Lining Fatigue Test and Influence Zoning of Tridimensional Cross-Tunnel under High-Speed Train Loads

Abstract

Tridimensional cross tunnels usually manifest the vulnerable components of a high-speed railway caused by the sophistication of the structural pattern and the continuous shock from the train. The frequent defect of tunnel lining at the intersection would affect the safe operation of the two rails. As a result, attention has been paid to fatigue damage caused by the long-term dynamic load from a running train, in order to ensure the safety and serviceability of the cross tunnel lining. However, an influence zoning method with respect to tunnel crossing for the direct estimation of whether the lining structure is damaged due to the train load, and to what extent, is unavailable. In this paper, a systematic study that consists of numerical simulation and fatigue damage experiment is conducted to develop an approximate method to enable practicing engineers to evaluate reasonable design parameters. The initial static stress, which corresponds to the static tensile stress of secondary lining under the stratum load, and the maximum dynamic stress, which refers to the maximum dynamic tensile stress under the train load, are estimated according to the numerical simulation. A simplified damage evolution model and its parameters are identified on the basis of a systematic fatigue damage experiment. Finally, the influence zoning method is conducted on the basis of two criteria, namely (1) that initial stress level should not exceed 0.6, and (2) that load cycles should not exceed N = 2 × 106 times. Thus, the practicing parameters during the cross tunnel design, such as surrounding rock mass, cross angle, rock pillar thickness between two tunnels, and train speed can be utilized conveniently by using the proposed calculation charts, according to the identification of initial stress level and the magnitude of dynamic stresses caused by the train load.

General Analytical Method to Predict the Spatial–Temporal Distribution of Extreme Pressure in High-Speed Railway Tunnels in the Post-Train Stage

“…[3,7,8]; and leads to vibration discomfort for passengers [9], threatening the safety of transportation systems [10,11]. For example, in 1999, influenced by long-term aerodynamic loads, a block of lining detached from the Rebunhama high-speed railway tunnel in Japan, which caused train derailment and the cancellation of 51 subsequent trains [1,12]. More importantly, compared with the train passing stage, pressure fluctuation in the post-train stage (after a train exits from a tunnel) has a longer duration and slower attenuation as there is no interaction between the wave and the train [13], but the pressure amplitude is similar or even higher.…”

Dynamic Response of Pile-Soil Foundation with an Adjacent Tunnel under the High-Speed Train Loads: A Case Study

“…More and more high-speed trains are running on high-speed railways between cities. As a typical vibration load, the vibration load of high-speed trains induces the dynamic response of the pile-soil foundation and nearby structures [3][4][5][6]. Under a long-term vibration load, nearby structures may have problems such as cracking and concrete block spalling, and the original damage and destruction have a more adverse impact on the structure [7,8].…”

Dynamic Response Analysis on Stress and Displacement of the Shield Tunnel Structure and Soil Layer under Train-Induced Vibration in Xiamen Metro Line 6

“…Pan et al (2020) developed the train-tunnel-soil finite element model to analyze the dynamic responses of acceleration, displacement, and strain of the soils around the tunnel under train dynamic load [22]. Yang et al (2020) conducted a systematic study that consist of numerical simulation and fatigue damage experiment and researched fatigue damage caused by the long-term dynamic load from a running train, in order to ensure the safety and serviceability of the cross tunnel lining [23]. Tian et al (2021) built a threedimensional numerical model of shield tunnel lining structure to study its dynamic reaction and fatigue crack propagation under the train vibration load [24].…”

“…Funding: This research was funded by the National Natural Science Foundation of China (Grant No. : 52178388), the Scientific and Technological Development Projects of FSDI (17)(18)(19)(20)(21)(22)(23)(24)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36), the Shannxi Province Natural Science Foundation Research Program-Joint Fund Project (2021JLM-50).…”