Relying on Datang Thermal railway line project, in view of the uneven settlement of the roadbed caused by the heavy haul railways, this paper selects line in representative section of subgrade soil samples for laboratory dynamic characteristics test, to analyze the dynamic characteristic parameters of the subgrade soil. Based on DDS-70 indoor dynamic triaxial test research, this paper analyzes the dynamic characteristic parameters of representative region of subgrade soil under different dynamic stress amplitude, such as dynamic elastic modulus and dynamic damping ratio, and then puts forward reasonable suggestions for the design and maintenance of the heavy load railway subgrade.%依托大唐热电铁路专线工程，针对专线重载铁路引起的路基的不均匀沉降问题，选取专线典型区段路基土样进行室内动力特性试验，获取专线铁路路基土体动力特性参数进行研究。基于室内DDS-70动三轴试验研究，分析在不同动应力幅值条件下，代表性区域路基土体的动弹性模量以及动阻尼比等动力特性参数的变化规律，进而对重载铁路路基设计与维护提出合理建议。
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