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| ANALYSIS OF DYNAMIC RESPONSE OF DEEP-BURIED CIRCULAR TUNNEL TO EXPLOSION SEISMIC WAVE |
| FAN Pengxian1,WANG Mingyang1,2,FENG Shufang3,LI Jie1,2,WANG Derong1 |
| (1. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact,PLA University of Science and Technology,Nanjing,Jiangsu 210007,China;2. School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing,Jiangsu 210094,China;3. Institute of Engineering Research and Design,Headquarters of Shenyang Military Area,Shenyang,Liaoning 110162,China) |
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Abstract The dynamic response of a deep-buried protected structure is of great importance under conditions of war or incident explosions. Hence there is a need to develop appropriate rapid algorithm to study this dynamic soil-structure interaction. In this paper,the lining structure of circular tunnel is discretized as a system with limited freedoms,and the explosion seismic wave is regarded as a series of dynamic forces acting on concentrated masses. The elastic resistances are simplified as elastic chain-pole by local deformation theory. Matrix force method is adopted to analyze the deformation of structure in elastic half-space,on the foundation of which the structural dynamic equation is established. By solving the structural dynamic equation,we can obtain the structure?s dynamic concentration coefficient,internal force,moment,displacements,etc.. The influences of rock grade,loading location,duration of positive pressure and incident wave angle are investigated through a case study.
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Received: 30 October 2012
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