Abstract
The intention of this paper is to reveal the mechanical properties of steel fiber reinforced concrete (SFRC) at different volume fractions of steel fiber and demonstrate that it can be applied as support in underground coal-mine tunnels. With the similar simulation tests and FLAC finite-element numerical simulation, semicircular concrete specimens at the steel-fiber volume fractions of 0, 0.5% and 1.0 % were investigated. In the similar simulation test, a few of strain gages were distributed in the semicircular-arch specimens to analyze specimens' breaking process, the trend of crack development and the relation of stress versus strain at the measured points at different volume fractions of steel fiber; With the FLAC finite-element numerical simulation, the maximal principal stress distribution of the concrete specimens at three volume fractions of steel fiber was simulated. The results from the numerical simulation and from the simulation test were consistent. Both shed light on the rules that specimen's load-bearing capacity increases with the increase in steel fiber's volume fraction and that its neutral axis moves up with increase of the load. The result will play an important role in cutting down cost in support work, making support work more effective and efficient and developing a sound theory for support design in the coal mines.
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