城市地下互通立交通行能力计算

Traffic Capacity Calculation for Urban Underground Interchange

摘要:

提出了基于期望车头时距的通行能力模型。根据城市地下互通立交特点，计算城市地下互通立交主线路段通行能力、匝道路段通行能力、匝道合流区及分流区通行能力，并给出推荐值。最后，通过实测数据验证了该模型的正确性。结果表明：地下互通立交各部分通行能力均比地上互通立交有所折减，主线路段折减8%~11%（高速区间折减均接近10%），匝道路段折减约14%，匝道合流区折减约10%，匝道分流区折减约11%。

关键词:通行能力;城市地下互通立交;车头时距;主线路段;匝道路段;匝道合流区;匝道分流区

Abstract:

The traffic capacity model based on expected headway time was established. According to the characteristics of urban underground interchange， the traffic capacity of main road， ramp section， merge area and diverge area in urban underground interchange was calculated， and the recommended values were given. Finally， the accuracy of the model was verified by the measured data. Study results show that， the traffic capacity of each underground interchange is reduced compared with that of ground interchange. The main road is reduced by 8%?11% （near 10% on high-speed section）， the ramp section is reduced by 14%， the ramp merge area is reduced by 10%， and the ramp diverge area is reduced by 11%.

Key words:traffic capacity;urban underground interchange;headway time;main road;ramp section;ramp merge area;ramp diverge area