超多车道高速公路复杂立交交织区安全性及优化方法研究

Research on Safety and Optimization Methods of Complex Interchange Weaving Areas in Extra-Multi-Lane Expressways

摘要: 针对十车道及以上超多车道高速公路改扩建工程，小间距互通立交交织段安全风险突出，但现行规范缺乏针对性指导的问题，研究了该类复杂立交交织区的安全特性及设计方法。依托广东省深汕西高速公路改扩建工程，通过理论计算、实际交通观测及VISSIM仿真分析；结合工程实际交通量、车型比例及现场标定的仿真参数，研究了不同交通条件、车道组合与交织长度下的交通行为。通过分析交织区长度与交通量、交织比例的关联性，发现主线二级服务水平下辅助车道连接的交织区推荐最小长度需达600 m；对于十车道高速公路，当主线服务水平降至二级以下时，辅助车道数量应增加至2条，且需对交织区长度进行专项验算；针对双向十二车道及以上高速公路，采用集散车道连接时，集散车道的设置数量不应少于2条。

Abstract: Aiming at the reconstruction and expansion projects of extra-multi-lane expressways with ten or more lanes, the safety risks of weaving sections of interchanges with small spacing are prominent, but the current specifications lack targeted guidance. This study focuses on the safety characteristics and design methods of such complex interchange weaving areas. Based on the reconstruction and expansion project of Shenshan West Expressway in Guangdong Province, theoretical calculations, actual traffic observations and VISSIM simulation analysis are carried out. Combined with the actual traffic volume, vehicle type ratio and field-calibrated simulation parameters of the project, the traffic behaviors under different traffic conditions, lane combinations and weaving lengths are studied. By analyzing the correlation between weaving area length, traffic volume and weaving ratio, it is found that the minimum length of the weaving area connected by auxiliary lanes should reach 600 m under the secondary service level of the main line. For ten-lane expressways, when the service level of the main line drops below the secondary level, the number of auxiliary lanes should be increased to 2, and a special check on the length of the weaving area is required. For expressways with twelve or more bidirectional lanes, when using collector-distributor lanes for connection, the number of collector-distributor lanes should not be less than 2.