Research on the Crack Resistance and Bearing Capacity of Concrete Roadway Enhanced by Carbon Fiber Mesh and Carbon Fiber Short Cut Wire

Abstract

Shotcrete support technology can play a certain role in strengthening and anti-permeability of underground roadway. However, the lack of crack resistance and bending resistance seriously affects the function of shotcrete support. In this paper, the crack resistance and bearing capacity of underground concrete shotcrete layer were improved by means of high density carbon fiber mesh (CFM) embedded in prefabricated layer and carbon fiber short cut wires (CFSC) with different content of uniform cloth, which was focused on the synergistic strengthening mechanism between CFM and CFSC. The results show that the addition of high density CFM can significantly improve the bearing capacity of concrete shotcrete layer, but the improvement of crack resistance is not obvious. The addition of CFSC (with a content of 2% and a length of 3 mm) can significantly increase the initial crack load of concrete shotcrete, thus improving the crack resistance performance, but it has no obvious effect on the bearing capacity. Adding CFM and CFSC together can further significantly enhance the bearing capacity and crack resistance of concrete shotcrete layer and give full play to the synergistic enhancement effect between the two.