Numerical simulation of the dynamic response of ground penetrating ultra shallow-buried shield tunnel
ZONG Junliang1, RAO Qian1, WANG Qi2, YU Haitao2,3
1. Shanghai Huangpu River Cross-river Facilities Investment Construction Development Co., Ltd., Shanghai 200002, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
Abstract: The seismic dynamic response law of ground penetrating shield technology(GPST)tunnel was studied. A three-dimensional dynamic finite element model of the ground-penetrating shield tunnel was established. The model took into account the dynamic characteristics of the Shanghai site and reasonably simulated the dynamic artificial boundary, the longitudinal and annular joints of the tunnel lining, and the soil-structure interactions. The tunnel response and site response were analyzed, and parametric analyses were performed for bolt preload, longitudinal slope, ground surcharge loading and top opening conditions. The results showed that the GPST tunnel structure could amplify the ground acceleration response, and the structural diameter deformation and acceleration response of the exposed surface section would be significantly increased. The results of the parametric analysis showed that increasing the bolt preload, increasing the longitudinal slope of the tunnel and setting a surface surcharge plate could improve the structural response; however, the top opening would significantly amplify the tunnel dynamic response.
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2023, Vol. 5 
