Numerical modeling of the dynamic behaviour of tunnel lining in shield tunneling

Abstract

This paper studies the impact of metro train operation on the shield tunnel lining and its soft foundation. A complex elasto-plastic 3D dynamic finite difference model is used by fully considering the joints to show the dynamic response of the shield tunnel buried in soft soil under the vibrating load. The simulation result for joint was compared with the result when the joint was not considered. Through the formulation of computationally efficient numerical models, this paper examines the dynamic behaviour of these two particular types of lining structure. The differential Eq.s governing the vibration of a curved beam is discretized by the FLAC 3D code. Numerical results demonstrate that an operating metro train induces significant dynamic response in the structure of the lining of the shield tunnel and its soft foundation. Of two horizontally symmetric the one near the joint is more severe in its dynamic response than that of the one far from the joint; the nearer the zone of the foundation soil to the lower half of the segment-ring, the more severe the dynamic response. The dynamic response influenced by joints is more severe than the response not influenced by joints, showing that the non-joint assumption is somewhat impractical.

Study of Non-uniform Seismic Response of Intercity Tunnels with Defective Shields

“…S. Gharehdash [8] and others compared the dynamic response characteristics of shield tunnels in soft ground with and without considering the joint effect, and the results show that there is a large gap between the assumption of not considering the joint effect and the actual situation, but the numerical model does not consider the tube piece modeling, and does not consider the bolts and reinforcement structure, and for the joint of the tension and misalignment of the deformation state cannot be embodied.…”

MEMS technology and applications in geotechnical monitoring: a review

“…Furthermore, using strain sensors, observations of micro-strains [166], dynamic strength [167], elastic parameters [168] and crack initiation and propagation processes of concrete segments under dynamic loading [21] are all feasible. Concrete segments and joints may encounter with crack, creep and failure under vibration due to train-induced impact loading that put the safety and stability of the tunnel on danger [169]. Measurement in cast in place or shotcrete liners normally require use of strain cell that can be placed between segments of precast concrete liners.…”

Dynamic Characteristic and Fatigue Accumulative Damage of a Cross Shield Tunnel Structure under Vibration Load

“…For the vibration effects caused by train, studies have been conducted on the dynamic response characteristics of tunnels under the train vibration. Gharehdash and Barzegar [27] used a complex elastoplastic 3D dynamic finite difference model by fully considering the joints to study the dynamic response of the shield tunnel buried in soft soil under the vibration loads; Gupta et al [28] presented the experimental validation of a numerical model for the prediction of subway induced vibrations; Gupta et al [29] used a coupled periodic finite element-boundary element model to study the vibration response from a Thalys high-speed train in the Groene Hart tunnel; Lin [30] studied the dynamic response of the tunnel under different conditions, such as the preconstruction of the train vibration load.…”