Vertical and horizontal permeability measurements in organic soils

E. Malinowska, A. Szymański
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引用次数: 2

Abstract

Abstract The paper is referring to vertical and horizontal laboratory permeability measurements in soft organic soils. The estimation of anisotropic permeability in soft organic soils, as peats, requires to use a special apparatus and the knowledge of proper analysis of the test results. During loading the void ratio decreases substantially that causes the changeability of the permeability. The change of permeability during the compression is very important because of the influence of the consolidation co-efficient. Initial strain in soft organic soils appears very quickly, just after loading, and brings immediately the decrease of permeability. In most of the estimations, it is assumed that during the consolidation process the water flows just in the vertical direction. In soft organic soils, like peats, the consolidation theory should consider the changes of mechanical and physical properties in consolidation period, in both directions. The direct measurement of vertical and horizontal permeability of organic soil and the non-Darcian flow theory may be of considerable importance in estimating pore water pressure dissipation, and settlement rates in the consolidation model. In the paper, the method of investigation and the test results of the vertical and horizontal permeability are presented. The Modified Rowe Cell Set for obtaining consolidation and flow characteristics in different directions is used.
有机土壤垂直和水平渗透率测量
摘要本文介绍了软质有机土的纵向和横向室内渗透率测量方法。估计泥炭等软质有机土的各向异性渗透率,需要使用特殊的仪器和对试验结果进行适当分析的知识。在加载过程中,孔隙率大幅降低,导致渗透率的变化。由于固结系数的影响,压缩过程中渗透系数的变化非常重要。软质有机土的初始应变在加载后很快出现,并立即引起渗透性的降低。在大多数估计中,假设在固结过程中水只沿垂直方向流动。在泥炭等软质有机土中,固结理论应考虑固结过程中力学性质和物理性质两个方向的变化。直接测量有机土的垂直和水平渗透性以及非达西流动理论对于估计固结模型中的孔隙水压力耗散和沉降速率可能具有相当重要的意义。本文介绍了垂向渗透率和水平渗透率的调查方法和测试结果。采用修正Rowe单元集计算不同方向的固结和流动特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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