我国自动闭塞设备统一为ZPW - 2000型移频轨道电路制式,它对道床条件要求较高,干线电缆极限长度为15 km.特长隧道内独特的环境和复杂、不可预测的道床条件以及干线电缆长度一般超过15 km.此时如采用移频轨道电路,难于满足轨道电路和机车信号传输高安全、高可靠的要求,给自动闭塞设备制式的选择提出了严峻挑战,应对这种情况进行研究和探讨.在总结既有特长隧道计轴加环线自动闭塞工程成功经验基础上,阐述进一步研究的主要问题,经理论分析和计算,提出最长干线电缆达到21 km的特长隧道内计轴加环线自动闭塞系统的设计方案和意见,经试验、验证后,指导工程设计.%In our country all automatic-blocking devices are unified as ZPW-2000 type frequency-shift track circuit standard which the requirements on track bed conditions are higher and the limiting length of main-line cable is only 15 km. However, because of the specific environment, complex and unpredictable track conditions of the super long tunnel, the cable lengths of main lines within super long tunnel are often more than 15 km. So it is difficult to meet the requirements of high security, high reliability of track circuits and cab signal transmission, in case of using the frequency shift track circuit for this situation; and it is necessary to study and discuss this situation under the severe challenge of how to choose the automatic-blocking standard. This paper summarizes the successful experiences on automatic-blocking with axle counter plus loop of existed super-long tunnels, and discusses the main issues which need to study further. Finally, by theoretical analysis and calculation, the paper gives the design scheme and suggestions on automatic-blocking of axle counter plus loop within super-long tunnel, in which the longest main-line cable can reach up to 21 km. After experiment and verification, the design scheme and suggestions can guide the engineering design.
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