Abstract: Firstly, K36+480 filling subgrade was selected; secondly, the influence of train load, compaction coefficient of filling layer, the elastic modulus of filling layer or substratum on the uneven settlement was simulated and analyzed by FLAC 3D software and the simplified three-dimensional model. The results show that: the settlement difference between the center and the edge of the subgrade is increased under train load, which causes uneven subgrade surface and even uneven settlement; the settlement trends of the subgrade with different compaction coefficients are approximately similar, and with the increase of compaction coefficients, the stability and robustness of the subgrade also increases; the difference of elastic modulus of filling layer or substratum (loess) causes the uneven settlement, when it reaches a certain value, it has a little influence on the subgrade settlement.

Key words: railway engineering, heavy haul railway, filling subgrade, uneven settlement, numerical simulation, influential factor

摘要： 以大准铁路项目为依托，选取K36+480处填方路基，基于有限差分软件FLAC 3D软件，采用三维简化模型，讨论了列车荷载、填土压实系数、路基填土层或下卧层弹性模量对路基不均匀沉降的影响。结果表明：列车荷载作用使得路基中心处和边缘处之间的沉降差加大，进而导致路基表面不平整，产生不均匀沉降；不同压实系数路基填土沉降趋势大致相同，路基的稳定性和坚固性随压实系数的增大而增加；路基填土层或下卧层（黄土）弹性模量差异会引起路基的不均匀沉降，当其达到一定值时，对路基沉降影响不大。

关键词: 铁道工程, 重载铁路, 填方路基, 不均匀沉降, 数值模拟, 影响因素