轨底坡作为道岔的主要参数，直接影响钢轨使用寿命，结合30 t轴重重载道岔研究需要，对轨底坡进行系统研究。针对重载线路道岔鱼鳞纹、掉块、肥边等病害，运用车辆轨道耦合动力学理论，对25 t轴重货车通过不同轨底坡道岔时的动力响应进行分析。结果表明：轨底坡增加，横向轮轨力、接触应力和安全指标，导曲线上股钢轨磨耗功都有不同程度的降低，长期观测结果显示，采用1：20轨道坡的试验道岔，导曲线钢轨光带居中，未见伤损。%Rail cant affects rail life directly as an important design parameter of turnout and rail cant is studied systematically to meet research need of heavy turnout of 30 t axle load. Dynamic responses of 25t axle load freight car passing turnouts with different rail cants are analyzed with vehicle-track coupling dynamics theory in perspective of fine corner crack, fall-block, fat edge and other defects. The research results show that lateral wheel-rail force, contact stress, safety indicators and wear power for outside guiding curve rail decrease with the increase of rail cant. The long-term observation indicates that the test turnout with 1 : 20 rail cant has its light band in the middle of upper surface of the guiding curve rail without damage.
展开▼
