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| Experimental study on dynamic compressive properties of composite layers of rock and steel fiber reinforced concrete#br# |
| CHEN Meng1，2，WANG Hao2，QI Mai1，LI Yi1，WANG Shuhong1，WANG Erlei3 |
(1. School of Resources and Civil Engineering，Northeastern University，Shenyang，Liaoning 110819，China；2. Science and Technology Innovation Center of Smart Water and Resource Environment，Northeastern University，Shenyang，Liaoning 110819，China；3. Design and Research Institute of Wuhan University of Technology，Wuhan，Hubei 430070，China)
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Abstract In order to study dynamic compressive properties of composite layers of rock and steel fiber reinforced concrete(SFRC) under impact load, dynamic compressive experiments of rock，SFRC and rock-SFRC composite layer were conducted using split Hopkinson pressure bar with six strain rates，and dynamic compressive strengths of specimens were compared with their static compressive strengths. The results show that SFRC enhances the static and dynamic compressive strengths of the composite layer. The dynamic compressive strength，energy absorption and dynamic strength increase factor(DIF) of rock-SFRC composite layers were sensitive to the strain rate. The dynamic compressive strength and dissipated energy of composite layers increase with increasing steel fiber content at a similar strain rate. With steel fiber content of 80 kg/m3，the dynamic compressive strength and dissipated energy of the composite layers respectively show a maximum increase by 30.1% and 53.9% compared with those without steel fiber. Steel fiber within content of 60 kg/m3 can effectively enhance DIF. With increasing the strain rate，the damage modes of composite layer specimens are divided into four types Including peripheral tensile strain failure of the concrete layer，crack penetrating the composite layer，core-retaining and overall fragment. The dynamic mechanical properties of rock-SFRC composite layers can provide a basis for the study on the mechanical mechanisms of supporting structure under impact loads.
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2020, Vol. 39 
