基于非线性渗流的大变形固结有限元分析

发布时间：2018-06-12 11:51

本文选题：大变形 + 非Darcy渗流　；参考：《哈尔滨工程大学学报》2017年08期

【摘要】：为了研究土体在非线性渗流下的固结效应,基于大变形固结理论,考虑非线性渗流(耦合非Darcy渗流与变渗透系数)作用,建立了二维固结控制方程与有限元方程。采用自编程序对某一黏性土体的固结过程进行了计算。通过大量变动参数的计算与分析,探讨了非Darcy渗流与渗透系数随固结变化的影响。计算结果表明:与Darcy渗流相比,非Darcy渗流下的沉降小,超孔压消散缓慢,具有延迟效应。其中,非Darcy渗流试验常数m影响较大,线性渗流起始水力梯度iL影响较小。渗透系数变化对固结的影响与非Darcy渗流相似,压缩指数与渗透系数指数比值αc的影响较大。在非Darcy渗流与渗透系数随固结变化的耦合作用下,沉降显著减小,超孔压消散趋于缓慢,延迟效应更为明显。
[Abstract]:In order to study the consolidation effect of soil under nonlinear seepage, based on the consolidation theory of large deformation, considering the effect of nonlinear seepage (coupled non-Darcy seepage and variable permeability coefficient), a two-dimensional consolidation control equation and a finite element equation are established. The consolidation process of a certain clay soil is calculated by using self-compiled program. Through the calculation and analysis of a large number of variable parameters, the influence of non-Darcy seepage flow and permeability coefficient on consolidation is discussed. The results show that compared with Darcy seepage, the settlement of non-Darcy seepage is smaller, the excess pore pressure dissipates slowly and has the effect of delay. Among them, the influence of non-Darcy seepage test constant m is great, and the influence of linear initial hydraulic gradient iL is small. The effect of the change of permeability coefficient on consolidation is similar to that of non-Darcy seepage, and the ratio of compression index to permeability index 伪 c has a great influence on consolidation. Under the coupling of non-Darcy percolation and permeability coefficient with consolidation, the settlement decreases significantly, the superpore pressure dissipates slowly, and the delay effect becomes more obvious.
【作者单位】：西京学院土木工程学院;大连理工大学建设工程学部土木工程学院岩土工程研究所;大连理工大学海岸和近海工程国家重点实验室;同济大学地下建筑与工程系;
【基金】：国家自然科学基金项目(41572252)
【分类号】：TU43

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