减振型双块式无砟轨道合理刚度匹配研究

摘要

In order to study reasonable stiffness matching for vibration-reduction double-block ballastless track of intercity railway,depending on coupling dynamics theory for wheel-rail system and combining with operation characteristics of intercity railway in our country,the model analyzing coupling dynamics of such track is established to analyze the wheel rail dynamic response to train running thereon at 200 km/h and 160 km/h.The result shows that,for intercity PDL on which train may run at speed up to 200 km/h,the allowable vertical displacement of steel rail is recommended to be controlled within 2 mm and that of the damping pad within about 1 mm; support reaction and track displacement are affected by fasteners' rigidity greatly and the damping pad's stiffness is a key factor defining base plate's acceleration and slab's displacement; and when train stop at certain large station at 200 km/h or at every station at speed up to 160 km/h,the reasonable stiffness of the fasteners may be 42 ～49 kN/mm and that of the damping pad be 0.036 ～0.044 N/mm3.%为研究城际铁路减振型双块式无砟轨道的合理刚度匹配,基于轮轨系统耦合动力学理论,结合我国城际铁路的运营特点,建立了城际铁路车辆-减振型双块式无砟轨道耦合动力分析模型,分析了列车在时速200 km和160 km时的轮轨动力响应.结果表明:对列车最高运行速度为200km/h的城际客运专线,建议钢轨允许垂向位移控制在2mm以内,减振垫的垂向位移应控制在1 mm左右；支点反力、钢轨位移受扣件刚度的影响显著,减振垫刚度是决定底座板加速度及道床板位移的决定性因素.城际铁路“在大站停”列车时速200 km、“站站停”列车最高时速160 km时,扣件合理刚度可取为42～49 kN/mm,减振垫的合理刚度可取为0.036～0.044 N/mm3.