On the “elastic stiffness” in a high-cycle accumulation model — continued investigations
On the “elastic stiffness” in a high-cycle accumulation model — continued investigations
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关于高循环累积模型中的“弹性刚度”——继续研究
DOI：
10.1139/cgj-2013-0037
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发表时间：
2013
影响因子：
3.6
通讯作者：
Triantafyllidis
中科院分区：
文献类型：
--
作者：
Wichtmann;Niemunis;Triantafyllidis
作者提出的高周累积模型可以用来预测由于大量(例如数百万次)具有相对较小应变幅度(<；10−3)的载荷循环而产生的永久变形或应力松弛。预测的应力松弛取决于HCA模型中使用的各向同性“弹性刚度”。将不排水循环试验测得的孔压累积速率与排水循环试验测得的体积应变累积速率进行比较，以标定体积弹性模数K。泊松比ν可以根据在各向异性固结应力和应变循环的不排水试验中测得的应力松弛路径的形状来确定。不幸的是，Wichtmann等人在之前的一篇论文中对中等粗砂的K值进行了校准。2010年受到膜渗透效应的影响。因此，所有进一步的研究都是在膜渗透可以忽略不计的细沙上进行的。本文报道了这一新的结果。新的测试证实了K值对压力的强烈依赖性，以及它对幅度的独立性。此外，新的实验结果表明，K与密度有关，而体弹性模量与应力比无关。此外，首次基于不同幅度、密度和初始应力进行的试验，校准了用于HCA模型的泊松比ν。
The high-cycle accumulation (HCA) model proposed by the authors can be used to predict permanent deformations or stress relaxation due to a large number (e.g., several millions) of load cycles with relative small strain amplitudes (<10−3). The predicted stress relaxation depends on the isotropic “elastic stiffness”,, used in the HCA model. To calibrate the bulk modulus,K, the rate of pore pressure accumulation obtained from an undrained cyclic test and the rate of volumetric strain accumulation measured in a drained cyclic test are compared. Poisson’s ratio,ν, can be determined from the shape of the stress relaxation path measured in an undrained test with anisotropic consolidation stresses and strain cycles. Unfortunately, the calibration ofKshown for a medium coarse sand in a previous paper by Wichtmann et al. in 2010 was affected by membrane penetration effects. Consequently, all further studies have been performed on a fine sand for which membrane penetration is negligible. The present paper reports on the new results. The strong pressure dependence ofKand its independence from amplitude found in the previous study could be confirmed by the new tests. In addition, the new experimental results reveal a density dependence ofK, while the bulk modulus is rather independent of stress ratio. Furthermore, for the first time Poisson’s ratio,ν, used in the HCA model has been calibrated based on tests performed with different amplitudes, densities, and initial stresses.
DOI：
10.1098/rspa.1990.0083
发表时间：
1990-07-09
期刊：
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
影响因子：
--
作者：
GODDARD, JD
通讯作者：
GODDARD, JD
DOI：
10.1061/(asce)0733-9410(1984)110:11(1606
发表时间：
1984-11
期刊：
Journal of Geotechnical Engineering
影响因子：
--
作者：
G. Bouckovalas;R. Whitman;W. Marr
通讯作者：
G. Bouckovalas;R. Whitman;W. Marr
循环荷载引起的土壤长期变形
DOI：
--
发表时间：
2006
期刊：
影响因子：
--
作者：
A. Niemunis;T. Wichtmann;T. Triantafyllidis
通讯作者：
T. Triantafyllidis