Abstract Structural integrity assessment is essential in modern tunneling to ensure safe construction works. State-of-the-art monitoring approaches like displacement readings of geodetic prisms are often limited the spatial as well temporal measurement resolution, which why potential safety hazards might be overlooked. This paper introduces a large-scale distributed fiber optic sensing (DFOS) n...

Feet-lock steel pipes have been widely applied in soft-rock tunnels, but their installation quantity and parameters depend on engineering experience. In this study, by simplifying the force between feet-lock pipe primary lining, load-deformation characteristics were analyzed separately, inconsistent deformation was revealed. Next, combined with passive active bearing scheme, a design optimizati...

Analysis of advanced displacement in construction progress of tunnel excavation with weak surrounding rock is carried out by numerical method and comparison of model test result. In allusion to the problems of regional landslides and extruded large-deformation seriously impacting the stability of rock mass in construction process of large-section tunnel with weak surrounding rock, the elastic-p...

We establish an elaborate numerical model with which to investigate the deformation characteristics of segmental lining. The contains reinforcement and connecting bolts that previous studies have generally neglected. validated parameters using a full-scale test result. Based on this model, we studied Convergence, joint deformation, bolt stress, stress were systematically analyzed under differen...

The deterioration of rock mass and shotcrete lining has major consequences on the long-term performance tunnels in weak mass. In this study, behavior was simulated by using three-dimensional finite difference method, considering nonlinear mechanism. degradation weakening mechanical parameters, while modeled decreasing thickness. support pressure, internal force, displacement secondary were moni...

Seismic design loads for tunnels are characterized in terms of the deformations imposed on the structure by surrounding ground. The free-field ground deformations due to a seismic event are estimated, and the tunnel is designed to accommodate these deformations. Vertically propagating shear waves are the predominant form of earthquake loading that causes the ovaling deformations of circular tun...

The research on the dynamic response and influencing factors of shield tunnel lining under earthquake demonstrates significant engineering value in guiding design antiseismic tunnels. In this paper, a nonlinear finite element model soil-tunnel interaction is established based FLAC difference software, then Mohr–Coulomb elastoplastic plastic damage are used to simulate characteristics soil tunne...

There have been several difficulties with mesh-reinforced lining constructions because to the complex tunnelling circumstances and varying technical requirements. Thereafter, steel fiber reinforced concrete (SFRC) is promoted as a trustworthy replacement for linings. In this study, we take look at components typical characteristics of SFRC. Cracks or structural failures in linings are summarize...