ABSTRACT
Taking Caoguoshan tunnel as a research objective, the change law of macro mechanical properties of shotcrete with age was analyzed by field test, and the vibration law of shotcrete with distance of face was obtained by field monitoring under cyclic blasting load. The results show that the compressive strength of shotcrete prismatic body is 30.5% on 1d, 77.8% on 7d, and 94.5% on 14d, and the compressive strength of shotcrete increases significantly in the first 7 days. The elastic modulus of static compression in 1d is 36.6% of 28d. The elastic modulus of 7d is 59.3% of 28d. The elastic modulus of 14d was 78.2% of 28d. The vibration velocity of the shotcrete with increase in distance of the face is not strictly monotonous, but the general law is gradually reduced.
