考虑三维波动的饱和土中管桩群桩的水平振动研究

发布时间：2018-11-18 11:40

【摘要】：考虑桩周饱和土和桩芯饱和土的三维波动效应研究了饱和土中管桩群桩的水平振动,得到了管桩群桩的水平动力阻抗。将桩周土和桩芯土视为两相饱和土,并利用多孔介质理论来描述其力学特性。运用数学物理手段求得了桩周饱和土和桩芯饱和土的水平动力阻抗。运用波的传播理论和叠加原理,同时考虑边界条件和三角函数的正交性,求得了管桩群桩中任一根管桩的水平作用力。考虑刚性承台处管桩桩顶位移协调条件和桩顶水平作用力平衡条件,得到了饱和土中管桩群桩的水平动力阻抗。以2×2管桩群桩为例分析和讨论了有关物理参量对饱和土中管桩群桩水平振动特性的影响。研究结果表明:实芯群桩与管桩群桩的水平动力阻抗都存在一定的差异,频率较小时需要考虑桩芯饱和土与桩周饱和土性质的差异对管桩水平动力阻抗的影响,管桩长径比和管桩壁厚对饱和土中管桩群桩水平振动的影响较大,在实际工程设计中需要重点考虑桩身尺寸。
[Abstract]:Considering the three-dimensional wave effect of saturated soil and saturated soil around pile, the horizontal vibration of pile group in saturated soil is studied, and the horizontal dynamic impedance of pile group is obtained. The soil around the pile and the soil in the pile core are regarded as two-phase saturated soil, and the mechanical properties of the soil are described by the theory of porous media. The horizontal dynamic impedance of saturated soil around pile and saturated soil of pile core is obtained by mathematical and physical means. Based on the theory of wave propagation and the principle of superposition, considering the orthogonality of boundary conditions and trigonometric functions, the horizontal force of any pipe pile in the pile group is obtained. The horizontal dynamic impedance of pipe pile group piles in saturated soil is obtained by considering the conditions of displacement coordination and horizontal force balance condition of pipe pile in rigid cap. Taking 2 脳 2 pipe pile group as an example, the effect of physical parameters on the horizontal vibration characteristics of pipe pile group in saturated soil is analyzed and discussed. The results show that there are some differences in the horizontal dynamic impedance between the solid core pile group and the pipe pile group, and the influence of the difference between the saturated soil and the saturated soil around the pile on the horizontal dynamic impedance of the pipe pile should be considered when the frequency is small. The ratio of length to diameter and the wall thickness of pipe pile have great influence on the horizontal vibration of pile group in saturated soil, so it is necessary to consider the size of pile body in practical engineering design.
【作者单位】：信阳师范学院建筑与土木工程学院;
【基金】：国家自然科学基金(No.U1504505) 河南省科技发展计划项目(No.142300410200) 河南省高等学校青年骨干教师资助计划项目(No.2013GGJS-121) 信阳师范学院南湖学者奖励计划青年项目(No.201506)~~
【分类号】：TU473.1

【相似文献】