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| RESEARCH ON ROCKFALL IMPACT PREVENTION OF CHEDIGUAN BRIDGE PIER，DUWHEN ROAD |
| HE Siming1，2，ZHUANG Weilin3，ZHANG Xiong4，JI Suiwang3，CHENG Qiang3 |
| (1. Key Laboratory of Mountain Hazards and Surface Process，Chinese Academy of Sciences，Chengdu，Sichuan 610041，China；2. Institute of Mountain Hazards and Environment，Chinese Academy of Sciences，Chengdu，Sichuan 610041，China；3. Sichuan Provincial Transport Department Hignway Planning，Survey，Design and Research Institute，Chengdu，Sichuan 610041，China；4. School of Civil Engineering and Mechanics，Huazhong University of Science and Technology，Wuhan，Hubei 430074，China) |
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Abstract Dujiangyan—Whenchuan road is the life line engineering of disaster areas hit by the 5•12 Whenchuan earthquake. Chediguan bridge on the road which stretches across the both sides of Mingjiang River collapsed due to rockfalls during the earthquake. After reconstruction，the new Chediguan bridge was open to traffic on May 12，2009. July 25，2009，at 4：40 or so，a large area collapse on the Mingjiang River bank high unstable rock occurred，rockfalls smashed the Chediguan bridge again. After investigation， there are many rocks existing in the mountains of both sides of Minjiang River，which will likely trigger the catastrophic events of rockfalls smashed the bridge. On this basis，the development of a new cushion structure of rockfalls impact piers is executed，using nonlinear finite elemnet method，considering the effects of nonlinear material properties，nonlinear geometry，nonlinear contacts and rebars during the processes. The results show that，the cushion structures could effectively buffer the impact of the rockfalls，the ability of rockfalls impact piers could be improved，and up to now，the consequences are very well.
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Received: 17 January 2012
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2013, Vol. 32 
