考虑群桩效应的液化场地桩-土动力p-y曲线研究

p-y curve of the pile-soil interaction in soil liquefaction considering the pile group effect

为了研究液化场地单桩-土动力p-y曲线对群桩基础的适用性,本文基于OpenSees有限元计算平台,建立了液化场地群桩-土耦合体系地震反应数值模型,并通过离心机试验结果对模型的可靠性进行了验证;基于此数值模型探讨了“p乘因子法”中p-y曲线在液化场地群桩-土动力相互作用分析中的可靠性;通过反复地数值模拟与分析,以桩间距为控制指标,对现有“p乘因子法”中的p-y曲线进行了修正,构建了考虑桩间距效应的液化场地群桩-土动力相互作用p-y曲线,并通过离心机试验结果对其正确性进行了检验。

To examine the applicability of the p-y curve of a single pile-soil interaction in soil liquefaction to pile group foundation,a numerical model of the seismic response of a pile group-soil coupled system in soil liquefaction is developed in this paper based on the open system for earthquake engineering Simulation finite element method platform and verified by the test results of centrifugation.Then,the reliability of the p-y curve in the p-multiply factor method in the analysis of the pile group-soil interaction in soil liquefaction is discussed based on the verified numerical model.Finally,the p-y curve in the current p-multiply factor method is modified through repeated numerical simulations and analyses,adopting pile spacing as the control index.Accordingly,a new p-y curve of the pile group-soil interaction in soil liquefaction is proposed,which considers the pile spacing effect.The correctness is verified by the test results of centrifugation.