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Prediction method of multidimensional consolidation for assessment of performance on soil structures

土结构性能评估的多维固结预测方法

基本信息

批准号：
17580214
负责人：
NISHIMURA Shin-ichi
金额：
$ 2.4万
依托单位：
Okayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17580214/
关键词：
multi-dimensional consolidation inverse analysis displacement measurement pore water pressure measurement model test soft ground parameter identification performance design 遠心力載荷試験

项目摘要

Recently, performance-based designs have been developed in the Sell of geotechnical engineering. As a performance requirement, the critical deformation is determined. To verify the performance, accurate deformation predictions are required Numerical methods, such as the finite element method can be applied to pre-construction designs. While, after construction, in-situ behavior such as deformation and pore water pressure is generally measured and then employed to make precise deformation predictions For this task, the inverse analysis method is useful, and was discussed in this research.Although various nonlinear models exist, the models such as the elasto-plastic constitutive equations require a lot of parameters. And since the measured data obtained from the in-situ are limited, such models am not convenient for inverse problems. In this research, therefore, a simplified hyperbolic model was employed to simulate nonlinear shear behavior The hyperbolic model used here requires only on … More e additional parameter compared with the linear elastic maid. And the cross anisotropy of the ground was assumed in this research in order to accurately predict the lateral displacement, and the dilatancy behavior Furthermore, the stochastic non-linear consolidation model, which has been developed by the authors, was applied to present the consolidation hardening and the reduction of the permeabilityTo verify the accuracy of the proposed method, the two-dimensional consolidation model tests were carried out In the test equipment, the constraining pressure is applied by the air and the local load is applied with the loading piston. The displacements are measured at multi points through the CCD, and also the pole water pressures at three points by the pressure transducer. As experimental materials, Kaolin clay, which has low plasticity and Kasaoka marine clay which has high plasticity were employed here. For the measured data, the proposed method was applied and the possibility of its practical use was verified. Less

近年来，基于性能的设计在岩土工程领域得到了发展。作为性能要求，确定了临界变形。为了验证性能，需要精确的变形预测数值方法，如有限元法，可应用于施工前设计。然而，在施工后，通常测量现场的行为，如变形和孔隙水压力，然后用于进行精确的变形预测对于这一任务，反分析方法是有用的，并在本研究中进行了讨论。虽然存在各种非线性模型，如弹塑性本构方程的模型需要很多参数。但由于现场实测资料有限，这种模型不便于反问题求解。因此，本研究采用简化的双曲线模型来模拟非线性剪切行为。 ...更多信息与线弹性模量相比，增加了一个附加参数。为了更准确地预测地基的侧向位移和渗透性，本文还采用了随机非线性固结模型来描述地基的固结硬化和渗透性折减，以验证本文方法的准确性。在试验装置上，采用空气施加约束压力，用加载活塞施加局部荷载，进行了二维固结模型试验。通过CCD测量多点位移，通过压力传感器测量三点极点水压力。作为实验材料，高岭土，这具有低塑性和Kasaoka海洋粘土，这具有高塑性。对实测数据进行了应用，验证了该方法在实际应用中的可行性。少