山区高速公路分离式断面坡长限制值研究
发布时间：2018-10-29 20:45
【摘要】：改革开放以来,我国道路运输行业用了二十至三十年的时间达到了发达国家三十至四十年的发展水平,实现了跨越式的发展。但我国道路交通存在发展严重不平衡的问题,西部山区由于地形条件的限制,发展状况远远落后于东部沿海地区。大力建设交通基础设施依旧是进一步推进西部大开发战略的首要任务,高速公路网的加密建设迫在眉睫。在西部山区部分地形特别复杂路段,修建高速公路时如果仍然采用整体式断面,势必会造成大填大挖、破坏环境,甚至降低线形指标。针对这种现象,更能适应地形的分离式断面应运而生。采用分离式断面不但能顺应地形减少工程造价、保护环境,还可以提高公路的线形指标。目前国内修建分离式断面遇到长大纵坡时,由于标准中没有明确给出最大坡长的限制值,通常是直接采用整体式断面的坡长限制值,但上坡和下坡对汽车的影响是不一样的,直接采用整体式断面的坡长值也就不合理。因此研究分离式断面长大纵坡坡长限制值,上坡情况和下坡情况应该分开研究,这样更能符合汽车的实际行驶情况。本文以西商高速为数据来源,通过调查分析选取东风EQ5208XXY2型厢式载货汽车为试验车型,对汽车的动力性能和制动性能分别进行研究。根据试验汽车的动力性能,研究上坡路段不限长度的最大纵坡值。分别从上坡时是否考虑风速对汽车的影响、驾驶员是否考虑换挡、汽车的坡顶速度三个方面研究上坡路段的坡长限制值,然后对不同情况下的坡长限制值进行比例修正,最终确定上坡路段的坡长限制值。根据试验汽车的制动性能,研究下坡路段不限长度的最大纵坡值,研究制动鼓温度模型,根据制动鼓温度升高的不同情况,研究下坡路段坡长的限制值。最后根据研究的结果,分别提出高速公路分离式断面上坡路段和下坡路段的坡长限制值。
[Abstract]:Since the reform and opening up, China's road transport industry has spent 20 to 30 years to achieve the developed countries 30 to 40 years of development level, to achieve a leapfrog development. However, there is a serious imbalance in the development of road traffic in our country. Due to the limitation of terrain conditions, the development of the western mountainous areas lags far behind the eastern coastal areas. Construction of traffic infrastructure is still the most important task in the strategy of western development, and the construction of highway network encryption is urgent. In the western mountainous area part of the terrain is especially complex section, if the highway is still using integral section, it will inevitably lead to large excavation, damage to the environment, and even reduce the linear index. In view of this phenomenon, the separated cross section which can adapt to the terrain emerges as the times require. The separated section can not only reduce the engineering cost, protect the environment, but also improve the alignment index of highway. At present, when separate sections are built in our country, the maximum slope length is not clearly given in the standard, so the limit value of slope length of integral section is usually used directly, but the influence of uphill and downhill on automobile is different. It is not reasonable to use the slope length of integral section directly. Therefore, the study on the limit value of the length of the long longitudinal slope of the split cross section, the uphill and downhill conditions should be studied separately, which is more suitable for the actual driving condition of the automobile. Based on the investigation and analysis of Dongfeng EQ5208XXY2 van truck, the dynamic performance and braking performance of the vehicle are studied respectively. According to the dynamic performance of the test vehicle, the maximum longitudinal slope value of the unlimited length of the uphill section is studied. This paper studies the slope length limitation value of uphill road from three aspects: whether the wind speed is taken into account the influence of the wind speed on the vehicle, whether the driver considers the shift and the car slope top speed, and then carries on the proportional revision to the slope length limit value under different conditions. Finally, the limit value of slope length is determined. According to the braking performance of the test vehicle, the maximum longitudinal slope value of the downhill section is studied, the temperature model of the brake drum is studied, and the limit value of the slope length of the downhill section is studied according to the different conditions of increasing the brake drum temperature. Finally, according to the results of the study, the limit values of the slope length of the separated section of expressway are put forward respectively.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U412.3
本文编号：2298775
[Abstract]:Since the reform and opening up, China's road transport industry has spent 20 to 30 years to achieve the developed countries 30 to 40 years of development level, to achieve a leapfrog development. However, there is a serious imbalance in the development of road traffic in our country. Due to the limitation of terrain conditions, the development of the western mountainous areas lags far behind the eastern coastal areas. Construction of traffic infrastructure is still the most important task in the strategy of western development, and the construction of highway network encryption is urgent. In the western mountainous area part of the terrain is especially complex section, if the highway is still using integral section, it will inevitably lead to large excavation, damage to the environment, and even reduce the linear index. In view of this phenomenon, the separated cross section which can adapt to the terrain emerges as the times require. The separated section can not only reduce the engineering cost, protect the environment, but also improve the alignment index of highway. At present, when separate sections are built in our country, the maximum slope length is not clearly given in the standard, so the limit value of slope length of integral section is usually used directly, but the influence of uphill and downhill on automobile is different. It is not reasonable to use the slope length of integral section directly. Therefore, the study on the limit value of the length of the long longitudinal slope of the split cross section, the uphill and downhill conditions should be studied separately, which is more suitable for the actual driving condition of the automobile. Based on the investigation and analysis of Dongfeng EQ5208XXY2 van truck, the dynamic performance and braking performance of the vehicle are studied respectively. According to the dynamic performance of the test vehicle, the maximum longitudinal slope value of the unlimited length of the uphill section is studied. This paper studies the slope length limitation value of uphill road from three aspects: whether the wind speed is taken into account the influence of the wind speed on the vehicle, whether the driver considers the shift and the car slope top speed, and then carries on the proportional revision to the slope length limit value under different conditions. Finally, the limit value of slope length is determined. According to the braking performance of the test vehicle, the maximum longitudinal slope value of the downhill section is studied, the temperature model of the brake drum is studied, and the limit value of the slope length of the downhill section is studied according to the different conditions of increasing the brake drum temperature. Finally, according to the results of the study, the limit values of the slope length of the separated section of expressway are put forward respectively.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U412.3
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