车辆动载作用下长大上坡沥青路面力学响应研究

发布时间：2018-04-17 06:00

本文选题：车辆动载荷 + 长大上坡路段　；参考：《长安大学》2014年博士论文

【摘要】：长大上坡路段沥青路面在车辆载荷作用下易出现病害和损坏。随着公路交通向中西部丘陵山区的迅猛发展，势必出现较多的长大上坡段沥青路面。同时重载车辆的超载、环境温度和沥青混凝土路面的设计方法、选材施工工艺等因素导致长大上坡沥青路面的力学行为极为复杂。本文对重载车辆作用下的长大上坡沥青路面的力学行为进行研究。基于汽车动力学原理，建立了上坡路段车辆对路面动作用力系列分析模型，以此模型和对长大上坡路段车辆参数、路面情况调查为基础，建立了二轴货车在长大上坡路段动作用力分析计算模型。选用代表车型，利用MATLAB软件对上坡车辆的动作用力进行了数值仿真。分析了道路坡度、坡长、车辆载重量和入坡速度对动作用力的影响。采用有限元方法，对长大上坡沥青路面分别建立了车辆载荷作用下的弹性有限元模型和粘弹性动载有限元模型。选取力学响应指标，对两种模型分别分析计算了路面结构的力学响应的分布规律。分别通过弹性和粘弹性两种模型，研究了道路坡度、环境温度、车辆载重、路面厚度和路面模量对力学响应指标的影响规律。研制了用于沥青路面动态应变检测的三向应变传感器，在ABAQUS中建立传感器与沥青路面的相互作用的力学模型，分析了道路中埋入传感器对路面应变场的影响。制定了利用此传感器进行长大上坡路段动力学响应的试验方案，并进行现场实测试验。通过试验数据的处理，得到了动力学响应关于坡长和载重的变化规律。比较了试验结果、相应的弹性和粘弹性仿真结果的差异，验证了动态粘弹性模型能更准确的模拟实际道路的力学行为。由于路面层间剪切应力是引起半刚性沥青路面破坏的主要原因之一，本文对长大上坡段沥青路面结构进行了现场层间剪切强度试验，研制了可以实现垂向加载的层间剪切强度测试仪，利用该仪器，通过室内试验对现场测试得到的无垂向载荷的剪切强度结果进行了修正，得到了不同超载率的层间剪切强度，，并对路面剪切强度的可靠度进行了分析。利用流变学模型分析了不同工况下路面结构的层间剪应力，然后同相应工况下路面结构的剪切强度进行对比分析，得到了不同可靠度下的长大上坡沥青路面的层间抗剪性能。
[Abstract]:Asphalt pavement in long and high slope section is prone to damage and disease under vehicle load.With the rapid development of highway traffic to the hills and mountains of the central and western regions, there are bound to be more asphalt pavements in the long uphill section.At the same time, the overloading of heavy duty vehicles, the design method of environment temperature and asphalt concrete pavement, the construction technology of material selection and other factors lead to the extremely complex mechanical behavior of the asphalt pavement on the long slope.In this paper, the mechanical behavior of long uphill asphalt pavement under the action of heavy duty vehicle is studied.Based on the principle of automobile dynamics, a series of analysis model of vehicle action force on road surface in uphill section is established, which is based on the model and the investigation of vehicle parameters and road conditions in long uphill sections.A calculation model for the force analysis of two-axle freight cars on long uphill sections is established.The action force of uphill vehicle is simulated by MATLAB software.The effects of road slope, slope length, vehicle deadweight and descent speed on the action force are analyzed.The elastic finite element model and the viscoelastic dynamic finite element model of the long uphill asphalt pavement under vehicle load are established by using the finite element method.The distribution law of mechanical response of pavement structure is analyzed and calculated by selecting mechanical response index.The effects of road slope, ambient temperature, vehicle load, pavement thickness and pavement modulus on the mechanical response index were studied by means of elastic and viscoelastic models.A three-dimensional strain sensor for dynamic strain detection of asphalt pavement is developed. The mechanical model of the interaction between the sensor and asphalt pavement is established in ABAQUS. The influence of embedded sensors on the pavement strain field is analyzed.An experimental scheme for dynamic response of long up-slope section with this sensor is established, and the field test is carried out.By processing the experimental data, the variation of dynamic response on slope length and load is obtained.By comparing the experimental results and the difference between the corresponding elastic and viscoelastic simulation results, it is verified that the dynamic viscoelastic model can more accurately simulate the mechanical behavior of the actual road.Because the shear stress between the pavement layers is one of the main causes of the failure of the semi-rigid asphalt pavement, the field shear strength test of the asphalt pavement structure in the long and high slope section is carried out in this paper.An interlaminar shear strength tester which can realize vertical loading is developed. By using this instrument, the shear strength results without vertical load obtained by field tests are corrected, and the interlaminar shear strength with different overloading rates is obtained.The reliability of pavement shear strength is analyzed.The interlayer shear stress of pavement structure under different working conditions is analyzed by using rheological model, and then the shear strength of pavement structure under different working conditions is compared and analyzed, and the interlayer shearing performance of long uphill asphalt pavement with different reliability is obtained.
【学位授予单位】：长安大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U416.217

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