›› 2016, Vol. 37 ›› Issue (9): 2577-2584.doi: 10.16285/j.rsm.2016.09.019

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Scouring effects on lateral vibration of caisson-piles composite foundation considering stress history of sand

TU Wen-bo1, 2, HUANG Mao-song1, 2, ZHONG Rui1, 2   

  1. 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
  • Received:2014-10-27 Online:2016-09-12 Published:2018-06-09
  • Supported by:

    This work was supported by the Key Basic Research Project of China (973 Program) (2013CB036304) and the National Natural Science Foundation of China (91315301).

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Abstract: Scouring effect has a significant impact on the lateral vibration of caisson-piles composite foundation because of the change in stress history and the reduction of soils around the foundation. Based on the dynamic Winkler model proposed by author, a computational method of the dynamic impedance of caisson-piles composite foundation influenced by scouring effect with considering stress history is developed. Then sponge boundary dynamic FEM are used to validate the theoretical results. Finally, the proposed procedure is used to analyze a practical engineering. The results show that scouring effect has a significant impact on the dynamic stiffness and damping coefficient, and the more scour depth increased, the more remarkable influence on the results. This implies that it is not enough to only consider the loss of soil around the composite foundation for scouring effect, the change of stress history can further weaken bearing capacity of composite foundation and enlarge the dynamic response of structure, thus ignoring the change of stress history will result in an overestimate of value of dynamic impedance, and the change of stress history accompany with an apparent increase in amplitude of resonant response of composite foundation, while it has no effect on the value of resonant frequency.

Key words: scouring, dynamic impedance, stress history, caisson-piles composite foundation

CLC Number: 

  • TU 470

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[3] LIU Lin-chao, YAN Qi-fang, YAN Pan. Horizontal vibration of pipe pile groups in saturated soil considering three-dimensional wave effects [J]. , 2017, 38(10): 2817-2825.
[4] LI Chuan-xun, XU Chao, XIE Kang-he，. Nonlinear consolidation of clayed soil considering non-Darcy flow and stress history [J]. , 2017, 38(1): 91-100.
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[6] CHEN Qun, PENG Jun, ZHU Fen-qing，. Experimental study of contact scouring between sandy gravel and sand [J]. , 2016, 37(S1): 295-300.
[7] YANG Xiao-feng , ZHANG Chen-rong , YUAN Ju-yun , . Equivalent-strain wedge method for laterally loaded pile in sand considering scouring effect [J]. , 2015, 36(10): 2946-2950.
[8] SHENG Zhi-qiang，TENG Yan-jing. Study of test methods of saturated soil shear strength considering effects of stress history [J]. , 2014, 35(S2): 107-113.
[9] ZHAO Hong , GAO Guang-yun , JIANG Zhou , . An improved model for dynamic impedance of pile groups based on vector fitting-Routh method [J]. , 2014, 35(9): 2448-2454.
[10] LIU Lin-chao, YAN Qi-fang. Study of lateral dynamic impedance of pipe pile in saturated soil [J]. , 2014, 35(5): 1348-1356.
[11] LIU Wei-zheng ，SHI Ming-lei ，MIAO Lin-chang . Experimental study of permeability coefficient of natural saturated clay and its prediction model [J]. , 2013, 34(9): 2501-2507.
[12] YANG Jin-bao、 FENG Xia-ting、 PAN Peng-zhi、. Experimental study of permeability characteristics of single rock fracture considering stress history [J]. , 2013, 34(6): 1629-1635.
[13] LIU Lin-chao, YAN Qi-fang, YANG Xiao. Horizontal vibration of pile group in saturated soil based on theory of porous media [J]. , 2011, 32(3): 767-774.
[14] GAO Guang-yun, ZHAO Yuan-yi, GAO Meng, YANG Cheng-bin. Improved calculation for lateral dynamic impedance of pile groups in layered soil [J]. , 2010, 31(2): 509-515.
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