沥青路面的应力场测试及车辙敏感区分析
发布时间：2019-04-18 10:28
【摘要】：车辙是沥青路面最严重的病害之一,车辙的产生降低了道路的服务水平,严重影响车辆的行车安全,为了更有针对性地防治车辙,提出了沥青路面的车辙敏感区的概念。通过对车辙产生机理的分析发现,车辙敏感区的存在与沥青路面的较大应力场(正应力场和剪应力场)和高温温度场有关,利用二者的组合效应,对车辙敏感区进行分析。论文研究依托在建的高速公路,在路面结构中埋设了压力传感器,实测了路面结构内的应力,结合数据拟合结果,分析了沥青路面的较大应力场;利用现有的实测温度数据,分析了沥青路面的高温温度场;利用有限元软件对不同荷载水平、不同温度下的路面应力场进行了数值计算,分析了沥青路面的剪应力场;结合上述研究结果对车辙敏感区进行分析,并确定了车辙敏感区的深度范围。研究结果表明:沥青路面结构内的正应力随路面深度的增加呈指数形式衰减,满足指数函数σ(h)=p_0 · e~(-h/b)的分布规律;基于实测路面应力场,确定了较大应力场的范围,位于路表面以下36cm的范围内;依据实测温度确定了路面的高温温度场,主要分布在路面深度0～12cm之间l利用有限元软件对路面应力场进行数值计算,受最大剪应力场影响较大的区域集中在5～10cm之间;对较大应力场和高温温度场组合分析,得到高温时路面结构内受压应力影响最大的区域,即路表面下0～8cm范围内,之后结合对面层内最大剪应力的分析结果,对车辙敏感区进行分析,最终确定其深度范围集中在0～10cm之间;提出三种防治车辙的技术方案,即进行交通管制(在特定的时间限制重载车辆通行);相应提高车辙试验的试验温度和荷载条件;复合抗车辙技术。
[Abstract]:Rut is one of the most serious diseases of asphalt pavement. The occurrence of rut reduces the service level of the road and seriously affects the driving safety of vehicles. In order to prevent and control rut more pertinently, the concept of rut sensitive area of asphalt pavement is put forward. Through the analysis of rut formation mechanism, it is found that the existence of rut sensitive zone is related to the larger stress field (positive stress field and shear stress field) and high temperature field of asphalt pavement. In this paper, based on the highway under construction, the pressure sensor is embedded in the pavement structure, the stress in the pavement structure is measured, combined with the data fitting results, the larger stress field of the asphalt pavement is analyzed. The high temperature field of asphalt pavement is analyzed by using the existing measured temperature data, and the stress field of asphalt pavement under different load levels and different temperatures is calculated by finite element software, and the shear stress field of asphalt pavement is analyzed. The rut sensitive area is analyzed and the depth range of the rut sensitive area is determined. The results show that the normal stress in asphalt pavement structure decays exponentially with the increase of pavement depth, which satisfies the distribution law of exponential function 蟽 (h) = p ~ (- h) ~ (- h ~ (- b). Based on the measured road surface stress field, the range of larger stress field is determined, which is within the range of 36cm below the road surface. According to the measured temperature, the high temperature field of the pavement is determined, which is mainly distributed between the pavement depth 0~12cm and the finite element software to calculate the pavement stress field. The area affected by the maximum shear stress field is concentrated between the 5~10cm. Based on the combined analysis of large stress field and high temperature field, the maximum shear stress in the face layer is obtained in the area where the compressive stress is most affected at high temperature, that is, in the range of 0~8cm under the road surface, and then the maximum shear stress in the facing layer is analyzed. The rut sensitive area was analyzed and the depth range was determined to be between 0~10cm. Three technical schemes of rut prevention are put forward, that is, traffic control (restricting the passage of heavy-duty vehicles at a specific time), increasing the test temperature and load conditions of rut test, and compound anti-rut technology.
【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】：U416.217
[Abstract]:Rut is one of the most serious diseases of asphalt pavement. The occurrence of rut reduces the service level of the road and seriously affects the driving safety of vehicles. In order to prevent and control rut more pertinently, the concept of rut sensitive area of asphalt pavement is put forward. Through the analysis of rut formation mechanism, it is found that the existence of rut sensitive zone is related to the larger stress field (positive stress field and shear stress field) and high temperature field of asphalt pavement. In this paper, based on the highway under construction, the pressure sensor is embedded in the pavement structure, the stress in the pavement structure is measured, combined with the data fitting results, the larger stress field of the asphalt pavement is analyzed. The high temperature field of asphalt pavement is analyzed by using the existing measured temperature data, and the stress field of asphalt pavement under different load levels and different temperatures is calculated by finite element software, and the shear stress field of asphalt pavement is analyzed. The rut sensitive area is analyzed and the depth range of the rut sensitive area is determined. The results show that the normal stress in asphalt pavement structure decays exponentially with the increase of pavement depth, which satisfies the distribution law of exponential function 蟽 (h) = p ~ (- h) ~ (- h ~ (- b). Based on the measured road surface stress field, the range of larger stress field is determined, which is within the range of 36cm below the road surface. According to the measured temperature, the high temperature field of the pavement is determined, which is mainly distributed between the pavement depth 0~12cm and the finite element software to calculate the pavement stress field. The area affected by the maximum shear stress field is concentrated between the 5~10cm. Based on the combined analysis of large stress field and high temperature field, the maximum shear stress in the face layer is obtained in the area where the compressive stress is most affected at high temperature, that is, in the range of 0~8cm under the road surface, and then the maximum shear stress in the facing layer is analyzed. The rut sensitive area was analyzed and the depth range was determined to be between 0~10cm. Three technical schemes of rut prevention are put forward, that is, traffic control (restricting the passage of heavy-duty vehicles at a specific time), increasing the test temperature and load conditions of rut test, and compound anti-rut technology.
【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】：U416.217
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