A 1D-modelling approach for simulating the soil-pile interaction mechanism in the liquefiable ground
A 1D-modelling approach for simulating the soil-pile interaction mechanism in the liquefiable ground
复制标题
模拟可液化地基中土-桩相互作用机制的一维建模方法
DOI：
10.1016/j.soildyn.2022.107285
复制
发表时间：
2022
影响因子：
4
通讯作者：
Shadlou M
中科院分区：
文献类型：
--
作者：
Shadlou M
在大量的文献中，已经确定并标记了用“非线性Winkler地基梁”方法（作为一维模型）获得的动态响应与可液化地基中的实际桩行为之间的差异。在这项研究中，提出了一个1D制定的土壤桩系统，提供了相当多的见解的物理桩周围的土壤行为在可液化的地面和它的依赖于土壤性质。与可能或可能不具有普遍性的力学模型不同，所提出的方法由土壤性质控制。通过桩响应主要受桩附近单位体积上土壤响应影响的概念，通过引入包含土壤体积变化的体积约束来假设宏观单元。宏观单元的非线性耦合在体积和畸变行为之间，其中假定增量塑性功。因此，刚度矩阵算子，而不是一个标量值，连接桩阻力分量与位移分量。在此基础上，提出了一种次弹性边界面模型，该模型能够反映可液化地基中桩土相互作用的复杂机理，与现场实测和离心试验结果具有很好的雅阁性，而地震作用下的计算时间缩短到几分钟。通过计算软土地基中桩-土相互作用系统的瞬时周期和阻尼，给出了一维模型方法的应用。
The discrepancies between the dynamic response obtained with “Beam on the nonlinear Winkler Foundation” method, as a 1D model, and the actual pile behaviour in the liquefiable ground have been identified and marked in the vast body of literature. In this study, a 1D formulation is presented for the soil-pile system which provided considerable insights on the physics of the soil behaviour around the pile in the liquefiable ground and its dependence on soil properties. Unlike the mechanical models that may or may not be generalizable, the presented method is controlled by the soil properties. By a concept that the pile response is mainly influenced by the response of soil located on a unit volume in the pile vicinity, a macro-element is hypothesized by introducing a volumetric constraint incorporating the soil volume changes. The nonlinearity of macro-element is coupled in between volumetric and distortional behaviours where an incremental plastic work is assumed. Hence a stiffness matrix operator is used, instead of a scalar value, to link the pile resistance components with displacement components. A hypo-elastic bounding surface model was developed in this framework to capture the complex mechanism of soil-pile interaction in the liquefiable ground and presents a very good accord with available field measurement and centrifuge study while the computational time reduces to a couple of minutes for an earthquake excitation. An application for the presented 1D modelling approach is presented by calculating the instantaneous period and damping of the soil-pile interaction system in the liquefiable ground.
登录
查看更多内容
影响因子：
5.3
作者：
D. Liyanapathirana;H. Poulos
通讯作者：
D. Liyanapathirana;H. Poulos
影响因子：
3.7
作者：
K. Tokimatsu;H. Suzuki
通讯作者：
K. Tokimatsu;H. Suzuki
砂土地震分析中横向土桩界面特性的评估
影响因子：
4
作者：
Ng Tran;T. Bong;Byeong;Sung
通讯作者：
Sung
影响因子：
3.3
作者：
Ziqin Zhou;H. Adeli
通讯作者：
Ziqin Zhou;H. Adeli
土壤动力学的简化方法
影响因子：
4
作者：
R. Dobry
通讯作者：
R. Dobry