Field investigation and full-scale model testing of mud pumping and its effect on the dynamic properties of the slab track-subgrade interface
Field investigation and full-scale model testing of mud pumping and its effect on the dynamic properties of the slab track-subgrade interface
复制标题
泵送泥浆现场调查及足尺模型试验及其对板式轨道-路基界面动力特性的影响
DOI：
10.1177/0954409718810262
复制
发表时间：
2019-09-01
影响因子：
2
通讯作者：
Liu, Kaiwen
中科院分区：
文献类型：
--
作者：
Huang, Junjie;Su, Qian;Liu, Kaiwen
旅客的舒适性和安全性是高速铁路运营中最重要的方面。冒泥是板式轨道与路基接触面上的一个典型问题，影响着乘客的舒适性和安全性。在本文中，各种实地调查和全尺寸模型的板式轨道和路基。分析了板式轨道-路基接触面上泥浆泵入的外部和内部特性以及泥浆泵入对板式轨道-路基动力特性的影响。研究结果表明，板式轨道结构混凝土基础的胀缝处仅发生泵泥现象。这是由于雨水通过伸缩缝中的裂缝渗入路基床。当路基上层在全尺寸模型中保持饱和时，发现在3.0 x 10（4）次加载循环后发生泥浆泵送。随着循环荷载的继续，路基表面与混凝土基层的振动比逐渐增大。此外，路基的累计沉降量不断增加。在2.0 x 10（6）次荷载循环后，发现大量由水和细颗粒组成的泥浆被挤出路基基床，路基基床表面出现泥浆泵送，导致混凝土基底和路基基床之间形成泥浆层，导致路基基床和混凝土基底之间失去接触。这降低了路基基床支撑板式轨道结构的能力。
Passenger comfort and safety are the most important aspects in the operation of high-speed railways. Mud pumping is a typical problem that occurs in the slab track and the subgrade interface, which influences passenger comfort and safety. In this paper, various field investigations and a full-scale model of the slab track and the subgrade are presented. The external and internal characteristics of mud pumping in the slab track-subgrade interface and the influence of mud pumping on the dynamic properties of the slab track-subgrade are analyzed. The results show that mud pumping only occurs at the expansion joints in the concrete base of the slab track structure. This happens due to the infiltration of rainwater into the subgrade bed through the cracks in the expansion joints. When the upper layer of the subgrade is kept saturated in the full-scale model, mud pumping is found to occur after 3.0 x 10(4) loading cycles. The vibration ratio of the subgrade surface to the concrete base gradually increases with continued cyclic loading. In addition, the cumulative settlement of the subgrade increased continuously. After 2.0 x 10(6) loading cycles, it was found that a large volume of slurry composed of water and fine particles was squeezed out of the subgrade bed, and mud pumping occurred on the surface of the subgrade bed leading to the formation of a mud layer between the concrete base and the subgrade bed, causing a loss of contact between the subgrade bed and the concrete base. This reduces the ability of the subgrade bed to support the slab track structure.