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The purpose of this paper is to investigate the reinforcing effect of the fiber-reinforced plastic (FRP)-polymer shotcrete mortar (PCM) technique on degraded tunnel lining based on the finite difference method. One adverse condition that cavities exist between the lining and rock masses was concerned, and another adverse condition was considered, namely, that due to the existence of the cavity, the rock mass located above the cavity underwent large deformation that may have exerted excessive pressure on the lining. This pressure was defined as loosening pressure; In addition, the degree of deterioration was defined to represent the degraded level of the lining concrete compared to the original strength of the concrete. The limit state design method of the Moment-Axial force (M-N) performance curve was proposed to determine whether the structure is in a safe state. The results show that when the lining deterioration degree is 0% and 50%, the location of (M, N) is all distributed inside the corresponding M-N performance curves, which indicates that the reinforcing measures can meet the safety requirement, while when the lining deterioration degree is 80%, ten sets of cases (four cases for ground class DI and six cases for ground class DII) where the M-N values of several strengthening measures distributed outside the corresponding M-N performance curves were summarized, and these cases should be avoided in the corresponding engineering. The results of this investigation can provide a valuable reference for study on the reinforcing behavior with the FRP-PCM technique.

Study on Design of Tunnel Lining Reinforced by Combination of PCM Shotcrete and FRP Grid Technique