Fibre-reinforced shotcrete (sprayed concrete) is one of the major components in support system for tunnels hard rock. Several empirical design methodologies have been developed over years due to complexity and many uncertainties involved rock design. Therefore, this paper aims highlight how choice methodology fibre type impacts structural capacity lining emission greenhouse gases (GHG). The sta...

To reveal the flow characteristics of shotcrete during pneumatic transportation, numerical simulation gas–solid in pipeline transportation process was carried out based on a CFD-DEM coupling method. When particle diameter increased from 7 mm to 12 mm, maximum wear depth 1.48 × 10−6 4.58 mm. With an increase diameter, increased. Moreover, position gradually concentrated fixed area with diameter....

The global demand for mineral resources has led to the gradual transformation of mining industry from traditional shallow, small-scale mode high-intensity deep underground mines. Due high stress, temperature, permeability, and easy disturbance mines, new challenges have been brought materials. Some scholars improved thermal insulation performance concrete by adding low conductivity materials su...

Abstract The use of unlined/shotcrete lined pressure tunnels and shafts are cost-effective solutions for a hydropower project being implemented worldwide. To implement this concept, the ground conditions at area concern should be favorable regarding minimum principal stress magnitude, which higher than hydrostatic water head acting on tunnel periphery. In addition, rock mass relatively unjointe...