山区干线公路回头曲线技术指标及安全保障措施研究
发布时间：2018-12-25 12:10
【摘要】：公路设置回头曲线是当路线受到地形高差的限制,路线无法依靠自然展线延长距离克服高差,或利用自然展线将付出巨大的经济、安全及环境代价时所采取的一种平面线形形式,并广泛运用于设计速度较低的公路线形设计中。随着社会经济的发展,干线公路向山区纵深延伸,设计理念也在不断进步。当采用自然展线无法克服控制点间高差时,因设置回头曲线比采用螺旋展线具有更好的经济性及更有效地利用地形条件的潜力,开始受到设计人员的重视。但山区干线公路设置回头曲线仍处于探索阶段,在山区干线公路如何设置回头曲线、把握技术指标、保障行车安全,仍需要进行深入研究。从平面线形、设计速度、平曲线转角等要素,对山区干线公路回头曲线进行了界定,并归纳其形式与线形组成;从设置回头曲线的地形条件、保障行车安全、工程经济性、环境保护及通行能力等方面,提出了山区干线公路设置回头曲线的影响因素。确定了实际行驶速度作为山区干线公路回头曲线的设计速度;基于回头曲线的线形组成及汽车横向稳定性,并将主、辅曲线分开考虑,分别给出了圆曲线最小半径取值;基于大型车的动力性能给出了回头曲线的最大纵坡取值;通过研究回头曲线路段的标准横断面组合形式,结合回头曲线的特点和汽车特性,给出了回头曲线的路面加宽值及最大超高率取值;提出了回头曲线路段对视距的要求;通过对相邻回头曲线间过渡段的界定,并通过对驾驶员在回头曲线路段的驾驶操作行为的分析,得到了相邻回头曲线间过渡段最小长度取值。通过Trucksim仿真软件建立回头曲线的道路模型,选取行驶速度、侧向加速度、行驶轨迹线、轮胎垂直反力及方向盘转角角速度峰值等指标,对山区干线公路回头曲线技术指标的安全性进行了验证。借鉴国内外关于山区干线公路的安全保障措施的研究成果,结合回头曲线的线形特征及设置方法,从设置限速标志牌、路肩隆声带、线形诱导标、加强护栏、交通标志、避险车道,提升路面摩擦系数等方面提出了回头曲线的安全保障措施。
[Abstract]:The setting back curve of highway is when the route is limited by the height difference of the terrain, the route can't rely on the natural line to extend the distance to overcome the height difference, or the use of the natural line will pay a great deal of money. It is widely used in the design of highway alignment with low speed. With the development of social economy, the trunk highway extends to the mountain area, and the design idea is progressing. When the height difference between the control points can not be overcome by using the natural line, the retrograde curve is more economical than the spiral curve and the potential of making more effective use of the terrain conditions, so the designers begin to pay more attention to it. However, the retrograde curve of mountain trunk highway is still in the exploration stage. How to set up the back curve, grasp the technical index and guarantee the safety of driving still need to be deeply studied in the mountain trunk highway. The paper defines the turning back curve of mountain trunk highway from the elements of plane alignment, design speed, flat curve angle and so on, and induces its form and linear composition. From the aspects of setting up the terrain condition of turning back curve, ensuring the safety of driving, engineering economy, environmental protection and traffic capacity, this paper puts forward the influence factors of setting back curve of mountain trunk highway. The actual driving speed is determined as the design speed of the turning back curve of the mountain trunk highway, based on the linear composition of the turning curve and the lateral stability of the vehicle, the minimum radius of the circle curve is given respectively by considering the main and auxiliary curves separately. The maximum longitudinal slope value of the return curve is given based on the dynamic performance of the large vehicle. By studying the standard cross section combination form of the back curve section, combining the characteristics of the back curve and the characteristics of the vehicle, the road widening value and the maximum ultra high rate value of the back curve section are given, and the requirements of the turning back curve section on the sight distance are put forward. Through the definition of the transition section between the adjacent turning back curves and the analysis of the driver's driving operation behavior in the section of the turning back curve, the minimum length of the transition section between the adjacent turning back curves is obtained. The road model of turning back curve is established by Trucksim software. The parameters such as driving speed, lateral acceleration, track line, tire vertical reaction force and angular velocity peak of steering wheel are selected. The safety of the technical index of turning back curve of mountain trunk highway is verified. Referring to the research results of safety and security measures of mountain trunk highway at home and abroad, combining with the linear characteristics and setting methods of the back curve, from setting up the speed limit sign, the road shoulder rising vocal cord, the linear guiding sign, strengthening the guardrail, the traffic sign, The safety measures of turning back curve are put forward in the aspects of avoiding lane and raising the friction coefficient of road surface.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U412.34
本文编号：2391097
[Abstract]:The setting back curve of highway is when the route is limited by the height difference of the terrain, the route can't rely on the natural line to extend the distance to overcome the height difference, or the use of the natural line will pay a great deal of money. It is widely used in the design of highway alignment with low speed. With the development of social economy, the trunk highway extends to the mountain area, and the design idea is progressing. When the height difference between the control points can not be overcome by using the natural line, the retrograde curve is more economical than the spiral curve and the potential of making more effective use of the terrain conditions, so the designers begin to pay more attention to it. However, the retrograde curve of mountain trunk highway is still in the exploration stage. How to set up the back curve, grasp the technical index and guarantee the safety of driving still need to be deeply studied in the mountain trunk highway. The paper defines the turning back curve of mountain trunk highway from the elements of plane alignment, design speed, flat curve angle and so on, and induces its form and linear composition. From the aspects of setting up the terrain condition of turning back curve, ensuring the safety of driving, engineering economy, environmental protection and traffic capacity, this paper puts forward the influence factors of setting back curve of mountain trunk highway. The actual driving speed is determined as the design speed of the turning back curve of the mountain trunk highway, based on the linear composition of the turning curve and the lateral stability of the vehicle, the minimum radius of the circle curve is given respectively by considering the main and auxiliary curves separately. The maximum longitudinal slope value of the return curve is given based on the dynamic performance of the large vehicle. By studying the standard cross section combination form of the back curve section, combining the characteristics of the back curve and the characteristics of the vehicle, the road widening value and the maximum ultra high rate value of the back curve section are given, and the requirements of the turning back curve section on the sight distance are put forward. Through the definition of the transition section between the adjacent turning back curves and the analysis of the driver's driving operation behavior in the section of the turning back curve, the minimum length of the transition section between the adjacent turning back curves is obtained. The road model of turning back curve is established by Trucksim software. The parameters such as driving speed, lateral acceleration, track line, tire vertical reaction force and angular velocity peak of steering wheel are selected. The safety of the technical index of turning back curve of mountain trunk highway is verified. Referring to the research results of safety and security measures of mountain trunk highway at home and abroad, combining with the linear characteristics and setting methods of the back curve, from setting up the speed limit sign, the road shoulder rising vocal cord, the linear guiding sign, strengthening the guardrail, the traffic sign, The safety measures of turning back curve are put forward in the aspects of avoiding lane and raising the friction coefficient of road surface.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U412.34
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