摘要
为了确定城市地下互通左出匝道分流区减速车道长度的合理区间,研究减速车道长度与主线、匝道的交通量和设计速度的交互作用对左出分流区交通冲突的影响,该文以武汉市两湖隧道工程地下互通立交为例,开展VISSIM微观交通仿真试验,并提取冲突率(R_(CR))和碰撞暴露时间(T_(TET))指标进行分析。结果显示:(1)随着减速车道长度增加,分流区冲突率减小而T_(TET)增大;(2)随着主线交通量或匝道交通量的增大,分流区冲突率未呈现显著变化,而T_(TET)有不同程度的增大;(3)随着主线设计速度的增大或匝道设计速度的减小,分流区冲突率和TTET均呈现增大的趋势;(4)方差分析和多重比较表明,减速车道长度是引起冲突率和TTET变化的关键原因,且综合来看地下互通立交左出匝道分流区减速车道长度的一般合理区间应设置为120~170 m,考虑工程经济性最大长度宜控制在195 m以内。
To set a reasonable range of the length of the deceleration lane in the diverge area of the left off‑ramp for urban underground interchanges,the effects of the length of the deceleration lane,as well as interactions between traffic volumes and design speeds of mainline and ramp on traffic conflict in the diverge area,were examined.By taking the underground interchange of the Wuhan East‑South Lakes Tunnel Project as an example,the VISSIM micro traffic simulation test was carried out,and the conflict rate(R_(CR))and exposed time to collision(T_(TET))were extracted.The results show that①when the length of the deceleration lane increases,the conflict rate decreases,and the T_(TET) increases in the diverge area;②when the traffic volumes of the mainline or ramp increase,no significant changes were observed in the conflict rate of the diverge area,while the T_(TET) increases to varying degrees;③when the design speed of the mainline increases,or the design speed of the ramp reduces,both the conflict rate and the TTET of the diverge area increase;④Analysis of variance and multiple comparisons indicate that the length of the deceleration lane plays a critical role in the variations of conflict rate and TTET,and 120~170 m is generally recommended to be a reasonable length of the deceleration lane in the diverge area of the left off‑ramp for underground interchanges.The maximum length should be controlled within 195 m considering the economic value of the project.
作者
王海亮
程冲
官洪
丁乃侃
WANG Hailiang;CHENG Chong;GUAN Hong;DING Naikan(Wuhan Urban Railway Construction Investment&Development Co.,Ltd.,Wuhan 430061,China;Second Highway Consultant Company Ltd.,CCCC,Wuhan 430056,China;School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan,Hubei 430074,China;Intelligent Transportation Systems Research Center,Wuhan University of Technology,Wuhan,Hubei 430063,China)
出处
《中外公路》
2024年第1期209-217,共9页
Journal of China & Foreign Highway
基金
国家自然科学基金资助项目(编号:71901166)。
