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摘要: 以最大程度地模拟现场碾压工况和效果为原则, 测试了室内外振动压实后的水泥稳定碎石干密度和级配, 研究了振动仪的振动参数对半刚性基层材料压实的影响, 提出半刚性基层材料振动试验方法。发现工作频率为30 Hz, 激振力为7.6 kN, 名义振幅为1.2 mm和工作质量为300 kg时振动效果最佳, 振动100 s时的最大干密度与现场干密度相等; 运用振动试验方法确定的最大干密度的准确度平均为100.0%, 振动法成型试件7 d无侧限抗压强度准确度平均为112.6%, 而重型击实试验方法的准确度平均为96.9%, 静压法成型试件7 d无侧限抗压强度准确度平均为42.9%。分析结果表明: 振动试验方法能够更好地模拟基层实际碾压效果, 成型的试件能真实地反映基层材料实际性能。Abstract: Based on simulating the on-the-spot rolling working condition and impact of semi-rigid base course to maximal extent, the dry density and gradation of semi-rigid base course material were tested, the influence of vibration parameters on the compacting effect of semi-rigid base course material was studied, and a vibration test method of semi-rigid base course material was put forward. It is pointed that the optimum vibration parameters of vibration compaction test machine are vibration frequency at 30 Hz, excitation force at 7.6 kN, nominal vibration amplitude at 1.2 mm and vibrator mass at 300 kg, and the maximum dry density by 100 s vibration compaction is equal to the on-the-spot one. On the basis, the average accuracy of the maximum dry density and the average unconfined compressive strength by the method are 100.0% and 112.6%respectively, and they are 96. 9% and 42. 9% respectively by standard heavy compaction test and static compaction test. The result indicates that real base structure can be simulated accurately by the method, and the specimens produced by the method can represent the component structure and performance of on-site semi-rigid base.
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图 4 干密度与名义振幅的关系
Figure 4. Relation between dry density and nominal vibration amplitude
表 1 骨架密实型级配
Table 1. Graded compositions of dense framework structure
表 2 合理振动参数
Table 2. Optimum vibration parameters
表 3 振动时间与压实度关系
Table 3. Relation between vibration times and compactnesses
表 4 成型方法对试件级配的影响
Table 4. Influence of methods of forming sample on gradations of aggregate
表 5 最大干密度测试结果的准确度
Table 5. Test accuracies of maximum dry densities
表 6 无侧限抗压强度测试结果的准确度
Table 6. Test accuracies of unconfined compressive strengthes
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