道路线形对双车道公路通行能力的影响研究  

Influence of road alignments on two-lane highway capacity

作　　者：刘江[1] 魏中华[2] 

机构地区：[1]河南省交通厅,河南郑州450052 [2]北京工业大学北京市交通工程重点实验室,北京100022

出　　处：《土木工程学报》2007年第7期87-92,共6页China Civil Engineering Journal

基　　金：交通部西部建设科技项目(200331822309)

摘　　要：双车道公路在选线时,由于平、纵线形指标选取的范围较大,它们之间的组合导致了双车道公路线形差异较大,通行能力也不尽相同。因此,平纵线形是影响双车道公路通行能力的主要因素。根据实测数据和已有研究,认为半径大于400m的平曲线和坡度小于3%的纵坡不影响道路的通行能力。定义有效曲度和有效梯度2个概念来分别表示平曲线的弯曲程度和竖曲线的陡峭程度,给出计算方法,并探讨其有关性质。根据仿真结果和速度差原则分别将有效曲度和有效梯度分为了7级和6级,将有效曲度和有效梯度进行组合,构造出42组不同道路线形下的双车道公路,在进行的仿真实验中,得到了相应的小客车速度-流量、流量-跟车率关系,最终得出不同道路线形条件下的双车道公路通行能力值。Two-lane highway is the most general form of highways in a road network. Because horizontal and vertical line indexes can be chosen within a relatively large range, the combination of them causes variable road alignments and different capacities. The road alignment is one of the main influencing factors on highway capacity. According to the field data analysis and the existing findings, it does not affect the capacity when the radius is greater than 400m or the slope is less than 3%. Two new indexes are defined： effective curvature and effective gradient, and calculation methods are also provided. Effective curvature and effective gradient are divided into 7 and 6 levels, respectively, according to the simulation results and the principle of speed difference. Using the simulation method, the speedvolume curve and the volume-following ratio relationship are obtained for 42 different road alignments.

关 键 词：双车道公路 道路线形 通行能力 仿真 交通工程 

分 类 号：U491.254[交通运输工程—交通运输规划与管理]