Abstract
Loess contains many sodium and chloride ions that can easily be leached when seepage occurs, thus affecting the mechanical properties of loess. This study investigated a series of sodium chloride solution concentrations to explore their influence on the permeability of remolded loess, as well as the underlying mechanism of such. The results indicated that the saturated hydraulic conductivity of remolded loess increases with time in response to different sodium chloride concentrations, and the sample was more permeable with increasing concentration. Moreover, the salt effect promoted the dissolution of calcite and dolomite, and the cation exchange stimulated the leaching of other cations, thus leading to further structural loosening. Furthermore, the aggregation of clay particles increased, thus forming a larger pore space among aggregates and providing effective channels for permeation. These findings provide a theoretical basis for an improved understanding of channel degradation in the loess area of Northwest China.
Highlights
Loess is widely distributed throughout the arid and semi-arid regions of the world, accounting for approximately 10% of the global land area [1,2]
It can be seen that the Ksat of the remolded loess samples with a dry density of 1.45 g·cm−3 increased withtime time during the entire process of permeation
The results indicated that the hydraulic conductivity of the saturated remolded loess loess was sensitive to concentrations the concentrations of the average valuesofoftheir their was sensitive to the of the thethe average values
Summary
Loess is widely distributed throughout the arid and semi-arid regions of the world, accounting for approximately 10% of the global land area [1,2]. Loess has become a popular foundation of various engineering constructions because of its characteristics of simple development and low cost. Seepage is an important reason for the decline of loess’s engineering properties [3]. In the loess area of Northwest China, a large number of structures, such as loess dams and loess canals, have changed the soil structure. The reasons for this are a series of soil and water interactions in the process of seepage that threaten the safe operation of these structures [4]. It is of great significance to investigate the permeability behavior of remolded loess in response to soil and water interactions
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