作　　者： ; ; ; ; (郑辉）;

机构地区： 浙江科技学院建筑工程学院

出　　处： 《计算力学学报》 2011年第4期553-559,共7页

摘　　要： 考虑沉桩过程中桩周土受到扰动产生软化或硬化的现象,建立了饱和土中径向分区桩竖向振动简化模型,通过分离变量方法,得到了桩竖向振动频域解析解和时域半解析解。分析了分区土对桩竖向振动特性的影响,数值计算结果表明,土层模量比、分区半径和桩底支承系数对桩竖向振动有较明显的影响。研究结果还表明,在较强的振动作用下,由于分区软化或强化作用的存在,桩土间的实际相互作用减弱,采用均质土完全黏结模型过高地估计了土对桩的约束能力,采用本文的扰动分区模型可以较好地反映桩土间的软化和硬化现象。 A simplified model of pile vertical vibration is established considering the nonlinear behavior of soil in the vicinity of the pile disturbed by pile driving.An analytical solution is deduced in frequency domain by means of variable separating method and then a semi-analytical solution is obtained using numerical convolution method.Numerical results from the frequency domain and time domain indicated that the equivalent modulus of soil have major effect on pile dynamic response,as well as the radius of disturbed radial zone and the bearing coefficient of pile toe.It can also be concluded that the actual interaction of pile and soil will be weaken due to the disturbed radial zone caused by pile vibration.A conclusion can be deduced that the interaction of pile and soil is overestimated under the ideal undisturbed model.The presented model can reflect the phenomenon of soften and harden in the interaction of pile and soil better than the perfect contact model.

关 键 词： 桩土相互作用 竖向振动 饱和土 打桩 径向扰动分区

领　　域： [理学] [理学]