朔黄铁路小半径曲线无缝线路稳定性及安全储备量研究

CWR Stability and Safety Reserve of Sharp Curve on Shuo-Huang Railway

随轴重的增加,重载列车作用于轨道的荷载明显增加,在温度力和列车动载荷作用下,小半径曲线无缝线路产生"弹动"失稳。结合30t轴重条件下朔黄铁路无缝线路的稳定性问题,采用不等波长无缝线路稳定性计算方法,研究朔黄铁路小半径曲线无缝线路的稳定性以及不同强化措施下无缝线路的安全储备量。结果表明:在大轴重货车运行条件下,半径为400m的曲线无缝线路的最大温升已超过允许温升,其稳定性已无法满足要求;半径为450和500m的曲线无缝线路实际的安全储备量也明显降低;采用轨枕加密、更换重载轨枕和扣件的强化措施,可明显提高小半径曲线无缝线路稳定性;对于半径为400m的曲线无缝线路采用更换重载轨枕的强化措施后,在考虑制动温升为10℃条件下,其安全系数提高至1.43,即其稳定性得到明显增强。

With the increase of axle load,the load of heavy haul train acting on track will increase significantly.Under the temperature force and dynamic train load,＂bouncing＂instability will occur on the CWR of sharp curve.In allusion to the stability problem of CWR on Shuo-Huang Railway under 30 taxle load,the method of unequal wavelength for calculating CWR stability was adopted to study the CWR stability of sharp curve on Shuo-Huang Railway and the safety reserve for CWR with different strengthening methods.Results show that the maximum temperature rise of CWR on R=400mcurve has exceeded the allowable temperature rise,and the stability is unable to meet the requirements under the operating conditions of heavy axle load freight car.The actual safety reserve for CWR on R=450mcurve and R=500mcurve has been significantly decreased.The CWR stability of sharp curve can be significantly improved by different strengthening methods,such as,increasing the number of sleepers,replacing heavy haul sleepers and fasteners.After the strengthening method of replacing heavy haul sleepers being adopted,the stability of CWR on R=400mcurve can be enhanced obviously and its safety factor can reach 1.43 under the condition of the brake temperature rise of 10 ℃.