Numerical simulation of split test process for asphalt mixture under heterogeneous state
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摘要: 为了分析非均质特性对沥青混合料劈裂试验的影响, 应用真实破裂过程分析系统, 全过程模拟了考虑均质度影响的沥青混合料劈裂试验, 并假定沥青混合料强度参数符合Weibull分布, 分析了劈裂过程中应力分布状态和裂纹分布状态, 同时对AC-10沥青混凝土马歇尔试件进行了劈裂试验, 模拟了劈裂破坏过程。结果表明: 裂纹状态随均质度的减小趋向离散, 高均质度的试件劈裂裂纹状态更具有规则; 受非均质基元体随机分布的影响, 试件劈裂过程中的应力分布呈现出多峰值现象; 马歇尔试件的数值试验和物理试验具有相同的劈裂过程。Abstract: In order to analyze the influence of heterogeneity on asphalt mixture split test, a realistic failure process analysis program was used to conduct the numerical simulation of split test. The Weibull distribution of asphalt concrete strength coefficient was assumed in the digital test to study the stress state and cracking process. Marshall split test was conducted on AC-10 specimen, and its split failure process was simulated. Analysis result shows that the cracking state tends to dispersion with the decrease of homogeneous degree, but the cracking state of specimen with high homogeneous degree is more regular. Affected by the stochastic distribution of heterogeneous element, the stress distribution presents multiple peaks in specimen split process. The split process of Marshall specimen in digital test is similar with that in physical test.
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Key words:
- pavement material /
- asphalt mixture /
- digital test /
- split test
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图 4 没有单元损伤时沿竖直直径方向应力分布
Figure 4. Stress distributions along vertical diameter without element in distress
图 5 少数单元损伤时沿竖直直径方向应力分布
Figure 5. Stress distributions along vertical diameter with small number of elements in distress
图 6 没有单元损伤时沿水平直径方向应力分布
Figure 6. Stress distributions along horizontal diameter without element in distress
图 7 少数单元损伤时沿水平直径方向应力分布
Figure 7. Stress distributions along horizontal diameter with small number of elements in distress
图 11 不同均质度劈裂过程关键点
Figure 11. Key points of split test under different homogeneous degrees
表 1 试验参数
Table 1. Test coefficients
力学及控制指标 试样 压条 均质度系数 1.0、1.5、2.0、2.5、3.0、3.5、4.0 1 000.0 弹性模量均值/GPa 1.5 210.0 抗压强度均值/MPa 3 1 000 拉压比 0.1 1.0 泊松比 0.25 0.20 残余强度系数 0.1 1.0 
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表 2 AC-10级配
Table 2. Gradation of AC-10
指标 各筛孔尺寸(mm)通过率/% 0.075 0.15 0.3 0.6 1.18 2.36 4.75 9.5 13.2 级配范围上限 8 16 23 32 44 58 75 100 100 级配范围中值 6 11 16 23 32 44 60 95 100 级配范围下限 4 6 9 13 20 30 45 90 100 设计级配 6.74 8.55 15.47 26.10 33.00 47.00 65.00 100.00 100.00
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