铰接列车是我国基础建设中非常重要的特种设备运输工具，其对道路设计的通 行性和安全性提出的要求较高，但目前相关规范未全面考虑铰接列车的安全通行需求，此 类特殊道路的设计指标仍需完善． 文中根据铰接列车的后轮转向原理，结合车辆尺寸和平 曲线要素分析车轮运行轨迹，完善路面加宽值模型;提出在填挖限制时，以路面加宽值为 限制条件的圆曲线半径选取方法，并以道路加宽不足 3m 为例，提出“转向后轮”和“非转 向后轮”两种类型车辆在不同轴距、转角条件下的转弯半径建议值为 20 ～ 80 m;同时，为 保证车辆在转弯过程中道路内外侧的空间安全，提出“车身横净距”、“甩尾容许值”两项 安全性设计指标，分析不同类型车辆对设计指标的需求与差异． 本文研究成果旨在为工程 人员提供准确的设计参考依据，降低道路后期改扩建的成本，提高大型货物的运输安全性．

The articulated train is a very important transportation tool for special equipment in China’s infrastruc- ture construction． It has high requirements for the passability and safety of road design． However，the current specification doesn’t fully consider the safe traffic demand of articulated trains． The design standard of such spe- cial roads needs to be improved． According to the principle of rear wheel steering of the articulated train，and con- sidering the vehicle size and the horizontal curve index，the wheel trajectory was analyzed and the road widening value model was improved． It proposed a method of selecting circular curve radius limited by the road widening value when the filling and excavating conditions are limited． Taking the road widening less than 3 meters as an ex- ample，the method suggested the recommended values of the turning radius of the two types of vehicles “steering rear wheel”and “non-steering rear wheel”under different wheelbase and corner conditions are 20 ～80m． In or- der to ensure the safety of the vehicle in the process of turning and the inside and outside of the road，two safety design indexes，namely “lateral clear distance”and “over-length permissible value”were proposed to analyze the demand and difference types of vehicles． The research results will provide engineers with accurate design refer- ences，reduce the cost of road reconstruction and expansion，and improve the transportation safety of large car- goes．