摘要: 无砟轨道伴随我国高速铁路大规模修建得到了广泛应用，但以裂纹为主要形式的伤损问题也逐步凸显，特别是雨水对伤损的影响尤为突出。本文针对 CRTSII 型无砟轨道层间裂纹中水流特性问题，应用流固耦合理论及其统一控制方程，基于双向二维流固耦合场计算原理，建立了高频列车荷载作用下 CRTSII 型板式轨道砂浆层下裂纹中水流特性模拟，结果表明： 1 ) 当高频荷载作用于下，随着裂纹长度的增加，裂纹内部各计算点压强与裂纹的长度基本呈线性变化，越是靠近裂纹尖端，压强越大。 2 ) 裂纹内部水流速度，随着裂纹深度的增加而减少，在裂纹的尖端时最小。

Abstract: The non-ballasted track had been widely used with the massive construction of the high-speed railway in China. The damage issue of non-ballasted track mainly based on the flaw was becoming gradually evident, especially the influence of rainwater to the damages. Nowadays there was a lack of the systematic research on the relevant problems at home and abroad. This paper focuses on the flow characteristics of CRTSII non-ballasted track interlayer crack. Unified governing equation and mathematical model were established in solid and fluid domain, based on the two-way coupled field computation, at the high speed train loads action. The water flow characteristics had been simulated in CRTSII non-ballasted track Interlayer crack. Analysis shows that: 1) At the high-speed train loads action, crack surface pressure of every monitor is linear increased with the crack length, the more close the crack tip, the more pressure; 2) with crack length increased the water velocity of crack internal reduce.