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Suitability of Empirical Equations for Estimating Permanent Settlement of Railway Foundation Materials Subjected to Cyclic Loading with Principal Stress Rotation

Canadian Geotechnical Journal(2021)

Univ Southampton | Univ Calgary

Cited 1|Views21
Abstract
This paper uses the results of a series of laboratory tests with cyclic principal stress rotation to assess the suitability of a number of empirical equations for estimating the development of plastic settlements in railway track foundations. The laboratory tests were carried out on three sand–clay mixes representative of railway track foundation materials, in both free-to-drain and undrained conditions. The results of a non-linear regression analysis demonstrate that the drainage conditions are the key factor affecting the estimation accuracy of the models, with the clay content playing a secondary role. The correlation coefficient was generally higher in free-to-drain than in undrained conditions and reduced slightly with increasing clay content.
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cyclic tests,principal stress rotation,cyclic stability,axial strain,resilient stiffness,empirical models
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要点】:本研究通过循环主应力旋转的实验室测试,评估了多种经验方程在预测铁路路基材料持久沉降方面的适用性,发现排水条件是影响模型估计准确度的关键因素,粘土含量起次要作用。

方法】:采用非线性回归分析法评估经验方程的适用性。

实验】:在自由排水和不变排水条件下,对三种沙粘土混合物(代表铁路路基材料)进行实验室测试,发现自由排水条件下的相关系数普遍高于不变排水条件,且随着粘土含量的增加,相关系数略微降低。