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桩基础的动力计算是桩基动力学中非常复杂而又极为重要的课题之一,国内外研究得还不很完善。本文根据粘弹性波动理论建立了有回填土影响时考虑桩一土一基础相互作用时桩基础在水平—摇摆耦合振动作用下的动力计算方法,提出了桩基础体系的动力刚度与阻尼表达式和动力反应计算公式;提供了软土地区有效桩长的确定方法和设计曲线。理论计算与原位测试分析表明,本文方法所得计算结果比现有方法更接近于实测值。最后并指出了用M.Novak方法得出的结果与国内外试验资料并不符合。
The dynamic calculation of the pile foundation is one of the most complex and extremely important topics in the dynamics of the pile foundation. The study at home and abroad is still not perfect. Based on viscoelastic wave theory, this paper establishes a dynamic calculation method for pile foundation under horizontal-rocking coupled vibration considering the interaction between pile and soil under the influence of backfill, and presents the dynamic stiffness and damping expressions of pile foundation system. Dynamic response calculation formula; provides effective method for determining the length of soft soil and design curves. Theoretical calculation and in-situ test analysis show that the results obtained by this method are closer to the measured values than the existing methods. Finally, it is pointed out that the results obtained by using the M.Novak method do not meet the domestic and foreign test data.