【摘要】 控制城市地下道路隧道洞口与出口匝道的间距对于保证地下道路和地面道路分流位置的行车安全具有重要意义。介绍了城市地下道路隧道洞口与出口匝道最小间距的各组成部分，建立了隧道洞口与出口匝道间距需求模型，计算了单向2、3、4车道城市地下道路隧道洞口与出口匝道最小间距推荐值，分析了隧道洞口与出口匝道小间距段行车安全影响因素，提出了相应的安全保障措施，相关研究成果可为地下道路设计工作提供参考。更多还原

【Abstract】 Controlling the spacing from portal and exit ramp of underground road tunnel is important for ensuring driving safety at diversion location of underground roads and road. Various components of the minimum spacing from tunnel exit to exit ramp were introduced. The spacing requirements model was founded. The minimum spacing recommended value of one-way two lanes, three lanes and four lanes were calculated. The safety factors were analyzed to propose corresponding security measures. The related research results can provide reference for underground road design work.更多还原