Experimental investigation and numerical analysis of segment-soil interaction in high-speed railway tunnels in marine soft soil
ZHENG Hemin1,2, LIU Xueting3,4, QIN Chengshuai3*, WANG Weifeng3,5, LI Chong3, Du Haishui6#br#
(1. China Railway Design Group Co., Ltd., Tianjin 300308, China;
2. National Engineering Research Center for Digital Construction and Evaluation of Urban RailTransit, Tianjin 300308, China;
3. Structural Health Monitoring and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China;
4. School of Traffic and Transportation, Shijiazhuang Tiedao University, Shijiazhuang 050043, China；
5. School of Safety Engineering and Emergency Management, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China;
6. Gelvsi (Hebei) Intelligent Equipment Co., Ltd., Hengshui 053499, Hebei, China）
Abstract: To investigate the tunnel-soil interaction mechanism and settlement deformation characteristics of the high-speed railway tunnel in marine soft soil under train-induced vibration loads, a 1:40 scale model test was conducted based on the Zhanjiang Bay Subsea Tunnel, the control engineering of the Guangzhou–Zhanjiang High-Speed Railway. Numerical simulations were also carried out, and the dynamic response distribution and deformation development of the tunnel structure and surrounding soil were further analyzed. The results showed that, under train-induced vibration loads, the acceleration response of the soil surrounding the tunnel was found to exhibit significant spatial nonuniformity, generally characterized by a distribution pattern of “stronger below and weaker above, and greater near the tunnel and smaller farther away.” In particular, the soil at and near the tunnel base was directly affected by the train load, and thus exhibited the most pronounced dynamic response. Affected by the combined effects of soil damping, wave dispersion, and energy dissipation at the tunnel–soil interface, the vibration energy was gradually attenuated with increasing propagation distance, and significant differences were observed in the vibration attenuation patterns along different propagation directions. Compared with lateral propagation, the vertical vibration was more significantly attenuated during its propagation into the overlying and underlying soils. After lateral vibration propagated into the middle and far field regions, the attenuation rate was relatively reduced, indicating a stronger capacity for sustained propagation. Under cyclic loading, the ground settlement was found to exhibit significant cumulative and staged characteristics. The overall settlement trough was characterized by a distribution pattern of larger settlement in the middle and smaller settlement on both sides. Settlement developed rapidly during the initial loading stage, and the settlement generated during the first 1920 loading cycles accounted for 71.4% of the total settlement. As the number of cycles increased, the soil was gradually densified, the additional deformation induced by each individual load decreased, and the settlement growth rate was reduced. The settlement evolution was characterized by a transition from rapid accumulation to gradually decelerated development.
郑贺民, 刘雪婷, 秦承帅, 王伟锋, 李冲, 杜海水. 海相软土高铁隧道管-土相互作用试验研究与数值分析[J]. 隧道与地下工程灾害防治, .
ZHENG Hemin, LIU Xueting, QIN Chengshuai, WANG Weifeng, LI Chong, Du Haishui. Experimental investigation and numerical analysis of segment-soil interaction in high-speed railway tunnels in marine soft soil. Hazard Control in Tunnelling and Underground Engineering, 0, (): 1-20.
