高速公路互通立交技术指标研究

发布时间：2018-07-24 14:16

【摘要】：现今高速公路互通立交的设计大多刻板套用规范规定,对实际环境特点考虑不够充分,在线形指标选用上缺乏灵活性,这就造成了,汽车行驶安全性不足、互通周围环境严重破坏、互通建设费用增加等不良后果。通过分析互通立交技术指标对互通用地、造价及安全性和舒适性的影响,论证了合理使用指标并且推荐一套合理的高速公路互通立交技术指标,作为互通立交灵活设计的参考是十分必要的。对全国部分已建高速公路互通立交指标的使用现状调研分析,了解指标使用现状,指出其存在的问题,提出解决这些问题需要做到合理确定互通立交类型和设计速度并进行安全性评价。在调研的基础上对部分匝道运用速度协调性评价理论进行评价,总结匝道主要技术指标的取值与速度协调性的关系,结合理论分析和主要技术指标使用现状,推荐出高速公路互通立交匝道平曲线最小半径、缓和曲线最小参数、最大纵坡、变速车道长度的推荐值,为互通灵活设计提供参考。本文得出的结论主要有以下几点:(1)匝道线形指标是影响立交用地、造价的关键性因素;匝道本身低限值指标不合理运用会影响立交安全性和舒适性。(2)半径变化对小客车匝道速度协调性的影响要比大货车大,为保证小客车运行的稳定性,应尽量避免圆曲线半径超标的情况出现,并且规范中一般值相对保守,应适当增大。(3)缓和曲线参数的变化对小客车在匝道上速度协调性影响要比大货车大,圆曲线最小半径对车辆在匝道上速度协调性的影响要比缓和曲线参数大。(4)纵坡对于大货车的影响很大,对于出口匝道上坡和入口匝道下坡,增大纵坡会导致大货车的运行速度受到影响,应慎重考虑增加出口匝道上坡和入口匝道下坡的最大纵坡指标值,以防止安全隐患的存在(5)变速车道长度的取值按照规范中单一的长度设计是不合理的,应综合考虑各级匝道设计速度、运行速度和交通量的影响,推荐出一套适合的取值。
[Abstract]:Nowadays, the design of freeway interchange is mostly regulated by the stereotype code, which does not fully consider the characteristics of the actual environment and lacks flexibility in the selection of linear index. This has resulted in the lack of safety in driving of the vehicle. Serious damage to the surrounding environment, mutual construction costs increase and other adverse consequences. By analyzing the influence of the technical index of interchange on the intercommunication land, cost, safety and comfort, this paper demonstrates the reasonable use index and recommends a set of reasonable technical indexes for expressway interchange. As a flexible design of interchange reference is very necessary. Based on the investigation and analysis of the present situation of the use of the index of the interchange of some of the built highways across the country, the present situation of the use of the index is understood, and the existing problems are pointed out. To solve these problems, it is necessary to reasonably determine the type and design speed of interchange and evaluate the safety. On the basis of investigation and research, this paper evaluates some ramps using the theory of speed coordination evaluation, summarizes the relationship between the main technical indicators of ramp and the coordination of speed, and combines the theoretical analysis and the current situation of using the main technical indicators. The recommended values of minimum radius of ramp level curve, minimum parameter of transition curve, maximum longitudinal slope and length of variable speed lane of expressway interchange are recommended, which provides a reference for flexible design of interchange. The main conclusions of this paper are as follows: (1) ramp alignment index is the key factor to influence the cost of interchange land; The unreasonable use of the low limit index of the ramp itself will affect the safety and comfort of the interchange. (2) the influence of the change of radius on the speed coordination of the on-ramp of the passenger car is greater than that of the large freight car, in order to ensure the stability of the passenger car, The radius of circular curve should be avoided as far as possible, and the general value of the specification should be relatively conservative and should be increased appropriately. (3) the change of the parameters of the detent curve has a greater effect on the speed coordination of the passenger car on the ramp than on the large truck. The minimum radius of the circular curve has a greater effect on the speed coordination of the vehicle on the ramp than on the relaxation curve. (4) the longitudinal slope has a great effect on the large truck, and for the upper slope of the exit ramp and the downhill slope of the on-ramp, Increasing the longitudinal slope will affect the running speed of the large truck, so we should carefully consider increasing the maximum longitudinal slope index value of the upper slope and the downhill slope of the exit ramp. In order to prevent the existence of the hidden danger of safety (5) it is unreasonable to design the length of the variable speed lane according to the single length in the specification. It is necessary to consider the influence of the design speed, the running speed and the traffic volume of all levels of ramp comprehensively, and recommend a set of suitable values.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U412.352.1

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