A modified creep index and its application to viscoplastic modelling of soft clays
A modified creep index and its application to viscoplastic modelling of soft clays
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DOI：
10.1631/jzus.a1300331
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发表时间：
2014-04
期刊：
影响因子：
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通讯作者：
Qi-yin Zhu;Ze-xiang Wu;Yan-ling Li;Changjie Xu;Jian-Hua Wang;X. Xia
中科院分区：
文献类型：
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作者：
Qi-yin Zhu;Ze-xiang Wu;Yan-ling Li;Changjie Xu;Jian-Hua Wang;X. Xia
传统的固结试验表明，软粘土的蠕变指标Cαe随密度的增加而减小。根据试验结果，在双对数平面lge-lgt上，提出了一个修正的蠕变指数C*αe，并将C*αe假定为一个常数。然后，修改后的蠕变指数被施加到一个新开发的弹粘塑性模型。这样，修正的蠕变指标C*αe可以自然地考虑反映土体密度对蠕变的影响的非线性Cαe，而不需要额外的参数。最后，增强模型被纳入有限元程序ABAQUS和模拟固结试验和试验路堤。通过比较使用常规蠕变指数Cαe的模拟，强调了改进的蠕变指数对模拟的改善。
Conventional consolidation tests on reconstituted specimens of numerous natural soft clays show a decreasing of creep index Cαe with increasing soil density. Based on all selected and conducted experimental results, a modified creep index C*αe defined in double logarithmic plane lge-lgt, was plotted for various clays, from which C*αe can be assumed as a constant for different soil densities. Then, the modified creep index was applied to a newly developed elastic viscoplastic model. In this way, the modified creep index C*αe can naturally take into account the nonlinear Cαe revealing the influence of soil density in the soil assemblies without additional parameters. Finally, the enhanced model was incorporated into the finite element code ABAQUS and used to simulate a consolidation test and a test embankment. The improvement of simulations by the modified creep index was highlighted by comparing simulations using the conventional creep index Cαe.