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Cyclic plastic deformation characteristics of subgrade under moving train wheel load

机译:动轮荷载作用下路基的循环塑性变形特征

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摘要

Cyclic plastic deformation of subgrade and other engineered layers is generally not taken into account in the design of railway bridge transition zones, although the plastic deformation is the governing factor of frequent track deterioration. Actual stress behavior of fine grained subgrade/embankment layers under train traffic is, however, difficult to replicate using the conventional laboratory test apparatus and techniques. A new type of torsional simple shear apparatus, known as multi-ring shear apparatus, was therefore developed to evaluate the actual stress state and the corresponding cyclic plastic deformation characteristics of subgrade materials under moving wheel load conditions. Multi-ring shear test results has been validated using a theoretical model test results; the capability of the multi-ring shear apparatus for replicating the cyclic plastic deformation characteristics of subgrade under moving train wheel load conditions is thus established. This paper describes the effects of principal stress rotation (PSR) of the subgrade materials to the cyclic plastic deformation in a railroad and impacts of testing methods in evaluating the influence of principal stress rotation to the track deterioration of rail track.
机译:在铁路桥梁过渡区的设计中,通常不考虑路基和其他工程层的循环塑性变形,尽管塑性变形是频繁的轨道恶化的控制因素。然而,使用常规的实验室测试设备和技术很难复制火车交通下的细粒路基/路堤层的实际应力行为。因此,开发了一种新型的扭转简单剪切装置,称为多环剪切装置,以评估在动轮载荷条件下路基材料的实际应力状态和相应的循环塑性变形特性。多环剪切试验结果已使用理论模型试验结果进行了验证;因此,建立了多环剪切装置在列车车轮载荷条件下复制路基循环塑性变形特征的能力。本文描述了路基材料的主应力旋转(PSR)对铁路中的周期性塑性变形的影响,以及测试方法对评估主应力旋转对铁路轨道劣化的影响。

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