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针对中国特色的半刚性基层沥青路面,在广韶高速公路瓮城段进行为期一个月高温期的现场温度观测。运用三维有限元方法,结合现场实测温度,分析了半刚性沥青路面结构的最大拉应力、最大剪应力和最大路表弯沉在荷载和荷载耦合作用下的变化情况。结果表明,随着路面深度增加,温度波动的幅度逐渐减小;路面内的最高温度相对大气和路表温度滞后约1小时;沥青路面内部温度高于表面温度;大气、路表和路面内部温度变化基本同步,温度波峰与波谷的出现频率相同;在温度和荷载综合作用下,路表以下2cm深度范围内易出现因拉应力不足造成的开裂破坏;路表以下10cm深度范围内,较易出现剪切破坏;高温温度场的存在虽不会明显增大路面结构各层的拉应力与剪应力,但会明显增大路表弯沉,故易产生车辙破坏。
For the semi-rigid grassroots asphalt pavement with Chinese characteristics, a one-month high-temperature on-site temperature observation was conducted on the Ungcheng section of Guangshao Expressway. The maximum tensile stress, the maximum shear stress and the maximum deflection of the road surface under the coupling of load and load were analyzed by using the three-dimensional finite element method combined with the field measured temperature. The results show that with the increase of pavement depth, the amplitude of temperature fluctuation decreases gradually. The maximum temperature in the pavement lags about 1 hour behind the atmospheric and surface temperature. The internal temperature of asphalt pavement is higher than the surface temperature. The atmospheric, The change of temperature is basically the same with the frequency of occurrence of troughs and troughs. Under the combined effect of temperature and load, the cracking damage caused by the insufficient tensile stress is easy to occur within the depth of 2cm below the road surface; Shear failure; Although the existence of high temperature does not significantly increase the pavement structure of the tensile stress and shear stress, but will significantly increase the road surface deflection, it is easy to produce rut damage.