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JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2020, 37(4): 85-89.ĬHEN Ling-wei, LI Cong-an, LIU Wei, PENG Wei-ping, ZHANG Qing-hua. Numerical Analysis of Seismic Liquefaction of Underwater Shield Tunnel SHI Shi-bo, CHEN Bi-guang, SHU Heng, LI Xiu-juan, ZHAO Xian-yu, XIAO Li. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2020, 37(5): 1-10. Simplified Analysis of Forces Acting on Reinforced Concrete Lining inHigh Pressure Water Conveyance Shield Tunnel under SurroundingRock Condition
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Soil Dynamics and Earthquake Engineering, 2015, 76: 13-28. Shaking Table Tests and Numerical Simulations on a Subway Structure in Soft Soil. Soil Dynamics and Earthquake Engineering, 2016, 83: 81-97. Seismic Ground Motion Amplification Pattern Induced by a Subway Tunnel: Shaking Table Testing and Numerical Simulation. Shaking Table Test of Utility Tunnel Under Nonuniform Earthquake Wave Excitation.Soil Dynamics and Earthquake Engineering, 2010, 30(11): 1400-1416. Analyses of the Effect of Seismic Behavior of Shallow Tunnels in Liquefiable Grounds.Tunnelling and Underground Space Technology, 2010, 25(5): 543-552. The proposed measurement scheme in this paper guaranteed the data collection in shaking table test of metro shield tunnel and provided a reference for other model tests of underground structures.
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Therefore, the main and auxiliary observation sections should be at least 1 D away from the end of the structure. At the end of the structure, the end restraint effect on observation section 0.26 D(D represents the structure width) away from the end of the structure reached 13.58%, which is about 3 times that 1 D from the end. The acceleration responses and dynamic pressures between structure and soil varied with height, hence the dynamic differences and variations of each point can be measured by arranging sensors at different heights of the structure. The maximal seismic stress responses of tunnel structure were located in an angle of 30° to the top and the bottom of tunnel which can be considered as the key points of strain measurement. The acceleration amplification factor of foundation was related with buried depth and seismic waveform. Results unveiled that the high-frequency component of seismic waves were filtered and the low-frequency component were amplified by foundation soil.
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According to the influential factors and characteristics of soil-metro structure’s seismic responses, the layout principle of sensors was summarized, which defined the location of the observation section and the main observation indexes of shield tunnel structure in shaking table test. The acceleration responses, the displacement responses and the law of dynamic strain of soil-metro shield tunnel system were studied. The seismic responses of metro shield tunnel in soft soil area were analyzed by using finite-infinite element coupled analysis model.