Fem validation of a double porosity elastic model for consolidation of structurally complex clayey soils
Fem validation of a double porosity elastic model for consolidation of structurally complex clayey soils
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DOI：
10.1002/(sici)1096-9853(20000410)24:4
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发表时间：
2000-04
影响因子：
4
通讯作者：
C. Callari;F. Federico
中科院分区：
文献类型：
--
作者：
C. Callari;F. Federico
本文对结构性粘性土的室内固结进行了分析。研究采用了两种不同的方法。第一种方法将土视为各向同性均匀等效双孔隙介质。第二种方法依赖于有限元法（FEM）的广泛应用，以不同的土壤组合，构成二维或全三维有序结构化介质，示意性地离散复杂的材料。两个参考问题，代表典型的情况下，一维实验室固结的结构性土壤，被认为是。对于每一个问题，解决方案是通过整合的DP介质的固结方程，以及通过有限元法应用到由不同材料组成的有序计划。通过适当的边界条件，考虑到常规实验装置的存在，以确保样品的排水。有限元计算结果与理论计算结果的比较表明，DP模型能够较好地反映结构复杂土体的固结过程。当两个多孔系统之间的流体交换速率通过过于简化的关系表示时，DP模型的适用性可能会受到限制。计算的结果，得到合理的值分配到细观结构和实验装置参数，指出，部分有效的排水装置强烈影响分布沿着样品和时间演变的间隙水压力作用在两个系统的孔隙。在Rowe的细胞上的人工裂隙粘土样品在文献中报道的固结试验数据进行了比较的分析和数值结果显示出显着的协议。版权所有（C）2000约翰威利父子有限公司。
Laboratory consolidation of structured clayey soils is analysed in this paper. The research is carried out by two different methods. The first one treats the soil as an isotropic homogeneous equivalent Double Porosity (DP) medium. The second method rests on the extensive application of the Finite Element Method (FEM) to combinations of different soils, composing 2D or fully 3D ordered structured media that schematically discretize the complex material. Two reference problems, representing typical situations of 1D laboratory consolidation of structured soils, are considered. For each problem, solution is obtained through integration of the equations governing the consolidation of the DP medium as well as via FEM applied to the ordered schemes composed of different materials. The presence of conventional experimental devices to ensure the drainage of the sample is taken into account through appropriate boundary conditions. Comparison of FEM results with theoretical results clearly points out the ability of the DP model to represent consolidation processes of structurally complex soils. Limits of applicability of the DP model may arise when the rate of fluid exchange between the two porous systems is represented through oversimplified relations. Results of computations, obtained having assigned reasonable values to the meso-structural and to the experimental apparatus parameters, point out that a partially efficient drainage apparatus strongly influences the distribution along the sample and the time evolution of the interstitial water pressure acting in both systems of pores. Data of consolidation tests in a Rowe's cell on samples of artificially fissured clays reported in the literature are compared with the analytical and numerical results showing a significant agreement. Copyright (C) 2000 John Wiley and Sons, Ltd.