地下环路交织区合理长度计算方法
Calculation Method for the Reasonable Length of Underground Ring Road Weaving Segment
曹煜 1王永岗1
作者信息
- 1. 长安大学运输工程学院,西安 710018
- 折叠
摘要
为优化地下环路设计,本文从通行能力着手,结合交通仿真分析,对地下环路交织区长度进行研究.首先,基于多个影响因素构建了计算方法,并对各参数进行了标定;接着,通过Vissim仿真软件和间接安全评价模型(SSAM)对所建方法进行了检验;最后给出了一般情况下地下环路交织区长度的建议值.结果表明:仿真与计算方法所得结果误差小于4.2％,证明了所建方法的有效性;对比原项目和所建方法所得设计,后者交通冲突率降低73.2％,证明所建方法得到的交织区长度更为合理;建设地下环路后,车辆行程时间最高缩短了39.6％,延误情况缩短至2 s内,排队长度最大缩短了88.1 m,表明运用所建方法建设地下环路具有较高可行性.依据所建方法进行交织区长度设计能够提高地下环路交通安全水平,缓解城市核心区的拥堵情况.
Abstract
The development of underground ring roads has become a new initiative to relieve traffic pressure in the urban core.In order to optimize the design of the underground ring road,the reasonable length of the weaving segment was studied with capacity and traffic simulation analysis.Firstly,considering several influencing factors,the calculation method for the length of underground ring road weaving segment was constructed,and each parameter was calibrated.Secondly,taking the underground ring road in the T5 station business district of Airport New City of Xi Xian New Area as an example,the results of Vissim simulation before and after the construction of underground ring road were compared,as well as the traffic conflicts between the original project design and the design obtained by the proposed method through Surrogate Safety Assessment Model(SSAM).Finally,the recommended value of the length of underground ring road weaving segment under general conditions was given.The results show that:a)the length obtained by the calculation method has a small error(less than 4.2％)with the simulation results,which proves that the proposed method could calculate the length efficiently;b)compared with the original design,the traffic conflict rate is reduced by 73.2％,which testifies that the length obtained by the method is more reasonable;c)with the construction of the underground ring road,the travel time is reduced by 39.6％maximum,the delay is shortened to within 2 s,and the maximum decrease of queue length is 88.1 m,which indicates that the construction of the underground ring road could improve the level of service using the calculation method.The design based on the proposed method can improve the traffic safety of the underground ring road and reduce the congestion in the urban core.
关键词
交通工程/地下环路/交织区通行能力/交织区长度/交通仿真Key words
traffic engineering/underground ring road/the capacity of weaving segment/the length of weaving segment/traffic simulation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据