基于PFC3D的高速有砟道床沉降研究

Research on Settlement of High-speed Ballast Bed Based on PFC3D

以高速有砟道床为研究对象,基于离散元法,利用颗粒流程序软件PFC3D从行车速度、累积次数和密实度3个方面探究了在列车循环载荷作用下有砟道床的沉降规律。分析结果表明:随着行车速度的不断提高,有砟道床的累积沉降量明显增大;当循环累积次数超过加载次数的临界点时,道床沉降的速率会减小;有砟道床的密实度较大时,其累积沉降量较小。

Take the high-speed ballast bed as the research object.Based on the discrete element method,the particle flow program software PFC3D is used to explore the settlement law of the ballast bed under the action of the train’s cyclic load from the three aspects of traveling speed,cumulative times and compactness.The analysis results show that with the continuous increase of the driving speed,the cumulative settlement of the ballast bed increases significantly;when the cumulative number of cycles exceeds the critical point of the loading times,the settlement rate of the ballast bed will decrease;the compactness of the ballast bed is higher.When it is large,its cumulative settlement is small.