全厚式车辙试验影响因素分析及对半刚性基层沥青路面的车辙预估

发布时间：2018-01-10 22:23

本文关键词：全厚式车辙试验影响因素分析及对半刚性基层沥青路面的车辙预估　出处：《西安建筑科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来由于高温天气持续、交通量增长、超载严重、车辆渠化交通等因素综合影响，沥青路面车辙病害愈发突出，，严重影响行车安全和道路使用寿命。长期以来，国内外道路研究人员对车辙问题进行了大量研究，从纯理论和试验方面分析车辙产生的成因和规律，但效果并不理想，目前我国普遍应用标准车辙试验对车辙进行预估，但与实际情况相差较大。基于此种情况，本文对现有的车辙试验仪器进行改进，使其能更好的模拟实际路面。本文首先进行了动态模量试验，得到多个温度和多个频率下的沥青混合料动态模量试验结果，然后将试验数据进行转化得到能够表征沥青混合料粘弹性性质的参数，然后分析标准车辙试验不足之处，对其进行改进，通过全厚式车辙试验改变温度梯度、轮压分析沥青混合料车辙变化规律。利用有限元软件对车辙试验进行模拟计算，通过试验和模拟进行对比得出有限元模拟计算的合理有效性，用有限元模拟代替部分试验。对全厚式车辙试验进行模拟分析，得出不同温度梯度、不同轮压、不同层间结合状态以及不同厚度下车辙变形情况及剪应力和压应力变化情况，利用应力的变化规律对车辙成因进行进一步分析。对半刚性基层路面和柔性基层路面进行模拟计算，计算结果与全厚式车辙试验进行对比得出结论，即全厚式车辙试验可以较好的对半刚性基层沥青路面进行车辙预估，然后改变混合料的模量、层间状态分析车辙变化情况，提出车辙预防措施。
[Abstract]:In recent years, due to the continuous high temperature weather, traffic volume growth, serious overload, vehicular traffic and other factors, the rutting disease of asphalt pavement is becoming more and more prominent. For a long time, road researchers at home and abroad have done a lot of research on rutting, and analyzed the causes and rules of rutting from pure theory and test. However, the effect is not satisfactory. At present, the standard rut test is widely used in our country to predict the rut, but it is different from the actual situation. Based on this situation, this paper improves the existing rutting test instruments. So that it can better simulate the actual road surface. In this paper, the dynamic modulus test of asphalt mixture is first carried out, and the dynamic modulus test results of asphalt mixture are obtained at several temperatures and different frequencies. Then the test data are transformed to obtain the parameters which can characterize the viscoelastic properties of asphalt mixture. Then the shortcomings of standard rutting test are analyzed and improved to change the temperature gradient through full-thickness rutting test. Wheel pressure analysis of asphalt mixture rutting change law, using finite element software to simulate the rutting test, through the comparison of the test and simulation to obtain the reasonable effectiveness of the finite element simulation calculation. The finite element simulation is used to replace the partial test. The full-thickness rutting test is simulated and analyzed, and the results show that different temperature gradient, different wheel pressure, different interlayer bonding state and different thickness of rutting deformation and shear stress and compressive stress change. The causes of rutting are further analyzed by using the law of stress variation. The results are compared with the full-thickness rutting test by simulating and calculating the semi-rigid base pavement and the flexible base pavement. That is, the full-thickness rutting test can better predict the rut of semi-rigid base asphalt pavement, and then change the modulus of mixture, analyze the rut changes between layers, and put forward the rutting prevention measures.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.217

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