at the nozzle the shotcrete sets...

more
Issue 2023-02

The tunnel boring technique poses significant demands on the stability of the tunnel tube, which depends on various factors including the time-dependent strength and stiffness development of the...

more

Shotcrete is a high-performance product, which is placed through spraying at high speed and compacted by the impact: By adding shotcrete accelerator (accelerator) at the nozzle the shotcrete sets...

more