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首页> 外文会议>Geotechnical frontiers >Three-Dimensional Soil-Pile Group Interaction in Layered Soil with Disturbed Zone by the Boundary Element Analysis
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Three-Dimensional Soil-Pile Group Interaction in Layered Soil with Disturbed Zone by the Boundary Element Analysis

机译：基于边界元分析的带扰动层状土中三维桩基相互作用

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As part of a current research project on dynamic soil-pile interaction, the parallelized boundary element method (BEM) code BEASSI was modified to enable analysis of three-dimensional dynamic behavior of pile groups surrounded by multiple multi-layered soil zones, with rigorous account of radiation and material damping. Dynamic soil-pile interaction was then analyzed in the frequency domain for a single pile and a 2><2 pile group, each surrounded by an inner disturbed-zone and an outer half-space zone. The layered inner zone enables effects of inhomogeneity, pile installation, and strain-dependent modulus and damping to be approximated, while the outer layered half-space zone can account for the far-field wave propagation in a vertically heter-ogeneous soil medium. The performance of the modified code is validated by comparison to static and dynamic benchmark solutions from the literature. A general formulation for analyzing the dynamic response of pile groups using impedance functions from the BEM analysis is also presented, with the above-ground pile segments modeled as beam-columns and the pile cap treated as a rigid body. For the present case of the 2×2 pile group, a 24×24 global stiffness matrix is formulated to capture the influence of each pile's six displacement degrees-of-freedom on the other piles due to pile-soil-pile interaction. The form and symmetries of the global stiffness matrix are verified by imposing displacements at the soil surface elevation for each pile cross-section separately, enabling future analyses to be performed more efficiently by specifying displacements at only one of the piles. Results of this study will lay the foundation for developing calibrated computational continuum models by analyzing upcoming full-scale vibration tests of pile groups.
机译：作为当前动态土-桩相互作用研究项目的一部分，对并行边界元方法（BEM）代码BEASSI进行了修改，从而能够对具有多个多层土壤区域的群桩的三维动态行为进行分析，并进行了严格的考虑。辐射和材料阻尼。然后，在频域中对单个桩和2 <2桩组的动力土-桩相互作用进行了分析，每个桩都被内部扰动区和外部半空间区包围。分层的内部区域使不均匀性，桩的安装以及与应变有关的模量和阻尼的影响得以近似，而外部分层的半空间区域可以解释远场波在垂直非均质土壤介质中的传播。通过与文献中的静态和动态基准测试解决方案进行比较，可以验证修改后的代码的性能。还提出了使用BEM分析中的阻抗函数来分析桩组动力响应的一般公式，地上桩段建模为梁柱，桩帽处理为刚体。对于2×2桩组的当前情况，公式化为24×24整体刚度矩阵，以捕获每个桩的六个位移自由度由于桩-土-桩相互作用而对其他桩的影响。整体刚度矩阵的形式和对称性通过分别在每个桩横截面的土壤表面高程处施加位移来验证，从而可以通过仅指定一个桩的位移来更有效地执行将来的分析。这项研究的结果将通过分析桩组即将进行的全面振动测试，为开发校准的计算连续模型奠定基础。

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