Advances and prospects of seismic research on pile foundations in soft soil
Pile foundation is a commonly used foundation form in soft soil.When an earthquake occurs,it is accompanied by the settlement of the soft soil foundation,leading to damage and failure of the founda-tion,causing huge casualties and property losses.This problem has long been widely concerned by the seis-mic engineering community.Due to the lack of actual observation data on soft soil seismic subsidence,there are problems such as unclear estimation of seismic subsidence,unclear mechanism of soil-pile inter-action considering soft soil seismic subsidence and negative frictional resistance,and insufficient under-standing of seismic damage to pile foundations.This article comprehensively reviews the main methods and means of seismic resistance of pile foundations from the perspectives of model testing,numerical analysis,simplified theoretical analysis,and empirical methods by collecting and organizing engineering seismic damage data and on-site scientific research experience of major earthquakes in recent years both at home and abroad.It summarizes the latest research results of seismic resistance of pile foundations in soft soil and elucidates the phenomena and mechanisms of seismic damage to pile foundations in soft soil.A sys-tematic review and summary of the latest research results of seismic resistance of pile foundations in soft soil are made.Most studies have shown that the dynamic damage and failure of pile foundations are the common result of the pile-soil dynamic interaction under earthquake action,where foundation failure such as soft soil subsidence is an external cause,and the defect in the strength of the pile foundation is an inter-nal cause.Finally,in response to the existing problems and shortcomings of current research work,this arti-cle proposes prospects of and suggestions for future research directions and work ideas.Especially in the absence of earthquake damage experience and observation records,the method of efficient and scientific model tests is an important technical idea to solve the issue of pile soil interaction.
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