VALIDATION AND CALIBRATION OF A HIGH-CYCLE ACCUMULATION MODEL BASED ON CYCLIC TRIAXIAL TESTS ON EIGHT SANDS
VALIDATION AND CALIBRATION OF A HIGH-CYCLE ACCUMULATION MODEL BASED ON CYCLIC TRIAXIAL TESTS ON EIGHT SANDS
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DOI：
10.3208/sandf.49.711
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发表时间：
2009-10
影响因子：
3.7
通讯作者：
T. Wichtmann;A. Niemunis;T. Triantafyllidis
中科院分区：
文献类型：
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作者：
T. Wichtmann;A. Niemunis;T. Triantafyllidis
Niemunis等人（2005）提出的高循环堆积（HCA）模型预测了由于相对较小的振幅（例如<10-3，即所谓的高或多循环加载）的多次循环（N - > - 103）导致的非粘性土壤的永久变形。本文论证了HCA模型对不同砂体的适用性。为此，在平均粒径为0.15 mm≤d50≤4.4 mm、均匀系数为1.3≤Uc≤4.5的8种不同的石英砂上进行了约200次、每次105次的三轴试验。对每种砂进行了应力幅值、初始相对密度、平均平均压力pav和平均应力比ηav=qav/pav变化的试验系列。讨论了晶粒尺寸分布曲线对应变积累速率的影响。并将实测数据与HCA模型（不同材料常数）的预测结果进行了比较。讨论了材料常数与指数或颗粒性能的关系。这些关联对于确定一组材料常数的简化程序可能是有用的。
The high-cycle accumulation (HCA) model proposed by Niemunis et al. (2005) predicts permanent deformations in non-cohesive soils due to many cycles (N>103) with relatively small amplitudes (eampl<10-3, so-called high- or polycyclic loading). This paper demonstrates the applicability of the HCA model to different sands. For this purpose, approximately 200 triaxial tests with 105 cycles each have been performed on eight different quartz sands with mean grain sizes in the range of 0.15 mm≤d50≤4.4 mm and coefficients of uniformity in the range of 1.3≤Uc≤4.5. For each sand, test series with a variation of stress amplitude, initial relative density, average mean pressure pav and average stress ratio ηav=qav/pav have been conducted. The influence of the grain size distribution curve on the rate of strain accumulation is discussed. A comparison of the measured data with predictions made by the HCA model (with different material constants) is given. Correlations of the material constants with index or granulometric properties are discussed. The correlations may be useful for a simplified procedure to determine a set of material constants.