Experimental study on load amplitude impact on dynamic response of XCC pile-raft composite foundation [荷载振幅对X形桩-筏复合地基动力响应特性影响的试验研究]

作者：Sun G.; Kong G.^*; Liu H.; Chu J.

来源：Journal of Central South University(Science and Technology), 2020, 51(2): 499-506.

DOI：10.11817/j.issn.1672-7207.2020.02.023

• Amplitude
• Dynamic load
• Model test
• Pile-raft composite foundation
• XCC pile

Based on large scale model test method, experimental study on dynamic response of cast-in-situ X-shaped concrete (referred as XCC) pile-raft composite foundation embedded in sand was carried out. The sine wave load was used, and the amplitude of cyclic loads was changed. The velocity response of raft, dynamic stress response of pile, dynamic soil pressure response of XCC pile-raft composite foundation under cycle loads were measured. The dynamic response mechanism of the XCC pile-raft composite foundation was discussed. The results show that the vibration velocity of pile-raft composite foundation gradually decreases and the dynamic stress response of pile decreases approximately in a ware shape with the depth. The velocity response, dynamic stress response of pile top, and the dynamic soil pressure response nearly linearly increase with the increase of load amplitude. Gravel cushion layer has a good damping effect.

• 单位
  三峡大学