Large Scale Testing of Shotcrete

M?rch, Atle; ,

Large Scale Testing of Shotcrete

by Atle M?rch, Fundia Christiana Spigerverk AS, Oslo, Norway,

Document Type: Proceeding Paper

Part of: Shotcrete for Underground Support VI

Abstract:

A large scale test program was carried out to evaluate the relative roles of steel fiber and mesh reinforced shotcrete for hard rock stabilization. The most realistic conditions in a tunnel were simulated. The study was divided into three parts. The 'falling block' simulated mesh reinforced (MR) and steel fiber reinforced (SFR) shotcrete loaded by a large granite block between bolts in stable rock. The 'circular slab' showed the strength and crack distribution of SFR shotcrete around a single bolt. To simulate the strength of SFR shotcrete between two bolts, the 'one way slab' test was devised. In addition, a comprehensive bending test program was undertaken. The results showed the advantages of steel fiber reinforced shotcrete. They showed great toughness and good crack distribution for rock stabilization.

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