Fatigue performances of semi-rigid base course materials
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摘要: 采用振动法制作了4种半刚性基层材料不同结构类型的梁试件, 应用MTS试验机进行了疲劳性能试验, 利用Weibull分布函数对疲劳试验结果进行回归分析, 建立了不同材料不同结构试件的室内疲劳寿命预估模型, 分析了半刚性基层材料的结构类型和弯拉强度对疲劳寿命的影响。分析结果表明: 不同半刚性基层材料疲劳方程的回归系数a、b有差别。水泥稳定类材料的疲劳方程除骨架空隙结构类型外均较接近, 回归系数a为0.969~1.110, 回归系数b为-0.073~-0.096。二灰稳定类材料的疲劳方程的回归系数a为1.129~1.173, 回归系数b为-0.079~-0.083。0.70应力水平下水泥稳定碎石骨架密实结构的疲劳寿命对数为3.602, 悬浮密实结构的为3.118, 因此, 骨架密实结构的抗疲劳性能优于悬浮密实结构。0.70应力水平下二灰稳定碎石的疲劳寿命对数为5.006, 水泥稳定类材料的疲劳寿命对数最大为3.724, 因此, 前者的抗疲劳性能优于后者。Abstract: Four kinds of beam specimens with different structural types for four semi-rigid base materials were made by using vibration compaction method.The fatigue performance test of semi-rigid base materials was carried out by utilizing material test system(MTS).The results of the test were recursively analyzed by using Weibull's probability distribution function.A series of fatigue prediction models were set up.The effects of the structural types and flexural strengthes of semi-rigid base materials on their fatigue lives were studied.Analysis result shows that the recursive coefficients a and b of the models for the materials are different.The models of cement stabilized base course materials are tiny difference except framework-pore structure, and the scopes of a and b are respectively 0.969~1.110 and-0.073~-0.096.The scopes of a and b of lime-fly ash stabilized base course materials are respectively 1.129~1.173 and-0.079~-0.083.The logarithmic fatigue lives of framework-dense structure and suspend-dense structure are respectively 3.602 and 3.118 at 0.70 stress level, so the fatigue performance of the former is better than that of the latter.The logarithmic fatigue life of lime-fly ash stabilized macadam is 5.006 at 0.70 stress level, but the maximum value of cement stabilized base course material is 3.724, so the fatigue performance of the former is better than that of the latter.8 tabs, 11 refs.
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表 3 水泥稳定基层材料疲劳试验结果
Table 3. Fatigue test result of cement stabilized base course materials
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表 6 不同弯拉强度的半刚性基层材料的疲劳寿命
Table 6. Fatigue lives of semi-rigid base course materials under different flexural strengthes
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表 8 正态分布下的疲劳方程回归系数
Table 8. Regression coefficients of fatigue equations under normal distributions
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