Water Pressure Properties Research in Non-ballasted Track Crack under Cyclic Loading
Water Pressure Properties Research in Non-ballasted Track Crack under Cyclic Loading
复制标题
循环荷载下无砟轨道裂缝水压特性研究
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
XU gui hong
中科院分区：
文献类型：
--
作者：
XU gui hong
无砟轨道的破坏问题主要由裂缝引起，特别是雨水影响下的破坏问题日益严重，本工作的目的是分析裂缝中的水压特性。研究了无砟轨道结构裂缝中的水压特性。实验和数值。首先，预先存在的裂缝。混凝土试件510×1290×80mm尺寸为。循环下的产液、流体-裂缝相互作用试验。执行负载。水压在。不同的位置，不同的负载频率。同时也测量了振幅。然后，基于流固相互作用力学的有限元模拟。被执行。从这项研究中，我们确定。水压在正压力和负压力之间交替变化。在循环荷载作用下为负值，且随。裂纹深度、载荷幅值和载荷频率的增加。此外，两者之间的关系。水压、荷载幅度和荷载频率均可。拟合成多项式表达式。最后是分析性的。提出了模型。
The damage issue of non-ballasted track mainly caused by the crack, especially that under the influence of rainwater becomes gradually serious, the aim of this work is to analyze the water pressure properties in crack. The water pressure properties in cracks of non-ballasted track structures are nvestigated.experimentally and numerically. First, Pre - existing crack.concrete specimen with 510×1290×80mm dimensions was.produced, and fluid-fracture interaction tests under cyclic.loads were performed. The water pressure variations at.different locations and with different loads frequencies.as well as amplitudes were measured. Then, fluid-solid.interaction mechanics-based finite element simulations.were performed. From this study, it was determined that.the water pressure alternates between positive and.negative values under cyclic loading, and increase with.the increase of crack depth, loads amplitude and loads.frequency. Furthermore, the relationship between the.water pressure, loads amplitude and loads frequency can.be fitted into a polynomial expression. Finally, the analytical.model is proposed.