Geomechanics and Engineering

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Soil vibration induced by railway traffic around a pile under the inclined bedrock condition

  • Ding, Xuanming (College of Civil Engineering, Chongqing University) ;
  • Qu, Liming (College of Civil Engineering, Southwest Jiaotong University) ;
  • Yang, Jinchuan (College of Civil Engineering, Chongqing University) ;
  • Wang, Chenglong (College of Civil Engineering, Chongqing University)
  • Received : 2019.10.26
  • Accepted : 2021.01.07
  • Published : 2021.01.25
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Abstract

Rail transit lines usually pass through many complicated topographies in mountain areas. The influence of inclined bedrock on the train-induced soil vibration response was investigated. Model tests were conducted to comparatively analyze the vibration attenuation under inclined bedrock and horizontal bedrock conditions. A three-dimension numerical model was built to make parameter analysis. The results show that under the horizontal bedrock condition, the peak velocity in different directions was almost the same, while it obviously changed under the inclined bedrock condition. Further, the peak velocity under inclined bedrock condition had a larger value. The peak velocity first increased and then decreased with depth, and the trend of the curve of vibration attenuation with depth presented as a quadratic parabola. The terrain conditions had a significant influence on the vibration responses, and the inclined soil surface mainly affected the shallow soil. The influence of the dip angle of bedrock on the peak velocity and vibration attenuation was related to the directions of the ground surface. As the soil thickness increased, the peak velocity decreased, and as it reached 173% of the embedded pile length, the influence of the inclined bedrock could be neglected.

Keywords

Acknowledgement

The authors would like to acknowledge the funding from the National Natural Science Foundation of China (grant no. 51878103), Innovation Group Science Fundation of the Natural Science Fundation of Chongqing, China (Grant No.cstc2020jcyj-cxttX0003), and Postdoctoral innovative talents support program, Chongqing (grant no. CQBX201903).

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