为探究大粒径骨料心墙沥青混凝土的离析特性，开展了室内试验和现场试验。首先，对室内配制的沥青混凝土试样的密度比数据进行极差分析；其次，基于一元方差理论对现场不同工况下钻取的骨料最大粒径37.5 mm的沥青混凝土芯样上、下部的密度数据进行了统计分析；最后，对不同工况下大粒径骨料心墙沥青混凝土芯样上、下部的基本力学性能进行了对比分析。结果表明：对心墙沥青混凝土离析影响相对较大的因素是骨料最大粒径，其次是试验温度，最小的是沥青用量，且心墙沥青混凝土离析的倾向性随骨料粒径增大、沥青用量增大和试验温度升高而增大。不同工况下成型的骨料最大粒径37.5 mm的沥青混凝土的离析倾向性由大到小分别是：工况二初碾温度145 ℃、摊铺厚度30 cm，工况一初碾温度130 ℃、摊铺厚度30 cm，工况三初碾温度145 ℃、摊铺厚度40 cm和工况四初碾温度130 ℃、摊铺厚度40 cm；其自身的离析倾向性会随着摊铺厚度的增大、初碾温度的降低而减小。上述4种工况下成型的骨料最大粒径37.5mm的沥青混凝土的芯样上、下部的马歇尔稳定度、马歇尔流值和劈裂抗拉强度的差异均在6%以内，均匀性良好。

In order to investigate the segregation characteristics of asphalt concrete with large size core walls, indoor and field tests were conducted. Firstly, the density ratio data of the indoor prepared asphalt concrete specimens were analyzed by extreme variance analysis. Secondly, the density data of the upper and lower parts of the asphalt concrete core samples with the maximum aggregate size of 37.5 mm drilled under different working conditions in the field were statistically analyzed based on the one-dimensional variance theory. Finally, the basic mechanical properties of the upper and lower parts of the asphalt concrete cores of the large-grain-size aggregate core wall were comparatively analyzed under different working conditions. The results show that the relatively large influence on the segregation of asphalt concrete in the heart wall is the largest aggregate size, followed by the test temperature, the smallest is the amount of asphalt, and the tendency of segregation of asphalt concrete in the heart wall increases with the increase of the aggregate size, the increase of asphalt dosage and the increase of the test temperature. The tendency of segregation of asphalt concrete with the largest aggregate size of 37.5 mm molded under different working conditions from large to small are: initial milling temperature of 145 ℃ with paving thickness of 30 cm, initial milling temperature of 130 ℃ with paving thickness of 30 cm, initial milling temperature of 145 ℃ with paving thickness of 40 cm and initial milling temperature of 130 ℃ with paving thickness of 40cm, respectively. The tendency of segregation of its own will be increased with the increase of the thickness, initial milling temperature and asphalt consumption, and with the increase of test temperature and asphalt consumption. The tendency of segregation will decrease with the increase of paving thickness and the decrease of initial milling temperature. The differences in Marshall stability, Marshall flow value and split tensile strength between the upper and lower parts of the core samples of asphalt concrete with the largest aggregate size of 37.5 mm molded under the above four working conditions are all within 6%, with good uniformity.