西部地区高速公路平均纵坡的研究

发布时间：2018-03-21 04:54

本文选题：戈壁荒漠区及山岭区　切入点：平均纵坡　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：我国幅员辽阔，地势总体为西高东低，呈三级阶梯分布。东部地区地形平坦，主要以平原区和丘陵区为主；西部地区地形复杂多样，受风力、雨水、气温等气候条件及人工影响，形成多种地貌形态，有起伏的山岭区、低缓的盆地区、农业绿洲区、广阔的草原区、贫瘠的戈壁荒漠区和严寒的高原牧区等。不同的地貌形态给西部地区高速公路建设带来不同的环境条件，公路的纵坡设计参数随环境条件的变化应采用不同的指标值。现行公路设计规范给出了各级公路在不同设计速度下的最大纵坡值、高原纵坡折减值，仅对二级及以下等级公路平均纵坡指标进行了说明，并且没有与地形地貌结合，对高速公路设计缺乏指导意义。因此，西部地区不同地貌形态下高速公路平均纵坡的研究对西部地区高速公路建设具有较大的应用价值。本文以新疆（哈密至伊宁）为研究对象，地貌形态主要是戈壁荒漠区及山岭区，调查分析区域范围的自然地理、气候特征、人口经济及交通特性等环境因素，并以乌奎高速公路及相关公路的交通量、交通组成、事故资料为基础，结合未来车型发展趋势，选择具有代表性的东风EQ5208XXY2型厢式载货车为试验车型。对车辆进行动力性能与制动性能分析，确定试验车型的相关技术参数。基于本文研究的地形形态，主要从长大上坡路段通行能力及长大下坡路段交通安全性两方面进行研究，通过VISSIM软件对上坡路段通行能力进行交通仿真，对试验车辆进行室外路段试验分析下坡路段交通安全性，，采集大量数据资料，采用回归分析法建立无辅助制动条件下货车主制动器温度随坡度、坡长变化的预测模型。结合车辆在下坡路段交通安全性和上坡路段通行能力，综合考虑，合理确定无辅助制动条件下西部戈壁荒漠区及山岭区高速公路平均纵坡与坡长的限制指标值，并提出戈壁荒漠区及山岭区高速公路平均纵坡设计标准的选用原则，对公路安全的处置措施也提出合理化建议。
[Abstract]:Our country has a vast territory, the terrain is generally high in the west and low in the east, with a three-tier ladder distribution. The eastern region is flat, mainly in plain areas and hilly areas; the western region is complex and diverse, subject to wind, Rain Water, Climate conditions such as temperature and artificial influence form various landforms, including undulating mountain areas, low and gentle basin areas, agricultural oasis areas, and vast grasslands, The barren Gobi desert area and the frigid plateau pastoral area, etc. Different landforms bring different environmental conditions to highway construction in the western region, The design parameters of longitudinal slope of highway should adopt different index values with the change of environmental conditions. The current highway design code gives the maximum longitudinal slope value of highway at different design speeds and the value of plateau slope break down. The average longitudinal slope index of the second grade and lower grade highway is only explained, and it is not combined with the topography and geomorphology, which is lack of guiding significance to the highway design. The study on the average longitudinal slope of expressway in different geomorphological forms in western China has great application value to highway construction in western region. In this paper, Xinjiang (Hami to Yining) is taken as the research object. The geomorphology is mainly Gobi desert area and mountain area. The environmental factors, such as natural geography, climatic characteristics, population, economy and traffic characteristics, are investigated and analyzed in this paper. And on the basis of the traffic volume, traffic composition, accident data of Wukui Expressway and related highways, and combined with the development trend of future models, The typical Dongfeng EQ5208XXY2 van is selected as the experimental vehicle. The dynamic and braking performance of the vehicle is analyzed, and the relevant technical parameters of the test vehicle are determined. Based on the terrain shape studied in this paper, In this paper, the traffic capacity of long uphill section and traffic safety of long downhill section are studied, and the traffic simulation of uphill section capacity is carried out by VISSIM software. The traffic safety of downhill section was analyzed by outdoor road test, and a large number of data were collected. The main brake temperature of freight car without auxiliary braking was established by regression analysis method, and the temperature of main brake of freight car with slope was established under the condition of no auxiliary braking. The prediction model of slope length variation. Combined with the traffic safety and the capacity of the uphill section of the vehicle in the downhill section, the comprehensive consideration, The limit index values of the average longitudinal slope and slope length of the expressway in the west Gobi desert region and the mountain area without auxiliary braking are reasonably determined, and the selection principles of the design standard for the average longitudinal slope of the highway in the Gobi desert area and the mountain area are put forward. The disposal measures of highway safety also put forward rationalization suggestion.
【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】：U412.3

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