研究目的: 由于城际轨道交通、客运专线等高速铁路穿越经济发达地区，铁路用地紧张，轨道对路基工后沉降的要求较高。路堤式 U 型结构既能节省用地，同时又能提高路堤的稳定性，降低路基的工后沉降，为地质条件较差的平原区修建城际轨道交通、客运专线等高速铁路路基提供借鉴。
研究结论: 通过对路堤式 U 型结构的受力和变行规律分析，得出了底板和边墙的应力应变随结构高度和厚度的变化规律。底板和边墙的 X 轴方向弯矩是控制弯矩，底板弯矩的最大值在边墙处，边墙弯矩的最大值在底部。路堤式 U 型结构的整体稳定性较高，变形较小，能够有效控制路基变形。
Research purposes: As intercity rail transit and passenger dedicated line pass through the developed areas，the land resource in these areas becomes less and less，so the track requires higher standard for the post － construction settlement of the subgrade． In this paper，an embankment U － shaped structure is presented． By using it，the land resource can be saved，the embankment stability can be enhanced and the post － construction settlement of the subgrade can be cut． It can provide the reference to the subgrades of the intercity rail transit and passenger dedicated line built in the plain area with bad geological conditions．
Research conclusions: The load bearing and deformation laws of the embankment U － shaped structure are analyzed to obtain the change law of the stress － strain of the bottom plate and side － wall corresponding to the structure height and thickness． The moments of X axial direction of the bottom plate and side － wall are the control moments． The max moment of bottom plate is on the side － wall，and the max moment of side － wall is on bottom． The embankment U － shaped structure has features of higher whole stability and less deformation and it can control the subgrade deformation effectively．
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