›› 2010, Vol. 31 ›› Issue (11): 3516-3524.

• Geotechnical Engineering • Previous Articles     Next Articles

Test study and numerical analysis of seismic response of pile foundation of bridge at permafrost regions along Qinghai-Tibet Railroad

WU Zhi-jian 1, 3，CHE Ai-lan2，GHEN Tuo1，WANG Ping1   

  1. 1. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China; 2. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 3. Lanzhou Base of Institute of Earthquake Prediction, China Earthquake Administration, Lanzhou 730000, China
  • Received:2009-12-08 Online:2010-11-10 Published:2010-11-24

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Abstract:

Based on shaking table tests for scale model of pile foundation, which belongs to bridges at the unstable permafrost regions of high earth temperatures along the Qinghai-Tibet Railroad, on condition that the soil temperature around pile was below 0 ℃, it discovered that temperature increased at the spot of soil between piles and the interface of the piles and soil under seismic dynamic motions. Moreover, under the conditions of natural state and soil temperature increase, the characteristics of seismic response of pile foundation of the Qingshui River Bridge were analyzed by dynamic finite element analysis. It indicated that seismic response of the permafrost layer and pile foundation, under seismic motions, was obviously sensitive to the increase in temperature, while earth temperature above -1 ℃. Under artificial wave with exceedance probability of 2% in 50 years loading, the slippage and escape, between pile foundation and soil layer around, were enlarged due to relative displacement of pile foundation. Especially, on condition that temperature above -1 ℃, the slippage was so obvious that it influenced the stability of whole pile foundation.

Key words: permafrost, pile foundation, shaking table test, dynamic finite element analysis, seismic response

CLC Number: 

  • TU 435
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