Analytical solution for one-dimensional consolidation of clayey soils with a threshold gradient

Analytical solution for one-dimensional consolidation of clayey soils with a threshold gradient
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具有阈值梯度的一维粘土固结解析解

DOI:
10.1016/j.compgeo.2010.02.001
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发表时间:
2010-06
影响因子:
5.3
通讯作者:
--
中科院分区:
工程技术2区
文献类型:
--
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本文给出了考虑启动梯度的一维固结问题的一般近似解析解。对一种特殊情况,将本文的解与已有的数值解进行了比较,结果表明本文所采用的方法是合理的。试验结果表明,渗流动边界是逐渐下移的;阈值梯度越大,边界移动越慢。超静孔压在固结结束时不会完全消散,且门槛梯度越大,残余超静孔压越大。考虑由沉降定义的门槛梯度时的平均固结度与考虑孔隙水压力定义的门槛梯度时的平均固结度不同。此外,门槛梯度越大,以应变表示的平均固结度越大,而以应力表示的平均固结度越小。加载时间越长,动边界到达土层底部的时间越长,平均固结度越大。
General approximate analytical solutions are developed for one-dimensional consolidation with consideration of the threshold gradient under a time-dependent loading. A comparison is made between the present solution and some available numerical solutions for a particular case, and the results show that the approach employed in this article is reasonable. The influence of the threshold gradient and the loading period on consolidation behaviour is investigated, and the results show that the moving boundary of seepage moves downward gradually. The greater the threshold gradient is, the slower the boundary moves. The excess pore pressure will not be completely dissipated at the end of consolidation, and the larger the threshold gradient is, the greater the residual excess pore pressure is. The average degree of consolidation considering the threshold gradient defined by settlement is different from that defined by pore pressure. Moreover, the greater the threshold gradient is, the larger the average degree of consolidation in terms of strain, whereas the smaller the average degree of consolidation in terms of stress. It is also shown that the longer the loading period is, the longer the time moving boundary takes to reach the bottom of the layer, and the greater the average degree of consolidation is.
DOI: 10.1520/stp34623s
发表时间: 1986
期刊: ASTM special technical publications
影响因子: --
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