Abstract
In order to study the effects of dry density and initial water content on the permeability characteristics of loess, the saturated permeability tests of undisturbed loess and remolded loess were carried out in Lanzhou New Area. The anisotropy of undisturbed loess under two factors is analyzed and compared, and the permeability difference between undisturbed loess and remolded loess is also analyzed. The results show that the structure of loess has an important impact on the permeability characteristics, and the dry density is an important structural parameter. The natural structure of undisturbed loess has obvious anisotropy. Under different pore conditions and water contents, it will show the anisotropic behavior of permeability. The influence of water content on permeability is mainly reflected in the influence on the properties of cement between soil particle skeletons. Under different dry density conditions, the influence of water content on permeability is different. When the pore structure is relatively compact, the influence of water content is more obvious. In practical engineering, these two factors need to be comprehensively considered in order to accurately describe the permeability distribution of loess. This study can provide some theoretical guidance for the construction of relevant loess projects.
Highlights
Loess is widely distributed in western China, of which Lanzhou belongs to the Loess Plateau, with a large thickness and wide distribution range
When the water content is below 10%, the variation range of soil permeability coefficient is small, while when the initial water content is greater than 10%, the vertical permeability coefficient and horizontal permeability coefficient will rise, which is reflected in IB
Loess has obvious structure and water sensitivity. e pore structure directly determines the relevant hydraulic properties of loess. ere is a close relationship between permeability and loess structure. e dry density and moisture content of the soil are the basic physical parameters of soil
Summary
Loess is widely distributed in western China, of which Lanzhou belongs to the Loess Plateau, with a large thickness and wide distribution range. Loess has strong water sensitivity, which will lead to the change in pore structure after encountering water, resulting in the problems of strength, permeability, and collapsibility. E study of Fu et al [3] shows that the natural soil structure has a significant impact on the compressibility, dilatancy, and shear strength of loess, and the constitutive model of saturated loess based on the test provides a new method for determining the initial degree of structure. E above research results greatly promote people’s understanding of loess structural characteristics and permeability and provide theoretical and technical support for the solution of loess engineering problems. Is paper makes an experimental study on this problem and explores the relationship between natural structure and permeability by studying the permeability of undisturbed loess under different moisture contents and dry densities. The permeability test of the remolded loess is carried out, and the influence laws of initial water content and dry density of the remolded loess on loess permeability are given
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