高速铁路中,动力作用下路基结构的强度疲劳特性和变形是影响路基工后沉降和地基加固作用的主要因素.在考虑列车类型、行车速度等影响因素的基础上,从轨道的不平顺要求出发,建立满足无砟轨道铺设精度要求的列车激振荷载,模拟列车动荷载下桩-板结构加固后路基的动力响应.数值模拟结果表明,考虑轨道不平顺性的列车动荷载对路基体的影响集中在一定深度和宽度范围内,动荷载作用下经桩-板结构加固后的路基工后沉降值满足规范要求.%In subgrade structure of high-speed railway, the fatigue strength and the deformation under the action of dynamic force are the major factors which affect the post-construction settlement magnitude and the subsoil strengthening effect. According to the train type, train speed and other influence factors, and considering the characteristics of track irregularity, the article establishes the train shock excitation loads which could meet the accuracy requirements of paving the ballastless track, and simulates the dynamic response of the subgrade after being strengthened by sheet-pile structure under the action of dynamic train load. The numerical simulation results show that when considering the track irregularity, the effect on the subgrade structure by dynamic train load has a concentrating distribution just within a certain depth and width, and then the post-construction settlement values of the subgrade after being strengthened by sheet-pile structure under the action of dynamic train load could meet the requirements of the relevant engineering codes.
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