On the influence of the sample preparation method on strain accumulation in sand under high-cyclic loading
On the influence of the sample preparation method on strain accumulation in sand under high-cyclic loading
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DOI：
10.1016/j.soildyn.2019.106028
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发表时间：
2020-04
影响因子：
4
通讯作者：
T. Wichtmann;K. Steller;T. Triantafyllidis
中科院分区：
文献类型：
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作者：
T. Wichtmann;K. Steller;T. Triantafyllidis
研究了高周反复荷载作用下试样制备方法对砂土累积应变的影响。许多排水循环三轴试验与10 - 5个周期进行的样品上制备的空气plurides出的漏斗，空气plurides使用多个筛子装置，水plurides，潮湿的土壤或干燥松散的沉积物与随后的压实振动或攻丝。试验结果表明，样品制备方法对应变积累强度有显著影响。在相同的密度下，湿浸法制备的非常松散的样品比空气浸法制备的样品显示出更大的应变积累速率，而在中等密度和高密度下则相反。通过干燥状态下压实程序制备的样品比直接制备相同相对密度的样品更能抵抗累积效应。应变累积速率的差异是由不同构造方法产生的不同初始组构的结果。基于接触法向分布的微观力学解释。相反，应变积累的方向（循环流动法则）和弹性部分的变形在周期（应变振幅）是相当不敏感的样品制备方法的选择。
A study on the influence of the sample preparation method on the cumulative strains in sand under high-cyclic loading is presented. Numerous drained cyclic triaxial tests with 10 5 cycles were performed on samples prepared by either air pluviation out of a funnel, air pluviation using a multiple sieve apparatus, water pluviation, moist tamping or dry loose deposition with a subsequent compaction by either vibration or tapping. The test results reveal a significant influence of the sample preparation method on the intensity of strain accumulation. While very loose samples prepared by moist tamping show much larger strain accumulation rates than their air-pluviated counterparts at same density, it is the other way around at medium and high densities. Samples prepared by procedures involving compaction in the dry state are more resistant against cumulative effects than samples directly prepared to the same relative density. The differences in the rates of strain accumulation are the result of a different initial fabric generated by the various constitution methods. A micromechanical explanation based on the distribution of contact normal orientations is provided. In contrast, the direction of strain accumulation (cyclic flow rule) and the elastic portion of deformation during the cycles (strain amplitude) are rather insensitive to the choice of the sample preparation method.