Experiment Study on Mechanical Properties of Shotcrete under heat Injury Environment of High Ground Temperature Tunnel

摘要

With the tunnel growing more long and deep, heat injury problems have become increasingly prominent. In order to analyze how would the environment of high ground temperature impact on compressive strength of shotcrete, experiment was designed to explore the compressive strength of C25 shotcrete at 28d age by simulating environmental. The test results show that: water tank and the oven can more accurately simulate the natural hot-humid and hot-dry environment; Compared to the standard curing conditions, Whether in the hot-humid environment or hot-dry environment, the compressive strength of shotcrete is decreased. Mixed with 2% fly ash can improve the compressive strength of shotcrete in hot-humid environment.