›› 2016, Vol. 37 ›› Issue (5): 1259-1267.doi: 10.16285/j.rsm.2016.05.007

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Nonlinear dynamic response of pile structure under earthquake loading

LIANG Shu-xiu1, SUN Zhao-chen1, ZHANG Wei-ping1, WANG Xing-gang2   

  1. 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian ,Liaoning 116024, China; 2. Nanjing Hydraulic Research Institute, Nanjing , Jiangsu 210029, China
  • Received:2014-07-23 Online:2016-05-10 Published:2018-06-09
  • Supported by:

    This work was supported by the National Founds for Innovation Research Team of China and the National High-tech R & D Program of China(863 Program).

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Abstract: As a classic elastoplastic constitutive model, the Cam Clay model can precisely describe the stress-strain relationship of remolded and normally consolidated clay. While soil stress experiences unloading or cyclic loading, the soil may become overconsolidated. An overconsolidated soil shows different mechanical behavior compared to its normally consolidated counterpart. To investigate the mechanical properties of overconsolidated soil, a subloading-surface Cam Clay model, which takes overconsolidation factor into account, is introduced. Then a comparative analysis is carried out for the triaxial compression tests and shear tests of overconsolidated soil, and the stress-strain relationship and OCR variation of the soil under cyclic loading are also studied in detail. The results show that overconsolidation factor can significantly influence the mechanical properties of soil, and the soil has higher yield strength than its normally consolidated counterpart. In addition, the dynamic response of free field under earthquake incidence is analyzed, showing that the influence of overconsolidation factor plays a very important role in the seismic response of soil ground, especially under high-magnitude earthquake incidence. Based on the results of the free-field analysis, the nonlinear dynamic response of a typical pile-soil coupled system under earthquake incidence is analyzed. The results show that the high-frequency component of structure is significantly suppressed by the influence of soil nonlinearity. Because the soil quickly turns into overconsolidated state under cyclic loading, its strength increases significantly, if the subloading-surface Cam Clay model is adopted, when the overconsolidation factor is taken into account, especially under the incidence of high-magnitude earthquake. Therefore, to guarantee the accuracy and reliability of the simulation for pile supported structure under earthquake incidence, it is necessary to account for the overconsolidation effect.

Key words: nonlinear response, pile-soil coupling, subloading surface Cam-clay model, overconsolidation

CLC Number: 

  • TU 473

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