Influence of Marine Environment on Mechanical Properties of Grout-Reinforced Body

The laboratory test and numerical calculation were carried to explore the durability and service life of the grout-reinforced geological foundation. In this paper, the simulation test for determining penetration properties of grouting was carried out with the self-designed experimental device, and the mechanical properties and permeability coefficient were obtained. The results show that the seawater ions corroded the grout-reinforced body, and the properties had deteriorated. Meanwhile, the service life cycle prediction model was obtained according to the weakening of the deformation modulus. The calculated results demonstrate that the grout-reinforced body will fail in 29-63 years, which was far less than the concrete service life (100-120 years). In addition, the compressive strength obtained after the end of the service life was obtained as 9-27 MPa, less than the concrete strength at the same curing age. In conclusion, the failure of marine engineering is not only caused by concrete but more by the failure of the weak geological foundation strengthened by the grouting reinforcement.