Role of temperature effect on the strength deterioration of wet shotcrete in cold area construction

Abstract The safety of geotechnical engineering in cold region depends on the stability of supporting structure. Wet shotcrete technology (WST) has the advantages of less dust on the working surface, low rebound and high strength of shotcrete layer, so it has been gradually applied in roadway support of broken surrounding rock. In the cold environment, the decrease of the curing temperature of WST will have an impact on the development of shotcrete strength, but the influence of this temperature difference has not been fully considered in the current engineering practice. Aiming at the phenomenon of small thickness, low strength, and easy cracking of shotcrete in the application of WST in a mine in alpine environment, the temperature effect study on the strength evolution of WST was carried out. The research puts forward the optimization measures for WST support in the alpine environment, which effectively improves the structural strength of the shotcrete, the support repair rate is greatly reduced, and the support efficiency is significantly improved, it also provides reference for WST construction under similar engineering conditions.