互通式立交范围内主线主要技术指标研究

发布时间：2018-01-13 16:09

本文关键词：互通式立交范围内主线主要技术指标研究　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：互通式立交主线作为互通式立交的“躯干”部分，，其平、纵面技术指标选取的合理与否关系到互通式立交整体的安全性与工程经济性。虽然我国《公路路线设计规范中》（JTG D20-2006）对互通式立交范围内主线主要技术指标作了明确的规定，但并没有就相关技术指标的取值依据做出详细的说明，并且国内也很少有研究人员对其进行研究。在设计中，设计人员对互通式立交主线指标的选取比较随意，导致平、纵线形指标不尽合理，不能满足分、合流车辆行驶安全和工程经济性要求。因此，对互通式立交主线技术指标的研究，成为互通式立交领域一个亟需解决的问题。论文首先通过对目前国内外已有研究成果进行分析，提出了互通式立交范围内主线圆曲线、竖曲线以及纵坡等技术指标选取的限制因素，主要包括车辆行驶的安全性和舒适性、驾驶员对互通式立交出口的识别视距以及互通式立交的整体性等。然后通过分析驾驶员对互通式立交分流鼻处地面标线的识别以及制动过程，计算得出了驾驶员对立交出口的识别视距值，并结合圆曲线半径和竖曲线半径的几何计算模型，提出了不同设计速度时基于识别视距的互通式立交主线平、竖曲线半径推荐值。最后，针对互通式立交出口主线为下坡和入口主线为上坡这两种行车安全不利的情况，利用加、减速车道长度计算模型，结合纵坡对主导车型加速度和减速度的影响，分别计算主线不同纵坡时主导车型到达出口分流鼻和入口汇流点的运行速度，并与安全运行速度相比较，提出互通式立交主线范围内纵坡的推荐值。研究结论为互通式立交主线平、纵指标的选取提供了理论依据，对互通式立交的设计人员具有重要的指导意义。
[Abstract]:As the "trunk" part of the interchange, the main line of the interchange is flat. Whether the technical index of longitudinal plane is reasonable or not is related to the overall safety and engineering economy of the interchange. Although JTG D20-2006 is in the Design Code of Highway Route in China). The main technical indexes of the main line in the scope of the interchange are clearly stipulated. However, there is no detailed explanation on the value basis of relevant technical indicators, and there are few domestic researchers to study it. In the design, the designers choose the main line index of interchange more casually. As a result, the horizontal and longitudinal alignment index is not reasonable and can not meet the requirements of safety and engineering economy of the combined flow vehicle. Therefore, the study on the technical index of the main line of interchange. It has become an urgent problem in the field of interchange. Firstly, through the analysis of the existing research results at home and abroad, the paper puts forward the main line circle curve, vertical curve and vertical slope in the interchanges. Mainly includes the vehicle driving safety and comfort. The identification distance of the driver to the exit of the interchange and the integrity of the interchange. Then the identification and braking process of the driver on the ground mark at the diverging nose of the interchange are analyzed. The recognition horizon value of the driver to the exit of the interchange is calculated. Combined with the geometric calculation model of the radius of circular curve and vertical curve, the main line level of interchange based on the recognition distance of sight is put forward at different design speeds. The vertical curve radius is recommended. Finally, aiming at the situation that the main line of interchange exit is downhill and the main line of entrance is uphill, the calculation model of lane length of acceleration and deceleration is used. Combined with the influence of longitudinal slope on acceleration and deceleration of the main vehicle, the speed of the leading vehicle to the outlet shunt nose and the inlet confluence point is calculated respectively when the main line is different in the longitudinal slope, and compared with the safe running speed. The recommended value of longitudinal slope in the main line of interchange is put forward. The conclusion provides a theoretical basis for the selection of the main line and longitudinal index of the interchange, and is of great significance to the designers of the interchange.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U412.352.1

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